Calculator
Body Fat Calculator
Estimate your body fat percentage with the U.S. Navy method, just a few tape measurements, no special equipment.
Your details
Estimated body fat
Fitness
An estimate from the U.S. Navy method, typically within 3–4 percentage points of lab measurement. Measure carefully for the best result.
The U.S. Navy method
This calculator uses the U.S. Navy circumference method, which estimates body fat from a few tape measurements rather than expensive equipment. It's a practical, repeatable way to track changes over time, especially useful alongside BMI, which can't tell muscle from fat.
How to measure
Measure your neck just below the larynx, your waist at the navel (men) or narrowest point (women), and for women the hips at the widest point. Use a flexible tape, keep it level and snug without compressing the skin, and measure at the same time of day for consistency.
Frequently asked questions
How does this body fat calculator work?
It uses the U.S. Navy circumference method, which estimates body fat from tape measurements of your neck and waist (and hips for women) together with your height. It needs only a tape measure, no special equipment.
How accurate is it?
The Navy method is a practical estimate, typically within about 3 to 4 percentage points of lab methods like DEXA. Measure carefully and consistently for the best result.
Where do I measure?
Measure your neck below the larynx, your waist at the navel (for men) or the narrowest point (for women), and for women the hips at the widest point. Keep the tape snug but not compressing the skin.
What is a healthy body fat percentage?
It varies by sex and age. As a rough guide, fitness ranges are often around 14 to 24 percent for men and 21 to 31 percent for women, but consult a professional for guidance specific to you.
What is the Navy body fat method?
The Navy body fat method (also called the U.S. Navy circumference method) estimates body fat from simple tape-measure measurements: neck and waist for men, plus hips for women, along with your height. It was developed by the U.S. Navy as a quick, low-cost way to assess body fat without special equipment, and this calculator uses that formula.
How accurate is the Navy method calculator?
The Navy method is reasonably accurate for most people, typically within a few percent of more advanced methods like DEXA scans, as long as you measure carefully. It is a practical estimate rather than a precise clinical measurement, and works best for tracking changes over time.
What measurements do I need for the Navy body fat calculator?
You need your height, neck and waist measurements, and for women also the hips. Measure with a flexible tape, keep it snug but not tight, and measure at the same points each time for consistent results.
welanutria provides estimates for general information only and is not medical advice.