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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.

Also free: supplement × medication interaction checker →

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.

Want the full toolkit?

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