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Body Composition Calculators

U.S. Navy body-fat %, lean mass, FFMI, BMR, TDEE, and a protein target with a GLP-1 mode. Built by a pharmacology expert. Runs entirely in your browser, no login, nothing stored.

Your Numbers

Tape at the narrowest neck point and at the navel, hips at the widest point. Measurements unlock body-fat %, lean mass, and protein targets.

> Enter height + weight to begin. Add age + tape measurements for the full readout.

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Leave your email and get a personal reply from the pharmacology expert who built this — training priorities, protein targets, supplement questions. A human answer, not a drip sequence.

Track these numbers over time → Enter the Arena