Rounding Calculator

Round any number to a set number of decimal places, significant figures, or the nearest multiple (5, 0.25, 100…). Runs in your browser.

Runs in your browser — your file never leaves your device

Frequently asked questions

Is Rounding Calculator free to use?

Yes — Rounding Calculator is completely free with no limits, no watermarks and no sign-up. It runs in your browser, so there is nothing to pay for.

Are my files uploaded or stored anywhere?

No. This tool does all its work locally in your browser using your own device's power. Your files never leave your device and we never see them.

Do I need to install anything or create an account?

No installation and no account needed. Rounding Calculator works on any modern browser — Windows, Mac, Linux, Android and iPhone.

How do I use Rounding Calculator?

Open the tool, add your file (or paste your content), adjust any options, then press “Round it”. Your result is ready to download in seconds.

0.00034 ↔ 3.4 × 10⁻⁴.

Marks → percentage + SSC/HSC grade band.

What you need on the final to hit your goal.

Arithmetic & geometric: nth term + sum.

Pure-CSS triangles.

Check that URLs are well-formed.