# TrueTools.org

> 270+ free online calculators and tools for business, finance, health, development, and everyday life. No sign-up required. All tools run client-side in the browser — your data never leaves your device.

## About

TrueTools.org is a free tool suite with 270+ instant-use calculators and utilities across 12 categories. Every tool works offline, requires no account, and produces results instantly. Built with pure HTML, CSS, and vanilla JavaScript.

## Categories

### Business (19 tools)
- [Profit Margin Calculator](https://truetools.org/tools/profit-margin): Gross & net margin from revenue & cost
- [ROI Calculator](https://truetools.org/tools/roi-calculator): Return on investment estimator
- [Break-Even Calculator](https://truetools.org/tools/break-even): Find when your business turns profit
- [Employee Cost Calculator USA](https://truetools.org/tools/employee-cost-calculator-usa): True cost of hiring in the US
- [Free Invoice Generator](https://truetools.org/tools/invoice-generator): Create and download PDF invoices
- [Free Resume Builder](https://truetools.org/tools/resume-builder): Build and export a professional resume
- [Business Name Generator](https://truetools.org/tools/business-name-generator): Startup & company name ideas
- [Margin vs Markup Guide](https://truetools.org/guides/margin-vs-markup): Profit margin vs markup explained
- [Chart Maker](https://truetools.org/tools/chart-maker): Create bar, line, pie & donut charts
- [Meeting Cost Calculator](https://truetools.org/tools/meeting-cost-calculator): Real-time meeting cost timer
- [E-commerce Profit Calculator](https://truetools.org/tools/ecommerce-profit-calculator): True profit after all platform fees
- [Markup Calculator](https://truetools.org/tools/markup-calculator): Markup vs margin calculator
- [TikTok Money Calculator](https://truetools.org/tools/tiktok-money-calculator): Estimate TikTok creator earnings
- [UK VAT Calculator](https://truetools.org/tools/vat-calculator-uk): Add or remove VAT at 20%, 5% or 0%
- [Australian GST Calculator](https://truetools.org/tools/gst-calculator-australia): Add or remove 10% GST for invoicing and BAS
- [Canada GST/HST Calculator](https://truetools.org/tools/gst-hst-calculator-canada): Add or remove GST/HST/PST by province — all 13 provinces
- [US Tariff Calculator](https://truetools.org/tools/tariff-calculator-usa): US import duty calculator — Section 301/232/122 rates by country & category
- [Bonus Depreciation Calculator 2026](https://truetools.org/tools/bonus-depreciation-calculator-usa-2026): OBBBA 100% bonus depreciation for equipment & assets
- [R&D Expensing Calculator 2026](https://truetools.org/tools/rd-expensing-calculator-usa-2026): Compare immediate R&D expensing vs 5-year amortization under OBBBA

