Scientific Calculator
A full scientific calculator with trigonometry, logs, powers, factorials, history and keyboard input.
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How to use
- Type a calculation such as 2(3+4)^2 or sin(30), or use the keypad.
- Press Enter or = to calculate; the answer is kept as “ans” for the next step.
- Switch between degrees and radians for trigonometry.
- Select a past calculation in the history to reuse it.
How it works
Expressions are read by a purpose-built parser that follows the usual order of operations (brackets, powers, multiplication and division, then addition and subtraction), so typed text is never run as code. Powers are right-associative (2^3^2 = 2^9) and −2^2 = −4, matching mathematical convention. Results are rounded to 12 significant digits to hide floating-point noise, so 0.1 + 0.2 shows 0.3.
Limitations
- Uses double-precision numbers: about 15–16 significant digits, and factorials only up to 170! (use the Factorial Calculator for exact large values).
- Complex numbers are not supported, so roots of negative numbers are reported as errors.
- History is kept only until you leave the page.
Privacy
Your text is processed entirely in this browser tab. Nothing is uploaded, logged or saved by this tool.
Local processing protects your data from being uploaded, but it cannot protect against a compromised device or malicious browser extensions.