📐 Body Fat Calculator
Enter a few tape measurements to estimate your body-fat percentage with the U.S. Navy method, along with your category, fat mass, and lean mass — no calipers required.
📐 Estimate Your Body Fat
What is a Body Fat Calculator?
Body-fat percentage tells you how much of your weight is fat versus lean tissue — a far more useful training metric than scale weight or BMI alone. This calculator uses the U.S. Navy circumference method, which estimates body fat from simple tape measurements you can take at home.
Use it to track composition changes as you cut or bulk, rather than fixating on the scale. The result is a general fitness estimate, not medical advice — consult a doctor or qualified trainer, warm up, and use proper form in your training program.
❓ Frequently Asked Questions
How accurate is the Navy tape method?
The U.S. Navy circumference method is typically within about 3–4% of a DEXA scan for most people, which is good enough to track changes over time at home. It's less accurate at the extremes — very lean or very heavy — and depends heavily on measuring at the right landmarks with a snug, level tape.
How do I measure for the most consistent result?
Measure first thing in the morning, before eating, with a flexible tape held level and snug but not compressing the skin. Take each measurement at the same landmark every time — neck below the larynx, waist at the navel, hips at the widest point — and average two readings. Consistency matters more than a single perfect number.
What body-fat percentage should I aim for?
Healthy ranges differ by sex and goal: roughly 10–20% for men and 18–28% for women as general fitness ranges, with athletes often lower. There's no single 'right' number — it's a general estimate, not medical advice, so discuss targets with a doctor or qualified trainer.