### Finance (89 tools, +56 variants)
- [Currency Converter](https://truetools.org/tools/currency-converter): Convert 160+ currencies with live rates
- [Compound Interest Calculator](https://truetools.org/tools/compound-interest): Watch your savings grow over time
- [Mortgage Calculator USA](https://truetools.org/tools/mortgage-calculator-usa): Monthly payments & amortization
- [Loan Calculator](https://truetools.org/tools/loan-calculator): Auto, personal & student loan payments
- [Salary Calculator USA 2026](https://truetools.org/tools/salary-calculator-usa-2026): Take-home pay after 2026 US taxes
- [Tax Bracket Calculator USA 2026](https://truetools.org/tools/tax-bracket-usa-2026): 2026 US federal income tax estimator
- [Net Worth Calculator](https://truetools.org/tools/net-worth): Track your total net worth
- [Roth vs Traditional IRA Guide](https://truetools.org/guides/roth-vs-traditional-ira): Roth vs Traditional IRA comparison 2026
- [Fixed vs Variable Mortgage](https://truetools.org/guides/fixed-vs-variable-mortgage): Fixed vs adjustable rate mortgage guide
- [Discount Calculator](https://truetools.org/tools/discount-calculator): Calculate sale prices & savings
- [Retirement Calculator](https://truetools.org/tools/retirement-calculator): Plan your retirement savings
- [Paycheck Calculator USA 2026](https://truetools.org/tools/paycheck-calculator-usa-2026): Net pay after 2026 US taxes
- [Debt Payoff Calculator](https://truetools.org/tools/debt-payoff): Avalanche & snowball payoff plans
- [Snowball vs Avalanche Guide](https://truetools.org/guides/snowball-vs-avalanche): Compare debt payoff strategies
- [Compound vs Simple Interest](https://truetools.org/guides/compound-vs-simple-interest): Interest type comparison guide
- [Sales Tax Calculator](https://truetools.org/tools/sales-tax-calculator-usa): US sales tax by state
- [Savings Goal Calculator](https://truetools.org/tools/savings-goal): Plan your savings target
- [HSA Calculator USA 2026](https://truetools.org/tools/hsa-calculator-usa): Health Savings Account triple tax calculator 2026
- [401(k) Calculator 2026](https://truetools.org/tools/401k-calculator-usa-2026): 401k retirement projections 2026
- [Credit Card Payoff](https://truetools.org/tools/credit-card-payoff): Credit card payoff timeline
- [Amortization Schedule](https://truetools.org/tools/amortization-schedule): Loan amortization breakdown
- [Hourly to Salary](https://truetools.org/tools/hourly-to-salary): Convert hourly rate to salary
- [Salary vs Hourly Guide](https://truetools.org/guides/salary-vs-hourly): Salary vs hourly pay comparison guide
- [Investment Calculator](https://truetools.org/tools/investment-calculator): Project investment growth
- [Inflation Calculator](https://truetools.org/tools/inflation-calculator): Calculate inflation-adjusted value
- [Overtime Calculator](https://truetools.org/tools/overtime-calculator): Calculate overtime pay & earnings
- [Car Loan Interest Deduction Calculator](https://truetools.org/tools/car-loan-interest-deduction-calculator): OBBBA auto loan interest tax deduction
- [Overtime Tax Deduction Calculator](https://truetools.org/tools/overtime-tax-deduction-calculator): OBBBA no tax on overtime deduction
- [Tips Tax Deduction Calculator](https://truetools.org/tools/tips-tax-deduction-calculator): OBBBA no tax on tips deduction
- [Senior Tax Deduction Calculator](https://truetools.org/tools/senior-tax-deduction-calculator): OBBBA $6K senior deduction for 65+
- [Estate Tax Calculator USA 2026](https://truetools.org/tools/estate-tax-calculator-usa-2026): OBBBA raised estate tax exemption to $15M per person ($30M married). Calculate your federal estate tax.
- [Roth Conversion Calculator USA](https://truetools.org/tools/roth-conversion-calculator-usa): Compare Roth vs Traditional IRA, calculate Roth conversion tax, backdoor Roth & SECURE 2.0 catch-up.
- [CAGR Calculator](https://truetools.org/tools/cagr-calculator): Calculate compound annual growth rate (CAGR), total investment return, and year-by-year portfolio growth. Compare to S&P 500 benchmarks.
- [Charitable Donation Deduction Calculator 2026](https://truetools.org/tools/charitable-donation-calculator-usa-2026): New 2026 OBBBA: non-itemizers can deduct up to $2K (joint) / $1K (single) in cash donations. See your tax savings.
- [Inflation-Adjusted Salary Calculator](https://truetools.org/tools/inflation-adjusted-salary-calculator): Find out if your raise kept up with inflation. Real wage analysis using US CPI data 2000–2026.
- [Australian Income Tax Calculator](https://truetools.org/tools/income-tax-calculator-australia): AU income tax with Medicare levy, LITO & SAPTO
- [US Tax Refund Calculator](https://truetools.org/tools/tax-refund-calculator-usa): Estimate 2026 federal refund or balance due from W-2, withholding & credits
- [Trump Account Calculator](https://truetools.org/tools/trump-account-calculator-usa-2026): Check if your child qualifies for the $1,000 OBBBA Trump Account retirement contribution
- [Canadian Income Tax Calculator](https://truetools.org/tools/income-tax-calculator-canada): CA federal + provincial tax, CPP, EI & net income by province
- [Canada Capital Gains Tax Calculator](https://truetools.org/tools/capital-gains-calculator-canada): Canadian capital gains tax with 50% inclusion rate for ON, BC, AB, QC
- [Australian Salary Calculator](https://truetools.org/tools/salary-calculator-australia): Australian take-home pay after tax, super, Medicare & HELP
- [Medicare Levy Calculator Australia](https://truetools.org/tools/medicare-levy-calculator-australia): Medicare levy, surcharge & exemptions for 2025-26
- [Canadian Salary Calculator](https://truetools.org/tools/salary-calculator-canada): Canadian take-home pay after federal & provincial tax, CPP, EI & RRSP
- [UK Salary Calculator](https://truetools.org/tools/salary-calculator-uk): UK take-home pay after tax, NI & student loan
- [UK Stamp Duty Calculator](https://truetools.org/tools/stamp-duty-calculator-uk): SDLT for first-time buyers & home movers
- [Australian Stamp Duty Calculator](https://truetools.org/tools/stamp-duty-calculator-australia): Stamp duty for all AU states — NSW, VIC, QLD, WA & more
- [Canada Land Transfer Tax Calculator](https://truetools.org/tools/land-transfer-tax-calculator-canada): LTT for all CA provinces — Ontario, BC, Quebec & more. FTB rebates included.
- [UK Energy Bill Calculator](https://truetools.org/tools/energy-bill-calculator-uk): Estimate gas & electricity with Ofgem rates
