Body Composition Calculators
Estimate body fat percentage, BMI, ideal weight, and more using validated measurement methods with multi-formula comparison.
Body Fat Calculator — 4 Methods
Estimate body fat percentage using Navy tape, Jackson-Pollock skinfold, and BMI-derived methods. Compare results from up to four validated formulas.
BMI Calculator — With Category & Healthy Range
Calculate your Body Mass Index with WHO category classification, BMI Prime ratio, and personalised healthy weight range. Free science-based tool.
Ideal Weight Calculator — Compare 4 Formulas
Estimate your ideal body weight using Hamwi, Devine, Robinson, and Miller formulas with WHO BMI-based range. Free side-by-side comparison.
Waist-to-Hip Ratio Calculator — WHO Risk Assessment
Calculate your waist-to-hip ratio with WHO health risk classification. Simple tape measurement tool backed by epidemiological research.
Body Surface Area Calculator — Du Bois & Mosteller
Calculate body surface area using Du Bois and Mosteller formulas with side-by-side comparison. Free BSA tool for clinical and fitness reference.
Military Body Fat Calculator — DoD Tape Test
Estimate body fat percentage using the official DoD tape-test equations with pass/fail assessment against U.S. military service standards.
BMI Category Checker — Detailed Range Analysis
Check your BMI category with range position, healthy weight targets, BMI Prime, and Deurenberg body fat estimate. Free detailed analysis tool.
Pregnancy Weight Gain Calculator — IOM Guidelines
Estimate recommended pregnancy weight gain by trimester using IOM 2009 guidelines. Covers singleton and twin pregnancies with BMI-adjusted ranges.
How to Measure Body Fat — Complete Method Guide
Compare body fat measurement methods from tape measure to DEXA. Accuracy, cost, accessibility, and step-by-step technique for each approach.