Math & Calc Tools

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

5 tools
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% 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.

Frequently Asked Questions

Everything you need to know about math & calc tools

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.