🧮 Calculators
Body Fat Percentage Calculator
Estimate body fat percentage using the US Navy circumference method. Only needs a tape measure — no calipers or scales required. See lean mass and health category.
💪 Used 10,847 times this month
📏 The US Navy method uses body measurements (neck, waist, hip) to estimate body fat. Accurate to within 3-4% for most people — good enough to track progress.
Body Composition
Body Fat %
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Fat Mass
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Lean Mass
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CATEGORY
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How it works
01
Measure
Neck (below Adam's apple), waist (at navel), and hip (women only, widest point).
02
Enter Data
Fill in gender, age, height, weight, and measurements.
03
See Result
Body fat %, lean mass, and category.
Frequently asked questions
How accurate is the US Navy method?
Within 3-4% for most people. Not as precise as DEXA scans or hydrostatic weighing (the gold standards), but way more accurate than BMI and free — perfect for tracking progress over time.
How do I measure correctly?
Neck: just below Adam's apple, tape parallel to floor. Waist: at your belly button, relaxed (do NOT suck in). Hip (women): widest point of hips. Use a soft tape, snug but not tight.
What is a healthy body fat range?
Men: 10-20% is good, 6-13% is athletic. Women: 18-28% is good, 14-20% is athletic. Under 6% (men) or 14% (women) can be dangerous.
Is this medical advice?
No. This is a general fitness tool. For medical body composition assessment, see a doctor or get a DEXA scan.
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