A more detailed body fat percentage estimator that maps your result onto fitness categories and converts it into fat mass and lean mass.
Educational use only. This calculator is a general-purpose tool and does not replace medical advice. If a result surprises you or you have an underlying condition, consult a clinician before acting on it.
This tool runs entirely in your browser — no data is sent to our servers. If JavaScript is disabled, the fully interactive version will not run; enable JavaScript to compute results.
This calculator uses the same U.S. Navy circumference method as the standard Body Fat Calculator but adds context. Once it has your percentage, it places you in a fitness category (essential, athletic, fit, average, above average) and — if you provide your weight — splits your body into fat mass and lean mass in kilograms.
Knowing your lean mass is actually the more useful number for most fitness goals. Lean mass includes muscle, bone, organs and water — everything that is not stored fat. When you train and eat well, the goal is usually to grow or preserve lean mass while reducing fat mass. The scale alone cannot tell you which one is moving.
Category labels are general references derived from population studies (American Council on Exercise classifications, among others). They are starting points, not strict targets. A 28-year-old runner and a 58-year-old recreational walker can both be healthy at very different percentages.
Essential body fat is the minimum needed for normal physiological function — protecting organs, regulating hormones, storing fat-soluble vitamins. Roughly 3% for men, 12% for women. Falling below those floors affects health.
Because a percentage alone can be misleading. A 70 kg person at 25% body fat carries 17.5 kg of fat. A 90 kg person at the same percentage carries 22.5 kg. Seeing the kilogram total often motivates clearer goal-setting.
Every 2–4 weeks is plenty. Body composition changes slowly and weekly readings mostly capture noise.
The Body Fat Percentage Calculator lives alongside BMI Calculator, Ideal Weight Calculator, Smart Calorie Calculator (BMR & TDEE) on the Health & Fitness page. That landing page collects every health & fitness tool Dailiyo publishes, plus the editorial notes on formula sources, review cadence and how each result should (and should not) be interpreted. If a related health & fitness calculation isn't yet in the collection and you'd like to see it, drop a line via the contact page — the editorial team reviews every request and prioritises tools that come up most often in reader questions.