About

What Is This Tool?

Significant Figures Calculator is a free, browser-based tool that rounds any number to a specified number of sig figs or counts how many significant figures a number contains. Every result includes a step-by-step breakdown of the calculation so you learn the rules, not just the answer.

Who Built It?

This site was built by a small independent developer with the goal of making math and science tools fast, clear, and free. Whether you're a student checking homework, a teacher demonstrating sig fig rules, or an engineer double-checking precision, this tool is built for you.

Our Mission

We believe utility tools on the web should be simple, honest, and free of unnecessary friction. No account required, no paywalls, no misleading results — just a reliable calculator that explains its work.

Accuracy

All calculations run entirely in your browser. The rounding algorithm correctly handles edge cases including very large numbers, very small decimals, trailing zeros, and scientific notation input. If you find a result that seems wrong, please contact us.

Privacy

No data you enter is ever sent to a server or stored anywhere. All computation happens locally in your browser. See our Privacy Policy for full details.

Contact

Bug reports, questions, and feedback are always welcome via our contact page.