- [UK National Insurance Calculator](https://truetools.org/tools/national-insurance-calculator-uk): Employee, employer & self-employed NI
- [UK Inheritance Tax Calculator](https://truetools.org/tools/inheritance-tax-calculator-uk): IHT with 2026 APR/BPR reforms
- [Student Loan Calculator USA](https://truetools.org/tools/student-loan-calculator-usa): Compare Standard, IBR, PAYE, SAVE & ICR repayment plans 2026
- [UK Student Loan Calculator](https://truetools.org/tools/student-loan-calculator-uk): Plan 1/2/4/5 repayment estimator
- [HECS-HELP Calculator Australia](https://truetools.org/tools/hecs-help-calculator-australia): HECS-HELP repayment calculator 2025-26 marginal rate system
- [TFSA Calculator Canada](https://truetools.org/tools/tfsa-calculator-canada): Calculate TFSA contribution room, tax-free growth and savings vs taxable account
- [Superannuation Calculator Australia](https://truetools.org/tools/superannuation-calculator-australia): Estimate retirement super with 12% SG rate, salary sacrifice & growth
- [RRSP Calculator Canada](https://truetools.org/tools/rrsp-calculator-canada): Canadian RRSP calculator 2026 — retirement balance, tax refund & after-tax income by province
- [CPP Calculator Canada](https://truetools.org/tools/cpp-calculator-canada): Estimate CPP retirement pension at age 60, 65 or 70 with breakeven comparison
- [529 Plan Calculator USA](https://truetools.org/tools/529-calculator-usa): 529 college savings plan calculator 2026 — balance, funding gap, Roth rollover
- [UK Dividend Tax Calculator](https://truetools.org/tools/dividend-tax-calculator-uk): Dividend tax with 2026/27 increased rates
- [UK Rental Yield Calculator](https://truetools.org/tools/rental-yield-calculator-uk): Calculate gross & net rental yield, cash-on-cash return and BTL stamp duty for UK buy-to-let properties
- [UK Council Tax Calculator](https://truetools.org/tools/council-tax-calculator-uk): Estimate annual and monthly council tax by band and region across England, Scotland and Wales
- [Canada Child Benefit Calculator](https://truetools.org/tools/ccb-calculator-canada): Estimate monthly CCB payments for the 2025-26 benefit year based on AFNI and children\
- [Canada EI Calculator](https://truetools.org/tools/ei-calculator-canada): Estimate weekly Employment Insurance benefits, duration, and 2026 premium based on earnings and region
- [Australian Negative Gearing Calculator](https://truetools.org/tools/negative-gearing-calculator-australia): Calculate rental property tax deduction, net rental loss, and after-tax cashflow for AU investment properties
- [Purchasing Power / PPP Calculator](https://truetools.org/tools/purchasing-power-calculator): Convert your salary across countries using purchasing power parity — US, UK, Canada, Australia and major cities
- [UK Mortgage Calculator](https://truetools.org/tools/mortgage-calculator-uk): UK mortgage payments with stamp duty
- [Mortgage Calculator Australia](https://truetools.org/tools/mortgage-calculator-australia): Australian mortgage repayments, LMI and stamp duty estimate
- [Mortgage Calculator Canada](https://truetools.org/tools/mortgage-calculator-canada): Canadian mortgage payments with CMHC insurance, semi-annual compounding and stress test
- [Emergency Fund Calculator](https://truetools.org/tools/emergency-fund): Plan your emergency savings goal
- [Rent vs Buy Calculator](https://truetools.org/tools/rent-vs-buy): Compare renting vs buying a home
- [Down Payment Calculator](https://truetools.org/tools/down-payment-calculator): Plan your home down payment savings
- [Crypto Profit Calculator](https://truetools.org/tools/crypto-profit-calculator): Crypto buy/sell profit & loss
- [DCA Calculator](https://truetools.org/tools/dca-calculator): Dollar cost averaging simulator
- [Staking Calculator](https://truetools.org/tools/staking-calculator): Crypto staking rewards estimator
- [Satoshi Converter](https://truetools.org/tools/satoshi-converter): BTC to Satoshi converter
- [OBBBA Tax Calculators 2026](https://truetools.org/tools/obbba-tax-calculators-2026): All 11 OBBBA tax provision calculators
- [Crypto Capital Gains Tax Calculator 2026](https://truetools.org/tools/crypto-capital-gains-calculator-usa-2026): Crypto capital gains tax with NIIT and Form 1099-DA
- [Subscription Bleed Calculator](https://truetools.org/tools/subscription-bleed-calculator): See the true cost of subscriptions — annual spend, category breakdown & opportunity cost if invested
- [Side Hustle Tax Calculator 2026](https://truetools.org/tools/side-hustle-tax-calculator-usa-2026): Estimate SE tax, income tax & quarterly payments for W-2 earners with 1099 gig income
- [UK Self-Assessment Tax Calculator](https://truetools.org/tools/self-assessment-calculator-uk): Self-assessment tax, NI, student loan & payments on account for sole traders & landlords
- [UK Capital Gains Tax Calculator](https://truetools.org/tools/capital-gains-calculator-uk): UK CGT calculator 2025/26 & 2026/27 — residential, other assets & BADR
- [FHSA Calculator Canada](https://truetools.org/tools/fhsa-calculator-canada): Canada First Home Savings Account — tax savings, growth projection & advantage over taxable account
- [Home Affordability Calculator Canada](https://truetools.org/tools/home-affordability-calculator-canada): Canadian home affordability with stress test, GDS/TDS & CMHC insurance
- [Australian Capital Gains Tax Calculator](https://truetools.org/tools/capital-gains-calculator-australia): Australian CGT with 50% discount, Stage 3 brackets & Medicare levy
- [US Home Affordability Calculator](https://truetools.org/tools/home-affordability-calculator-usa): US home affordability with Conventional, FHA & VA DTI limits and PMI
- [UK Pension Calculator](https://truetools.org/tools/pension-calculator-uk): UK pension projection — workplace pot, State Pension (NI years), 4% drawdown & on-track check
- [Home Affordability Calculator Australia](https://truetools.org/tools/home-affordability-calculator-australia): Australian home affordability with APRA 3% serviceability buffer, DTI ratios & LMI estimate
- [FIRE Calculator](https://truetools.org/tools/fire-calculator): FIRE number, Coast FIRE, years to financial independence & monthly savings needed to retire early
- [50/30/20 Budget Planner](https://truetools.org/tools/budget-planner-50-30-20): Allocate monthly income into needs (50%), wants (30%), and savings (20%) with actual vs target comparison

