Calculate · Understand · Compare · Decide

Clear answers for everyday decisions.

Fast, private calculators and developer tools for health, money, study, work and everyday life.

Private — runs in your browser 112 tools · Instant results

Popular tools

Body Mass Index from height and weight.

Monthly payment and total interest.

Find percentages and changes.

Exact age from date of birth.

Growth with compounding.

Unix time to readable date.

Understand your body, one number at a time.

Money math made plain.

Zakat, riba-free math.

Everyday math, unstuck.

Time, decoded.

Grades and GPAs, sorted.

Any unit, instantly.

Plan the build.

Text and data utilities.