Best Free Calculator
A fast browser calculator with a scientific mode one click away — free, no signup.
100% free
No signup
No watermark
Files processed in memory, never stored
✨
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How it works
- Enter your sum. Click the keys or type numbers and operators; use ( ) for grouping.
- Add scientific functions. Open Advanced options for sin, cos, tan, log, ln, √ and powers.
- Get the result. Press = or Enter. Everything is computed locally in your browser.
About this tool
A clean calculator that works the moment the page loads — no install, no signup, nothing sent anywhere (it runs entirely in your browser). Tap the keys or type with your keyboard, use parentheses for order of operations, and hit Enter to evaluate. When you need more than the basics, the Advanced options reveal a scientific row — trig, logarithms, square root and powers — without cluttering the simple view the rest of the time.
What people use it for
- Quick everyday arithmetic without opening an app
- Work out percentages, powers or square roots
- Evaluate an expression with parentheses and order of operations
- Trig and logarithms via the scientific row
Frequently asked questions
It runs entirely in your browser, so nothing you type is sent anywhere, and it keeps working even with a flaky connection once the page has loaded.
Yes. Type numbers and + − × ÷ ( ), press Enter to evaluate, Backspace to delete and Escape to clear.
A scientific row — sine, cosine, tangent, log base 10, natural log, square root and powers — hidden by default so the everyday view stays simple.
Yes. Multiplication and division are applied before addition and subtraction, and you can use parentheses to group parts of an expression.
It uses standard double-precision arithmetic, so it is accurate for everyday and scientific use; extremely large numbers may round at the edges, as in any calculator.
Completely free, no account, no watermark, no limits — it is a client-side tool with nothing to meter.
Yes. It runs in your browser, so Calculator works on phones and tablets as well as desktop — there is no app to install.
Usually just a few seconds for a typical file — Calculator starts working the moment you give it your input.
All modern browsers — Chrome, Safari, Firefox and Edge. Calculator needs nothing installed beyond the browser you already use.