**Regional/year variants (56):**
- [USD to EUR Converter](https://truetools.org/tools/usd-to-eur-converter): Convert US Dollars to Euros with 2026 rates
- [GBP to USD Converter](https://truetools.org/tools/gbp-to-usd-converter): Convert British Pounds to US Dollars with 2026 rates
- [USD to INR Converter](https://truetools.org/tools/usd-to-inr-converter): Convert US Dollars to Indian Rupees with 2026 rates
- [USD to JPY Converter](https://truetools.org/tools/usd-to-jpy-converter): Convert US Dollars to Japanese Yen with 2026 rates
- [EUR to GBP Converter](https://truetools.org/tools/eur-to-gbp-converter): Convert Euros to British Pounds with 2026 rates
- [EUR to USD Converter](https://truetools.org/tools/eur-to-usd-converter): Convert Euros to US Dollars with 2026 rates
- [GBP to EUR Converter](https://truetools.org/tools/gbp-to-eur-converter): Convert British Pounds to Euros with 2026 rates
- [USD to SGD Converter](https://truetools.org/tools/usd-to-sgd-converter): Convert US Dollars to Singapore Dollars with 2026 rates
- [USD to KRW Converter](https://truetools.org/tools/usd-to-krw-converter): Convert US Dollars to South Korean Won with 2026 rates
- [USD to THB Converter](https://truetools.org/tools/usd-to-thb-converter): Convert US Dollars to Thai Baht with 2026 rates
- [USD to CAD Converter](https://truetools.org/tools/usd-to-cad-converter): Convert US Dollars to Canadian Dollars
- [USD to AUD Converter](https://truetools.org/tools/usd-to-aud-converter): Convert US Dollars to Australian Dollars
- [AUD to USD Converter](https://truetools.org/tools/aud-to-usd-converter): Convert Australian Dollars to US Dollars
- [CAD to USD Converter](https://truetools.org/tools/cad-to-usd-converter): Convert Canadian Dollars to US Dollars
- [USD to MXN Converter](https://truetools.org/tools/usd-to-mxn-converter): Convert US Dollars to Mexican Pesos
- [USD to PHP Converter](https://truetools.org/tools/usd-to-php-converter): Convert US Dollars to Philippine Pesos
- [USD to BRL Converter](https://truetools.org/tools/usd-to-brl-converter): Convert US Dollars to Brazilian Reais
- [Mortgage Calculator California](https://truetools.org/tools/mortgage-calculator-california): California mortgage payments & property tax 0.71%
- [Mortgage Calculator Texas](https://truetools.org/tools/mortgage-calculator-texas): Texas mortgage payments & property tax 1.60%
- [Mortgage Calculator Florida](https://truetools.org/tools/mortgage-calculator-florida): Florida mortgage payments & property tax 0.82%
- [Mortgage Calculator New York](https://truetools.org/tools/mortgage-calculator-new-york): New York mortgage payments & property tax 1.62%
- [Mortgage Calculator Illinois](https://truetools.org/tools/mortgage-calculator-illinois): Illinois mortgage payments & property tax 2.07%
- [Mortgage Calculator Pennsylvania](https://truetools.org/tools/mortgage-calculator-pennsylvania): Pennsylvania mortgage payments & property tax 1.49%
- [Mortgage Calculator Ohio](https://truetools.org/tools/mortgage-calculator-ohio): Ohio mortgage payments & property tax 1.53%
- [Mortgage Calculator Georgia](https://truetools.org/tools/mortgage-calculator-georgia): Georgia mortgage payments & property tax 0.83%
- [Mortgage Calculator North Carolina](https://truetools.org/tools/mortgage-calculator-north-carolina): North Carolina mortgage payments & property tax 0.77%
- [Mortgage Calculator Michigan](https://truetools.org/tools/mortgage-calculator-michigan): Michigan mortgage payments & property tax 1.38%
- [Salary Calculator USA 2025](https://truetools.org/tools/salary-calculator-usa-2025): Take-home pay after 2025 US taxes
- [Salary Calculator California](https://truetools.org/tools/salary-calculator-california): CA take-home pay with 13.3% state tax
- [Salary Calculator Texas](https://truetools.org/tools/salary-calculator-texas): TX take-home pay — no state income tax
- [Salary Calculator Florida](https://truetools.org/tools/salary-calculator-florida): FL take-home pay — no state income tax
- [Salary Calculator New York](https://truetools.org/tools/salary-calculator-new-york): NY take-home pay with 10.9% state tax
- [Salary Calculator Illinois](https://truetools.org/tools/salary-calculator-illinois): IL take-home pay with flat 4.95% tax
- [Salary Calculator Pennsylvania](https://truetools.org/tools/salary-calculator-pennsylvania): PA take-home pay with flat 3.07% tax
- [Salary Calculator Ohio](https://truetools.org/tools/salary-calculator-ohio): OH take-home pay with 0%-3.75% state tax
- [Salary Calculator Georgia](https://truetools.org/tools/salary-calculator-georgia): GA take-home pay with flat 5.39% tax
- [Salary Calculator North Carolina](https://truetools.org/tools/salary-calculator-north-carolina): NC take-home pay with flat 4.5% tax
- [Salary Calculator Michigan](https://truetools.org/tools/salary-calculator-michigan): MI take-home pay with flat 4.25% tax
- [Tax Bracket Calculator USA 2025](https://truetools.org/tools/tax-bracket-usa-2025): 2025 US federal income tax estimator
- [Paycheck Calculator USA 2025](https://truetools.org/tools/paycheck-calculator-usa-2025): Net pay after 2025 US taxes
- [Sales Tax Calculator California](https://truetools.org/tools/sales-tax-calculator-california): CA sales tax 7.25% + local rates
- [Sales Tax Calculator Texas](https://truetools.org/tools/sales-tax-calculator-texas): TX sales tax 6.25% + local rates
- [Sales Tax Calculator Florida](https://truetools.org/tools/sales-tax-calculator-florida): FL sales tax 6% + local surtax
- [Sales Tax Calculator New York](https://truetools.org/tools/sales-tax-calculator-new-york): NY sales tax 4% + local (NYC 8.875%)
- [Sales Tax Calculator Illinois](https://truetools.org/tools/sales-tax-calculator-illinois): IL sales tax 6.25% (Chicago 10.25%)
- [Sales Tax Calculator Pennsylvania](https://truetools.org/tools/sales-tax-calculator-pennsylvania): PA sales tax 6% (Philly 8%)
- [Sales Tax Calculator Ohio](https://truetools.org/tools/sales-tax-calculator-ohio): OH sales tax 5.75% + county rates
- [Sales Tax Calculator Georgia](https://truetools.org/tools/sales-tax-calculator-georgia): GA sales tax 4% + local (Atlanta 8.9%)
- [Sales Tax Calculator North Carolina](https://truetools.org/tools/sales-tax-calculator-north-carolina): NC sales tax 4.75% + county rates
- [Sales Tax Calculator Michigan](https://truetools.org/tools/sales-tax-calculator-michigan): MI flat 6% sales tax statewide
- [401(k) Calculator USA 2025](https://truetools.org/tools/401k-calculator-usa-2025): 401k retirement projections 2025
- [Self-Employment Tax Calculator 2026](https://truetools.org/tools/self-employment-tax-calculator-usa-2026): SE tax, income tax & total liability for freelancers
- [SALT Cap Calculator 2026](https://truetools.org/tools/salt-cap-calculator-usa-2026): OBBBA $40K SALT deduction cap calculator
- [Standard vs Itemized Deduction 2026](https://truetools.org/tools/standard-vs-itemized-usa-2026): Compare standard vs itemized deductions with $40K SALT cap
- [Best Free Mortgage Calculator 2026](https://truetools.org/guides/best-mortgage-calculator): Top-rated free mortgage calculator guide
- [Best Free Retirement Calculator 2026](https://truetools.org/guides/best-retirement-calculator): Top-rated free retirement calculator guide

