How to use the Body Fat Calculator tool
3 simple steps · under a minute
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Measure yourself
Use a soft tape to measure your neck, waist and (for women) hips.
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Enter your measurements
Type them with your height, in inches or centimetres.
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See your body fat
Read your body fat percentage, category, fat mass and lean mass.
About Body fat calculator
Body fat percentage tells you how much of your weight is fat, which says more about health and fitness than weight or BMI alone. This body fat calculator uses the US Navy method, which estimates body fat from your height and neck, waist and hip measurements.
Measure in the morning, relaxed and without pulling the tape tight, and take each measurement two or three times. The Navy method is usually within a few percent of more expensive methods like DEXA scans, making it a practical way to track progress over time.
Tape-measure method
The US Navy formula needs only a tape measure — no scales or calipers.
Fitness categories
Shows whether you are in the essential, athletic, fitness, average or obese range.
Fat and lean mass
Add your weight to split it into fat mass and lean body mass.
Frequently asked questions
How do I measure for the Navy body fat test?
Neck just below the larynx; waist at the navel for men and at the narrowest point for women; hips at the widest point (women only).
What is a healthy body fat percentage?
Roughly 14–24% for men and 21–31% for women falls in the fitness-to-average range for adults.
How accurate is the US Navy method?
It is usually within about 3–4 percentage points of laboratory methods, which is good enough for tracking changes.
Is body fat better than BMI?
It is more informative, because BMI cannot tell muscle from fat. Using both gives a fuller picture.
Is this medical advice?
No. It is an estimate; talk to a doctor about your health.