Free, fast, research-backed calculators for life's important numbers.
MayoCalc was built on a simple idea: everyone deserves access to accurate, beautifully designed calculators that help them make smarter decisions. Whether you are figuring out how much house you can afford, understanding your calcium score, splitting a dinner bill, or estimating your daily calories, we believe the tools should be free, fast, and backed by real data.
We take accuracy seriously. Our CT Calcium Score Calculator uses percentile data sourced directly from the Multi-Ethnic Study of Atherosclerosis (MESA) reference tool, the gold standard for coronary calcium risk stratification. Our financial calculators use standard actuarial formulas. Our health calculators use peer-reviewed equations like Mifflin-St Jeor (calories) and the U.S. Navy method (body fat).
Every calculator on MayoCalc is completely free to use. No sign-ups, no email gates, no premium tiers. Your data stays in your browser and is never sent to our servers.
Have a suggestion for a new calculator? Found an error? Want to say hello? Reach us at [email protected].