Body Fat Percentage Calculator – Free Body Fat % Estimator (2026)
Body Fat % Calculator
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Uses the U.S. Navy circumference method. Measure with a soft tape, snug but not tight.
What Is Body Fat Percentage?
Body fat percentage tells you what portion of your total body weight is fat, as opposed to muscle, bone, water, and organs. Unlike BMI, which only looks at weight relative to height, body fat percentage gives a more accurate picture of your actual body composition - which is why it's often preferred by athletes, trainers, and anyone tracking fitness progress.
How This Calculator Works
This tool uses the U.S. Navy circumference method, a widely used tape-measurement formula that estimates body fat using neck, waist, hip (for women), and height measurements. It's not as precise as a DEXA scan or hydrostatic weighing, but it's a reliable, equipment-free way to track changes over time.
Body Fat Percentage Categories
| Category | Men | Women |
|---|---|---|
| Essential fat | 2-5% | 10-13% |
| Athletes | 6-13% | 14-20% |
| Fitness | 14-17% | 21-24% |
| Average | 18-24% | 25-31% |
| Obese | 25%+ | 32%+ |
Source: American Council on Exercise (ACE) body fat categorization.
Tips for Accurate Measurement
Measure first thing in the morning before eating or drinking. Keep the tape snug against the skin without compressing it. Take each measurement twice and use the average for the most reliable result.
Know your body fat? Next, set your daily protein target with the Protein Intake Calculator.
Frequently Asked Questions
How accurate is the Navy method?
It's generally accurate within 3-4% of more advanced methods like DEXA scans, making it a solid option for tracking progress at home.
Why does the calculator ask for hip measurement only for women?
The U.S. Navy formula uses different variables for men and women because fat distribution patterns differ by sex; the female formula includes hip circumference for better accuracy.
What is a healthy body fat percentage?
For most adults, 10-20% for men and 18-28% for women is considered a healthy, average range depending on age and fitness level.
Is body fat percentage more useful than BMI?
Body fat percentage gives a more direct measure of body composition, while BMI is a quicker general screening tool. Using both together gives a fuller picture of your health.
Knowing your body fat percentage is a great starting point - pair it with our guide on calorie deficits explained to turn that number into an actual weight loss plan.
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