### Health (31 tools, +2 variants)
- [BMI Calculator](https://truetools.org/tools/bmi-calculator): Body mass index for adults & kids
- [Calorie Calculator](https://truetools.org/tools/calorie-calculator): Daily calorie needs (TDEE)
- [Body Fat Calculator](https://truetools.org/tools/body-fat): Body fat percentage estimator
- [BMI vs Body Fat Guide](https://truetools.org/guides/bmi-vs-body-fat): BMI vs body fat percentage comparison
- [TDEE vs BMR Guide](https://truetools.org/guides/tdee-vs-bmr): TDEE vs BMR — what is the difference
- [Water Intake Calculator](https://truetools.org/tools/water-intake): Daily hydration needs
- [Pregnancy Due Date Calculator](https://truetools.org/tools/due-date): Pregnancy due date estimator
- [TDEE Calculator](https://truetools.org/tools/tdee-calculator): Total daily energy expenditure
- [Sleep Calculator](https://truetools.org/tools/sleep-calculator): Optimal bedtime & wake time
- [Macro Calculator](https://truetools.org/tools/macro-calculator): Daily protein, carbs & fat goals
- [Pace Calculator](https://truetools.org/tools/pace-calculator): Running pace & speed calculator
- [Heart Rate Zones](https://truetools.org/tools/heart-rate-zones): Training heart rate zones
- [HIIT Timer](https://truetools.org/tools/hiit-timer): HIIT interval timer with presets
- [Period Calculator](https://truetools.org/tools/period-calculator): Predict next period & fertile window
- [Ovulation Calculator](https://truetools.org/tools/ovulation-calculator): Estimate ovulation & fertile days
- [Ideal Weight Calculator](https://truetools.org/tools/ideal-weight): Ideal weight by multiple formulas
- [1RM Calculator](https://truetools.org/tools/one-rep-max): Estimate your one-rep max
- [Lean Body Mass Calculator](https://truetools.org/tools/lean-body-mass): Calculate lean mass & fat mass
- [Waist-to-Hip Ratio](https://truetools.org/tools/waist-hip-ratio): WHR with WHO risk categories
- [Body Roundness Index Calculator](https://truetools.org/tools/bri-calculator): BRI — better than BMI for body fat
- [GLP-1 Weight Loss Calculator](https://truetools.org/tools/glp1-weight-loss-calculator): Ozempic & Wegovy weight loss projections
- [GLP-1 Nutrition Tracker](https://truetools.org/tools/glp1-nutrition-tracker): Protein & hydration tracker for Ozempic/Wegovy/Mounjaro
- [A1C & Blood Sugar Converter](https://truetools.org/tools/a1c-calculator): Convert A1C % to estimated average glucose (eAG) in mg/dL and mmol/L. Pre-diabetic ranges and CGM context.
- [Fiber Intake Calculator](https://truetools.org/tools/fiber-intake-calculator): Get your daily fiber goal by age and gender. Track gut health and discover top high-fiber foods.
- [Sauna & Cold Plunge Calculator](https://truetools.org/tools/sauna-cold-plunge-calculator): Generate personalized sauna and cold plunge protocols based on experience level and health goals.
- [Dead Hang Timer & Grip Strength](https://truetools.org/tools/dead-hang-timer): Real-time dead hang timer. Compare your time to age and gender norms. Grip strength is a proven longevity marker.
- [BMR Calculator](https://truetools.org/tools/bmr-calculator): Basal metabolic rate estimator
- [BAC Calculator](https://truetools.org/tools/bac-calculator): Blood alcohol content estimator
- [Protein Calculator](https://truetools.org/tools/protein-calculator): Daily protein intake calculator
- [Pregnancy Week Calculator](https://truetools.org/tools/pregnancy-week-calculator): Track your pregnancy week
- [Biological Age Quiz](https://truetools.org/tools/biological-age-quiz): Estimate biological vs chronological age

