Biological

Calculate the current 2026 U.S. Army waist-to-height ratio, apply three-decimal truncation and check the 0.55 body-composition standard.

Calculate waist-to-hip ratio and waist-to-height ratio in centimetres or inches, with optional WHO WHR and half-height comparisons.

Calculate prepregnancy BMI, current weight gain, the CDC total gain range and the corresponding end-of-pregnancy weight range for one baby or twins.

Calculate body surface area from height and weight with the Mosteller, Du Bois and Haycock formulas, metric or US units, and a clear method comparison.

Estimate VO2 max with the Cooper 12-minute run, Rockport one-mile walk, measured heart-rate ratio, or absolute and relative oxygen conversion.