Free tools for finance, health, math, and everyday life. No sign-ups. No paywalls.
MayoCalc is a collection of 200+ free calculators designed to help you make better decisions. Every calculator runs in your browser with no data sent to our servers and no account required.
Compound interest, mortgage affordability (28/36 rule), retirement planning (4% rule), inflation (real CPI data from 1913), auto loan, rent vs. buy, student loan repayment, savings goals, investment return (CAGR), paycheck calculators for all 50 states, and amortization schedules.
CT Calcium Score with exact MESA percentile data for all eight demographic groups. MESA 10-Year CHD Risk Score with Coronary Age. Plus BMI, calorie/TDEE (Mifflin-St Jeor), body fat (U.S. Navy method), macros, sleep cycles, caffeine half-life, due date, ovulation, running pace, heart rate zones, and BAC.
Tip calculator, electricity cost, fuel cost, unit price comparison, age calculator, time zone converter, date difference, square footage, concrete, unit converter (9 categories), random number generator, password strength, and more.