Free online calculators, from everyday math to science class.
Clean, fast calculators that work on any phone or computer. No sign-up, no clutter, and everything runs in your browser.
Calculators
Basic Calculator
Simple calculator with percent, memory keys, and history.
Scientific Calculator
Trig, logs, powers, roots, factorials, and degree/radian modes.
RPN Calculator
Reverse Polish stack calculator with a classic LED look.
Exam Practice Calculator
Four-function or scientific, with a timer and exam mode.
Statistics
Standard Deviation
Mean, median, mode, quartiles, variance, and SD, with steps.
Z-Score
Z-scores, percentiles, and p-values on the bell curve.
Finance
Loan Calculator
Monthly payment, total interest, and amortization schedule.
Compound Interest
Growth with monthly contributions, year by year.
TVM Calculator
Solve N, I/Y, PV, PMT, or FV like a financial calculator.
Planetary science
Weight on Other Planets
Your weight (and jump height) on every planet.
Escape Velocity
Escape and orbital speed for any planet or moon.
Orbital Period
Kepler's third law: period from distance and back.
Coming soon
Chemistry
Molar mass, dilutions, and the ideal gas law.
Health & Medical Study
BMI, body surface area, and dosage practice.
Looking for word tools, a world clock, or a recipe scaler? Visit our sister site, Amazatools.