RepCalcs.com provides free health and fitness calculators including BMI, body fat percentage, TDEE, macro calculators, and workout planning tools. With 28 calculators across 4 categories — from body metrics and nutrition planning to workout optimization and fitness goal tracking — we cover the tools fitness enthusiasts actually need, without the clutter.
Our mission is simple: give people accurate, fast, and free fitness calculators with no barriers. There are no accounts to create, no paywalls to hit, and no personal data to hand over. You open a calculator, enter your stats, and get your answer. That's it.
Every calculator on RepCalcs uses published scientific formulas from exercise science and sports nutrition research. We build each tool with care for both accuracy and speed, so the math runs entirely in your browser with instant results.
Whether you're calculating your BMI, estimating body fat with the Navy method, finding your one rep max, planning macros for a bulk or cut, or generating a workout split, RepCalcs is here to help. We always recommend consulting with a healthcare professional for personalized medical advice.
Free, fast, and built for every fitness level.