Finance

Discount Calculator — Free 2026

Calculate the final price after percentage discounts, double discounts, and sales tax. See your total savings instantly.

Please enter a valid price.
Please enter 0-100.
Please enter a valid rate.
For stacked/double discounts

Your Savings

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Final Price
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You Save
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Total Savings %
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After Tax

How It Works

  1. Enter the original price
  2. Set the discount and optional extras
  3. Read your savings
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Understanding Discounts and Sale Pricing

Discounts are everywhere — from Black Friday sales and clearance events to coupon codes and loyalty rewards. Understanding how discounts are calculated helps you make smarter shopping decisions and determine whether a sale is truly a good deal. This calculator handles single discounts, stacked double discounts, and sales tax in one step, so you know exactly what you will pay at the register.

The basic discount formula is simple: Sale Price = Original Price x (1 - Discount% / 100). A 25% discount on a $100 item means you pay $100 x 0.75 = $75, saving $25. But things get more interesting — and more commonly misunderstood — when multiple discounts are involved.

How Double Discounts Actually Work

Retailers sometimes advertise "take an additional 10% off sale prices" or "20% off plus an extra 15%." Many shoppers assume these percentages simply add together — 20% + 15% = 35% off — but that is not how sequential discounts work. The second discount applies to the already-reduced price, not the original. So 20% off $100 gives $80, and an additional 15% off $80 gives $68. The actual combined discount is 32%, not 35%. This stacking effect is why this calculator includes a second discount field — to show you the real savings.

For more help with percentage math, try our percentage calculator. If you are evaluating whether a purchase makes business sense, our profit margin calculator can help you see the numbers from the seller's perspective.

Sales Tax After Discounts

In the vast majority of jurisdictions, sales tax is calculated on the discounted price. If you buy a $200 item at 30% off, you pay tax on $140, not $200. This is standard practice in all US states that collect sales tax, as well as in most countries with VAT or GST. The exception is rare promotional arrangements where the retailer absorbs the discount but the tax authority still assesses tax on the full retail price — this is uncommon and typically applies to manufacturer rebates rather than point-of-sale discounts.

Is the Sale Really Worth It?

A discount is only valuable if you would have bought the item at full price. Behavioural economists have documented a phenomenon called the "sale price effect" — shoppers are more likely to buy something they do not need simply because it is on sale. Before celebrating a 40% discount, ask yourself: would I pay the final price if there were no sale tag? If the answer is no, you are not saving money — you are spending money you otherwise would not have spent. True savings come from getting a lower price on items you had already decided to purchase.

For informational purposes only. Consult a qualified professional before making financial or medical decisions.

Frequently Asked Questions

How do I calculate a discount?
To calculate a discount, multiply the original price by the discount percentage and divide by 100. The result is the amount you save. Subtract it from the original price to get the sale price. For example, 25% off $100 means you save $25 and pay $75.
How do double discounts work?
Double discounts are applied sequentially, not added together. A 20% discount followed by an additional 10% discount does not equal 30% off. Instead, the first discount reduces the price to 80% of the original, and the second reduces that result to 90% of the discounted price. So $100 with 20% then 10% off becomes $100 x 0.80 x 0.90 = $72, not $70.
Is sales tax calculated before or after the discount?
In most US states and countries, sales tax is calculated on the discounted price, not the original price. If an item costs $100 with a 25% discount, you pay tax on $75, not $100. This calculator applies tax after all discounts have been taken, which is the standard practice in retail.
What is the difference between a discount and a markdown?
A discount is a temporary price reduction, often expressed as a percentage off the regular price. A markdown is a permanent reduction to the retail price. In retail accounting, discounts reduce revenue while markdowns reduce the value of inventory. From a shopper's perspective, both result in paying less, but markdowns typically cannot be combined with additional coupons or promotional discounts.

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