Understand your body better with free, evidence-based calculators
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Free health and fitness calculators
Body Calculator has more than 130 free calculators for nutrition, body composition, fitness, women’s health and lab results. Each one uses the formula named in published guidelines or peer-reviewed research, shows that formula on the page and lists its sources, so you can check how every number is worked out. Popular tools include the BMI Calculator, the TDEE Calculator, the Due Date Calculator and the One Rep Max Calculator.
Key calculators are medically reviewed by the physicians and registered dietitians on our Expert Review Board. Everything runs in your browser, with no sign-up and no ads, and nothing you enter is sent to or stored on our servers. Results are estimates for information only, not medical advice.