Free Online Calculator
Type a math expression and get the answer instantly — runs entirely in your browser.
About this calculator
This free online calculator evaluates arithmetic expressions instantly, right in your browser. Nothing is sent to a server — the math runs locally, works offline, and needs no sign-up.
Supported operations
- Add, subtract, multiply, divide:
+,-,*,/ - Parentheses for grouping:
(1 + 2) * 3 - Powers with
^:2^10 - Functions:
sqrt,sin,cos,tan,ln,abs, and more
Examples
2 + 2 * 3→8sqrt(16)→43.14 * 2^2→12.56
FAQ
Is it really free?
Yes — and private. Your input never leaves your device.
Does it work offline?
Yes, once the page has loaded.
What happens if I divide by zero?
You get an error, not Infinity. Any expression whose result is non-finite —
1/0, huge overflows, sqrt(-1) — is rejected with a clear message instead of
returning a misleading number.
Which functions and constants can I use?
Beyond + - * /, ^ for powers and parentheses, you can call sqrt, abs,
exp, ln, the trig family (sin, cos, tan and their inverses), floor,
ceil, round, min and max, and use the constants pi and e — for
example sin(pi/2) or e^2.
Developer & Automation Access
Run it from the terminal
Same engine as this page, headless — via the gizza CLI:
gizza tool calculator "2 + 2 * 3"New to the CLI? Get gizza →
Open it by URL
Pre-fill and auto-run this tool with query parameters — the names match the API/CLI:
https://gizza.ai/tools/calculator/?expr=2%20%2B%202%20%2A%203Machine-readable descriptor: tool.json — title + parameters JSON Schema for agents.