Free Online Calculators

A clean Windows-style calculator for everyday arithmetic with keyboard support.

Solve any percentage problem: find %, increase/decrease, and more.

Full scientific calculator with trig, logarithms, powers, and more.

Calculate your GPA by entering course grades and credit hours.

Convert length, weight, temperature, volume, speed, and more.

Calculate room area for flooring, painting, and renovation projects.

Voltage drop, wire sizing, Ohm's Law, conduit fill, 3-phase power, and motor sizing.

Drain slope, pipe sizing, water heater sizing, pressure drop, BTU heat loss, and sump pump sizing.

Calculate exact age in years, months, days — and your next birthday.

Count exact days, weeks, and months between any two dates.

Convert times between world time zones instantly.

Calculate monthly payments, total interest, and view full amortization schedule.

Find your monthly EMI for any loan amount, rate, and tenure.

See how your money grows with the power of compound interest.

Calculate take-home pay after tax for Canada & USA — by province or state.

Project your retirement savings and see if you're on track.

Calculate tip amount, total bill, and split the check among friends.

Calculate your Body Mass Index and find your healthy weight range.

Calculate daily calorie needs using Mifflin-St Jeor for weight goals.

Calculate your due date, current week, and pregnancy milestones.

Estimate body fat percentage using the US Navy method.