Math & Calc Tools

Free online math calculators — percentage calculator, BMI calculator, tip and bill split, temperature converter, age calculator, and more. Instant results.

6 tools

Text & Content Image & Design Code & Dev Math & Calc Security Competitive Programming PDF Utilities

% Calculator

Calculate percentages, percentage change, and what percent one number is of another.

BMI Calculator

Calculate your Body Mass Index (BMI) using metric or imperial units with health category feedback.

Tip Calculator

Calculate tip amounts and split bills between any number of people. Quick tip buttons, custom percentage, and per-person breakdown.

Temperature

Convert temperatures between Celsius, Fahrenheit, Kelvin, Rankine, and Delisle instantly. Common reference points included.

Age Calculator

Calculate your exact age in years, months, days, hours, and minutes from your date of birth. Shows total counts and next birthday countdown.

Also in Math & Calc

Tools from other categories tagged with Math & Calc

Timestamp

Convert Unix timestamps to human-readable dates and convert dates back to Unix time. Live clock with ISO 8601, UTC, and local formats.

Frequently Asked Questions

How accurate are these calculators?

All calculators use high-precision JavaScript math. Results are accurate to several decimal places — more than enough for everyday use.

Do I need to create an account?

No account or login is required. Every calculator is free and ready to use instantly.

Can I use these on mobile or tablet?

Yes. All our calculators are fully responsive and work beautifully on any screen size — phone, tablet, or desktop.