**Regional/year variants (2):**
- [Best Free BMI Calculator 2026](https://truetools.org/guides/best-bmi-calculator): Top-rated free BMI calculator guide
- [Best Free Calorie Calculator 2026](https://truetools.org/guides/best-calorie-calculator): Top-rated free calorie calculator guide

### Text (15 tools)
- [Word Counter Online](https://truetools.org/tools/word-counter): Count words, chars & reading time
- [Text Case Converter](https://truetools.org/tools/text-case-converter): Upper, lower, title, camel case & more
- [Lorem Ipsum Generator](https://truetools.org/tools/lorem-ipsum): Placeholder text for designers
- [Reading Time Calculator](https://truetools.org/tools/reading-time): How long to read any article
- [Fancy Text Generator](https://truetools.org/tools/fancy-text): Unicode text styles for social media
- [Emoji Copy Paste](https://truetools.org/tools/emoji-picker): Search & copy emojis instantly
- [Symbols Copy Paste](https://truetools.org/tools/symbols-copy-paste): Special symbols & characters
- [Text to Binary](https://truetools.org/tools/text-to-binary): Convert text to binary & back
- [Remove Line Breaks](https://truetools.org/tools/remove-line-breaks): Remove or replace line breaks
- [Duplicate Line Remover](https://truetools.org/tools/duplicate-line-remover): Remove duplicate lines from text
- [Markdown Table Generator](https://truetools.org/tools/markdown-table): Create markdown tables visually
- [Whitespace Remover](https://truetools.org/tools/whitespace-remover): Remove extra spaces & whitespace
- [Strikethrough Text](https://truetools.org/tools/strikethrough-text): Generate strikethrough text
- [Small Text Generator](https://truetools.org/tools/small-text): Superscript, subscript & small caps
- [Upside Down Text](https://truetools.org/tools/upside-down-text): Flip text upside down

### Lifestyle (26 tools)
- [Time Zone Converter](https://truetools.org/tools/timezone-converter): World clock for remote teams
- [Tip Calculator USA](https://truetools.org/tools/tip-calculator-usa): Restaurant tip & bill splitter for USA
- [Age Calculator](https://truetools.org/tools/age-calculator): Exact age from any birthday
- [Random Number Generator](https://truetools.org/tools/random-number): Generate random numbers instantly
- [Coin Flip Simulator](https://truetools.org/tools/coin-flip): Virtual coin flip simulator
- [Dice Roller](https://truetools.org/tools/dice-roller): Roll dice online
- [Name Picker Wheel](https://truetools.org/tools/name-picker): Random name picker wheel
- [Typing Speed Test](https://truetools.org/tools/typing-test): Test your typing speed (WPM)
- [Pomodoro Timer](https://truetools.org/tools/pomodoro-timer): Focus timer with breaks
- [Love Calculator](https://truetools.org/tools/love-calculator): Fun love compatibility score
- [Cooking Converter](https://truetools.org/tools/cooking-converter): Cups to grams & kitchen units
- [Fuel Cost Calculator](https://truetools.org/tools/fuel-cost-calculator): Estimate trip fuel costs
- [Electricity Cost Calculator](https://truetools.org/tools/electricity-cost): Calculate power consumption cost
- [UK Car Tax Calculator](https://truetools.org/tools/car-tax-calculator-uk): VED rates by CO2 emissions & fuel type
- [UK Cost of Living Calculator](https://truetools.org/tools/cost-of-living-calculator-uk): Compare monthly living costs across London, Manchester, Birmingham, Edinburgh and more UK cities
- [Cost of Living Calculator Australia](https://truetools.org/tools/cost-of-living-calculator-australia): Estimate monthly expenses by city — Sydney, Melbourne, Brisbane, Perth, Adelaide
- [Canada Cost of Living Calculator](https://truetools.org/tools/cost-of-living-calculator-canada): Compare monthly living costs across Toronto, Vancouver, Montreal, Calgary and Ottawa
- [Dog Age Calculator](https://truetools.org/tools/dog-age-calculator): Dog years to human years
- [Baby Name Generator](https://truetools.org/tools/baby-name-generator): Find the perfect baby name
- [Shoe Size Converter](https://truetools.org/tools/shoe-size-converter): US, UK, EU shoe size chart
- [Ring Size Calculator](https://truetools.org/tools/ring-size-calculator): Find your ring size
- [Recipe Scaler](https://truetools.org/tools/recipe-scaler): Scale recipe servings up or down
- [Numerology Calculator](https://truetools.org/tools/numerology-calculator): Life path & expression numbers
- [MPG Calculator](https://truetools.org/tools/mpg-calculator): Miles per gallon calculator
- [Bra Size Calculator](https://truetools.org/tools/bra-size-calculator): Find your bra size
- [Dress Size Converter](https://truetools.org/tools/dress-size-converter): US, UK, EU dress size chart

