Math

Scientific Calculator Online — Free 2026

A full-featured scientific calculator with trig, logarithms, exponents, and memory — right in your browser, no sign-up needed.

How It Works

Enter an expression
Use scientific functions
Get the result

About This Scientific Calculator

This free scientific calculator gives you the power of a handheld scientific calculator directly in your web browser. It handles standard arithmetic, trigonometric functions (sin, cos, tan in degrees), logarithms (both common log base 10 and natural log), square roots, exponents, and the constants pi and e. A built-in memory register lets you store intermediate results and recall them later, just like a physical calculator. The entire tool runs client-side with no server calls, so it works even when you are offline.

Safe Expression Parsing

Unlike many online calculators, this tool does not use JavaScript's eval() function. Instead, it uses a recursive descent parser that tokenizes your expression and evaluates it step by step. This approach is both more secure and more predictable. The parser supports operator precedence (multiplication and division before addition and subtraction), parenthesized sub-expressions, and function calls like sin(), cos(), and log(). If you type an invalid expression, you will see a clear error message rather than a cryptic JavaScript exception.

When to Use a Scientific Calculator

Scientific calculators are essential for students and professionals working with trigonometry, physics, engineering, and statistics. Unlike basic calculators, they understand order of operations automatically — so typing 2 + 3 * 4 correctly gives 14, not 20. They also handle nested parentheses, making it easy to evaluate complex formulas in a single expression. If you need to work with fractions, check out our fraction calculator, or for unit conversions try the unit converter.

Memory Functions Explained

The four memory keys work like a single-register clipboard. M+ adds the current displayed value to memory, M- subtracts it, MR recalls the stored value into your expression, and MC clears the memory. A small indicator appears when memory is non-zero so you always know whether a value is stored. This is handy for running totals or for temporarily parking a result while you compute something else.

Frequently Asked Questions

Does this scientific calculator use eval()?

No. This calculator uses a safe expression parser built from scratch. It tokenizes your input and evaluates it using a recursive descent parser that only recognizes numbers, arithmetic operators, and approved Math functions. No user input is ever passed to eval() or Function().

What functions does this scientific calculator support?

It supports sin, cos, tan (in degrees), log (base 10), ln (natural log), square root, squaring, power (x^y), pi, Euler's number e, parentheses, percentage, and sign toggle. Memory keys MC, MR, M+, and M- are also included.

Are trigonometric functions calculated in degrees or radians?

By default all trigonometric functions (sin, cos, tan) use degrees because that is the most common convention for general-purpose calculators. The input is converted to radians internally before applying the JavaScript Math functions.

Can I use this calculator on my phone?

Yes. The calculator is fully responsive and works on any device with a modern web browser. The button grid automatically adjusts to fit smaller screens. No app download or installation is needed.