keencalculator

Every calculator you need. None of the waiting.

Type a problem below, or pick from 400+ purpose-built calculators. Your setups and results are saved on your device, so the second visit is faster than the first.

0

Type a sum — try 18% of 240, 3 ft 4 in + 28 in, or sqrt(2)*5

Tape

Your calculations appear here. Tap one to reuse it.

    Popular right now

    Browse by category

    Why people keep this tab open

    Instant

    Static pages, no frameworks, no spinners. Results update as you type.

    It remembers

    Your last inputs come back. Save named setups. Scroll your history.

    Private by design

    Everything is calculated and stored in your browser. No account, no upload.

    Shows its work

    Formulas, worked examples and tables — so you can check the answer.