### Math (17 tools)
- [Percentage Calculator](https://truetools.org/tools/percentage): Quick percentage calculations
- [Fraction Calculator](https://truetools.org/tools/fraction-calculator): Add, subtract, multiply fractions
- [Scientific Calculator](https://truetools.org/tools/scientific-calculator): Advanced scientific calculator
- [Unit Converter](https://truetools.org/tools/unit-converter): Convert length, weight, volume & more
- [Roman Numeral Converter](https://truetools.org/tools/roman-numeral): Convert numbers to Roman numerals
- [GPA Calculator](https://truetools.org/tools/gpa-calculator): Calculate your semester GPA
- [Grade Calculator](https://truetools.org/tools/grade-calculator): Calculate your class grade
- [GPA to WAM Converter](https://truetools.org/tools/gpa-wam-converter): Convert between US GPA (4.0), Australian WAM, UK degree class, and Canadian percentage grades
- [Number Base Converter](https://truetools.org/tools/number-base-converter): Binary, octal, decimal, hex
- [Statistics Calculator](https://truetools.org/tools/statistics-calculator): Mean, median, mode & more
- [Standard Deviation](https://truetools.org/tools/standard-deviation): Calculate standard deviation
- [Probability Calculator](https://truetools.org/tools/probability-calculator): Calculate event probabilities
- [Quadratic Solver](https://truetools.org/tools/quadratic-solver): Solve quadratic equations
- [Square Root Calculator](https://truetools.org/tools/square-root): Square & cube root calculator
- [Exponent Calculator](https://truetools.org/tools/exponent-calculator): Power & exponent calculator
- [Log Calculator](https://truetools.org/tools/log-calculator): Logarithm calculator (any base)
- [Matrix Calculator](https://truetools.org/tools/matrix-calculator): Matrix operations & determinant

### Web & SEO (31 tools, +1 variants)
- [Character Counter](https://truetools.org/tools/character-counter): Count characters in any text
- [URL Encoder Decoder](https://truetools.org/tools/url-encoder): Encode & decode URL strings
- [Slug Generator](https://truetools.org/tools/slug-generator): Generate URL-friendly slugs
- [Meta Tag Generator](https://truetools.org/tools/meta-tag-generator): Generate HTML meta tags for SEO
- [Favicon Generator](https://truetools.org/tools/favicon-generator): Create favicons from text, emoji, or image
- [Password Generator](https://truetools.org/tools/password-generator): Strong random password generator
- [HEX to RGB Converter](https://truetools.org/tools/hex-to-rgb): Convert HEX color codes to RGB
- [Color Palette Generator](https://truetools.org/tools/color-palette): Generate beautiful color palettes
- [RGB vs Hex Guide](https://truetools.org/guides/rgb-vs-hex): RGB vs Hex color codes comparison guide
- [Gradient Generator](https://truetools.org/tools/gradient-generator): Create CSS gradients visually
- [JSON Formatter](https://truetools.org/tools/json-formatter): Beautify & validate JSON online
- [Base64 Encoder Decoder](https://truetools.org/tools/base64): Encode & decode Base64 strings
- [CSS Minifier](https://truetools.org/tools/css-minifier): Minify CSS code online
- [HTML Encoder](https://truetools.org/tools/html-encoder): HTML entity encoder/decoder
- [QR Code Generator](https://truetools.org/tools/qr-code-generator): Generate QR codes instantly
- [Box Shadow Generator](https://truetools.org/tools/box-shadow-generator): CSS box-shadow visual editor
- [Social Media Preview](https://truetools.org/tools/social-media-preview): Preview OG cards for all platforms
- [Barcode Generator](https://truetools.org/tools/barcode-generator): Generate barcodes online
- [WiFi QR Code](https://truetools.org/tools/wifi-qr-code): WiFi QR code generator
- [Flexbox Generator](https://truetools.org/tools/flexbox-generator): CSS flexbox visual builder
- [CSS Grid Generator](https://truetools.org/tools/css-grid-generator): CSS grid layout builder
- [Border Radius Generator](https://truetools.org/tools/border-radius-generator): CSS border-radius editor
- [Schema Markup Generator](https://truetools.org/tools/schema-generator): JSON-LD schema generator
- [Robots.txt Generator](https://truetools.org/tools/robots-txt-generator): Create robots.txt files
- [OG Preview](https://truetools.org/tools/og-preview): Open Graph card preview
- [Aspect Ratio Calculator](https://truetools.org/tools/aspect-ratio): Calculate aspect ratios
- [Neumorphism Generator](https://truetools.org/tools/neumorphism-generator): Neumorphic CSS generator
- [Text Shadow Generator](https://truetools.org/tools/text-shadow-generator): CSS text-shadow editor
- [SVG Wave Generator](https://truetools.org/tools/svg-wave-generator): Generate SVG wave backgrounds
- [Blob Generator](https://truetools.org/tools/blob-generator): Random SVG blob shapes
- [PPI Calculator](https://truetools.org/tools/ppi-calculator): Pixels per inch calculator

**Regional/year variants (1):**
- [Best Free Password Generator 2026](https://truetools.org/guides/best-password-generator): Top-rated free password generator guide

