Calculators that get it right.
Fast, accurate calculators for finance, health, and everyday life. Every result uses verified formulas, with a clear breakdown you can trust.
60 free calculators and counting.
Popular calculators
Loan
Monthly payment and a full amortization schedule for any loan.
OpenCompound interest
Project how regular investing grows over time.
OpenTake-home pay
Turn gross salary into net pay after tax and deductions.
OpenRetirement / FIRE
Find your number and when you could reach it.
OpenDebt payoff
Plan the fastest or cheapest way out of multiple debts.
OpenRefinance
See whether refinancing is worth it and when you break even.
OpenTDEE / calories
Your maintenance calories and macro targets for any goal.
OpenDue date
Estimate your due date and track each week.
OpenRent vs buy
Compare renting against buying over your time horizon.
OpenTip
Add a tip and split the bill evenly, to the cent.
OpenBrowse by category
Finance
Loans, debt, tax, savings, and investment math you can trust.
17 tools
Health
Calorie, pregnancy, cycle, and fitness calculators.
14 tools
Property
Buy versus rent, affordability, yield, and payback.
5 tools
Insurance
Estimate how much coverage you actually need.
1 tools
Legal
Rough estimates for common legal questions.
1 tools
Everyday
Quick, everyday calculators and converters.
10 tools
Developer
Small, correct utilities for developers.
12 tools