The calculator hub foreverything you measure.

200 hand-built tools for finance, health, math, home projects, and everyday life. No signups, no fluff — just numbers.

Popular calculators

Calculate your monthly mortgage payment, total interest, and full amortization. Free, accurate, and works in any currency.

Calculate your Body Mass Index (BMI) instantly. Free BMI calculator for adults in metric and imperial units, with WHO category breakdown.

See how money grows over time with compounding. Enter principal, rate, time, and optional monthly contributions to project future value.

Convert between major world currencies using live exchange rates from the European Central Bank, updated daily.

Calculate exact age in years, months, days, hours, and minutes from any birthdate. Also shows total days lived and next birthday countdown.

Calculate percentage of a number, percentage change between two numbers, and what percent X is of Y. Fast, clean, and works with any values.

Calculate tip amount, total bill, and per-person share split across any number of people. Works for any currency and tip percentage.

Convert between hourly, weekly, biweekly, monthly, and annual pay. Handles full-time, part-time, and freelance hours per week.

9 categories of daily-use math.

Loans, mortgages, investments, taxes, and everyday money math.

BMI, calories, body composition, pregnancy, and athletic performance.

Age, durations, time zones, and date arithmetic.

Percentages, statistics, GPA, and unit conversion.

Square footage, paint, tile, concrete, lumber, and home projects.

Fuel economy, trip cost, auto loans, and vehicle math.

Recipe scaling, unit conversion, and cooking math.

GPA, grades, reading time, typing speed, and study planning.

Trip cost, travel budget, flight time, and jet lag.