### Date & Time (11 tools)
- [Date Difference Calculator](https://truetools.org/tools/date-difference): Days between two dates
- [Days Until Calculator](https://truetools.org/tools/days-until): Countdown to any future date
- [Work Days Calculator](https://truetools.org/tools/work-days): Business days between two dates
- [Unix Timestamp Converter](https://truetools.org/tools/unix-timestamp): Epoch time converter
- [Countdown Timer](https://truetools.org/tools/countdown-timer): Set a countdown timer
- [Online Stopwatch](https://truetools.org/tools/stopwatch): Stopwatch with lap times
- [Time Calculator](https://truetools.org/tools/time-calculator): Add & subtract hours, minutes, seconds
- [Timesheet Calculator](https://truetools.org/tools/timesheet-calculator): Weekly timesheet with overtime pay
- [Alarm Clock](https://truetools.org/tools/alarm-clock): Online alarm clock with alerts
- [Event Countdown](https://truetools.org/tools/event-countdown): Countdown to holidays & events
- [World Clock](https://truetools.org/tools/world-clock): Current time in world cities

### Developer (19 tools)
- [Regex Tester](https://truetools.org/tools/regex-tester): Test & debug regular expressions
- [Hash Generator](https://truetools.org/tools/hash-generator): SHA-256, SHA-512 hash generator
- [JWT Decoder](https://truetools.org/tools/jwt-decoder): Decode and inspect JWT tokens
- [UUID Generator](https://truetools.org/tools/uuid-generator): Generate UUID v4 identifiers
- [Cron Expression Generator](https://truetools.org/tools/cron-generator): Build crontab expressions visually
- [Diff Checker](https://truetools.org/tools/diff-checker): Compare two texts side by side
- [Markdown Editor](https://truetools.org/tools/markdown-editor): Write and preview markdown
- [Subnet Calculator](https://truetools.org/tools/subnet-calculator): IP subnet & CIDR calculator
- [JSON to CSV](https://truetools.org/tools/json-to-csv): Convert JSON arrays to CSV
- [Image to Base64](https://truetools.org/tools/image-to-base64): Convert images to Base64
- [SQL Formatter](https://truetools.org/tools/sql-formatter): Format & beautify SQL queries
- [YAML to JSON](https://truetools.org/tools/yaml-to-json): Convert YAML to JSON
- [XML to JSON](https://truetools.org/tools/xml-to-json): Convert XML to JSON
- [JavaScript Beautifier](https://truetools.org/tools/javascript-beautifier): Format & minify JavaScript
- [JSON Validator](https://truetools.org/tools/json-validator): Validate JSON with error details
- [JSON Path Finder](https://truetools.org/tools/json-path-finder): Find paths in JSON objects
- [HTML to Markdown](https://truetools.org/tools/html-to-markdown): Convert HTML to Markdown
- [PDF Merge & Split](https://truetools.org/tools/pdf-tools): Merge or split PDF files online
- [AI Token Estimator](https://truetools.org/tools/ai-token-estimator): Estimate tokens & costs across AI models

### Image (12 tools)
- [Image Compressor](https://truetools.org/tools/image-compressor): Compress images online for free
- [Background Remover](https://truetools.org/tools/background-remover): Remove image backgrounds for free
- [EXIF & Metadata Remover](https://truetools.org/tools/exif-remover): Strip GPS, EXIF & metadata from images
- [Image Watermark](https://truetools.org/tools/image-watermark): Add text watermarks to images
- [Screenshot Mockup Generator](https://truetools.org/tools/mockup-generator): Place screenshots in device frames
- [Image Resizer](https://truetools.org/tools/image-resizer): Resize images to any dimension
- [Meme Generator](https://truetools.org/tools/meme-generator): Create memes with custom text
- [Image Converter](https://truetools.org/tools/image-converter): Convert PNG, JPEG, WebP images
- [WebP Converter](https://truetools.org/tools/webp-converter): Convert WebP to JPG/PNG and back
- [JPEG vs PNG Guide](https://truetools.org/guides/jpeg-vs-png): JPEG vs PNG — when to use each format
- [Image Cropper](https://truetools.org/tools/image-cropper): Crop images to any ratio
- [Social Media Image Resizer](https://truetools.org/tools/social-media-image-resizer): Resize for Instagram, Facebook, etc

### Home & Construction (7 tools)
- [Square Footage Calculator](https://truetools.org/tools/square-footage): Calculate area of any room
- [Concrete Calculator](https://truetools.org/tools/concrete-calculator): Concrete volume & bags needed
- [Paint Calculator](https://truetools.org/tools/paint-calculator): Paint gallons for any room
- [Tile Calculator](https://truetools.org/tools/tile-calculator): Tiles needed for flooring
- [Gravel Calculator](https://truetools.org/tools/gravel-calculator): Gravel volume & weight
- [Mulch Calculator](https://truetools.org/tools/mulch-calculator): Mulch bags & cubic yards
- [Fence Calculator](https://truetools.org/tools/fence-calculator): Fence posts, rails & boards

### Engineering (2 tools)
- [Voltage Divider](https://truetools.org/tools/voltage-divider): Voltage divider calculator
- [LED Resistor Calculator](https://truetools.org/tools/led-resistor-calculator): LED resistor value finder

## Key Features

- **Free forever**: No subscriptions, no paywalls, no sign-up
- **Private**: All calculations run in your browser. Your data never leaves your device
- **Offline capable**: Works without internet once loaded
- **Mobile friendly**: Responsive design, 44px touch targets, no iOS zoom issues
- **Accessible**: WCAG 2.1 AA compliant, keyboard navigable, screen reader friendly
- **Fast**: No frameworks, no external libraries, no API calls
- **Dark mode**: System-aware with manual toggle, zero flash on load

## Contact

- Website: https://truetools.org
- About: https://truetools.org/about
- Contact: https://truetools.org/contact
- Privacy: https://truetools.org/privacy
- Terms: https://truetools.org/terms