Free Online Scientific Calculator

1. Tap the keypad buttons or type directly into the display to build an expression.
2. Set the DEG / RAD switch before evaluating anything with sin / cos / tan.
3. Use parentheses to group expressions and override default precedence.
4. Press = to evaluate, Clear to start over, or ⌫ to delete the last character.

The defining features over a four-function calculator are sin/cos/tan and their inverses, log (base 10), ln (natural log), exponentiation, square root, and the ability to group sub-expressions with parentheses while respecting standard operator precedence (parentheses > powers > × ÷ > + −).

This calculator supports the full button-driven workflow: tap or type expressions like 2 + 3 × sin(45) and get the result. It honors precedence, handles unary minus, and recognises named functions including arcsin, arccos, arctan, log, ln, sqrt, abs, and exp. The DEG/RAD toggle controls how the trig functions interpret their argument — set it correctly before evaluating angles or the result will be wildly off.

Useful for high-school and undergraduate math, physics labs, and engineering back-of-envelope work. Everything runs locally — no signup, no ads breaking the layout, no data leaves your device.