Free Online Calculator (Standard & Scientific)

Perform basic math or advanced scientific calculations instantly. Supports trigonometry, logarithms, and exponents directly in your browser.

GENERAL
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Use keyboard: digits, operators, Enter to calculate, Esc to clear

About This Tool

This versatile tool functions as both a standard calculator for everyday arithmetic and a scientific calculator for complex equations.

Everything runs locally in your browser using JavaScript, ensuring your calculations remain 100% private and the tool works offline.

Frequently Asked Questions

Yes, after the first load. Once the page files are cached in your browser (or you use a service worker/PWA), the calculator keeps running fully in your browser.
No. Your input stays on your device. The math runs locally in your browser and isn’t sent to a server.
Percent means “per hundred.” So 12% becomes 12 ÷ 100. Example: 12% × 200 = (12 ÷ 100) × 200 = 24.
Basic arithmetic with parentheses: + − × ÷ (also * and /), decimals, and %.
Browsers use floating-point math, so you can sometimes see tiny rounding artifacts. Example: 0.1 + 0.2 may display as 0.30000000000000004. If you want cleaner output, round the final result to a fixed number of decimals.
Yes. It works on modern phones, tablets, and desktops. If tapping feels tight on mobile, increase button size and font size for easier input.
Not in this tool. It’s built for everyday arithmetic. For trigonometry, logs, powers, and similar, use a scientific calculator.