Health
Health & Fitness Calculators
Body composition, energy expenditure and training calculators using published equations, with the limitations of each equation stated plainly.
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All health & fitness calculators
About health & fitness calculators
These calculators implement well-documented equations — Mifflin-St Jeor for resting metabolic rate, the U.S. Navy circumference method for body fat, Devine and Robinson for ideal body weight — and name the equation on every page so you can look up its original study and its known error bars.
None of it is a diagnosis. BMI in particular is a population screening measure that cannot distinguish muscle from fat, and it misclassifies athletes and older adults routinely. Energy requirements calculated from any formula carry roughly a 10% individual variation. Use these numbers as starting points, track what actually happens, and talk to a clinician or registered dietitian before making significant changes.
Health calculator questions
Are the health calculators free?
Yes — every health calculator on CalcVerse is free to use, with no sign-up and no limit on how many calculations you run.
Do I need to install anything?
No. These are ordinary web pages. They load in any modern browser on desktop, tablet or phone and need no plugin, app or extension.
Where does the calculation happen?
Entirely in your browser, in JavaScript. Nothing you enter is transmitted to a server, which is why the tools keep working if your connection drops.
Can I see the formula being used?
Yes. Every calculator page shows the formula, defines each symbol, and prints the substituted working alongside the result so you can verify it by hand.