Know Your
Body Fat Percentage
Everything you need to understand, calculate, and improve your body fat percentage.
Tools and Guides
Calculate your body fat, compare it against reference charts, and learn what the numbers mean for your health and fitness.
Calculator
Find your body fat percentage with the free Navy method calculator.
Body Fat Chart
Visual reference chart with ACE categories for men and women.
Women
Healthy ranges, averages by age, and measurement tips for women.
Men
Healthy body fat ranges, abs visibility thresholds, and guides for men.
Abs
What body fat percentage you need to see abs for men and women.
How to Measure
Compare 5 measurement methods by accuracy, cost, and convenience.
How to Lower Body Fat
Evidence-based guide to lowering your body fat percentage safely.
What Is Body Fat Percentage?
Body fat percentage is the proportion of your total body weight that is made up of fat tissue. It is expressed as a percentage. For example, if you weigh 180 pounds and have 30 pounds of fat, your body fat percentage is 16.7%.
Unlike BMI (Body Mass Index), which only considers height and weight, body fat percentage directly measures your body composition. Two people with the same BMI can have very different body fat levels. A muscular athlete and a sedentary person might both have a BMI of 27, but their body fat percentages could differ by 15% or more.
This makes body fat percentage a far more useful metric for understanding your health, fitness level, and physical appearance. You can calculate your body fat percentage using our free calculator, or view the body fat percentage chart to see where different ranges fall.
Why Body Fat Percentage Matters
Tracking your body fat percentage gives you a more complete picture of your health than the scale alone. Here is why it matters:
Health risk assessment
High body fat is linked to increased risk of heart disease, type 2 diabetes, hypertension, and certain cancers. Knowing your body fat percentage helps you understand your metabolic health independent of what the scale says.
Fitness progress tracking
When you start exercising, you may gain muscle and lose fat simultaneously. The scale might not move, but your body fat percentage will drop. This makes it a better metric for tracking real progress.
Goal setting
Whether you want to see your abs, improve athletic performance, or simply reach a healthier weight, body fat percentage gives you a concrete, meaningful target that is more useful than a number on the scale.
Nutritional planning
Your lean body mass determines your protein needs and basal metabolic rate. Knowing your body fat percentage lets you calculate these more accurately.
Body Fat Percentage Categories
The American Council on Exercise (ACE) classifies body fat into five categories based on sex[1]. These are the most widely used reference ranges in the fitness industry.
Men
| Essential Fat | 2–5% |
| Athletes | 6–13% |
| Fitness | 14–17% |
| Average | 18–24% |
| Obese | 25%+ |
Women
| Essential Fat | 10–13% |
| Athletes | 14–20% |
| Fitness | 21–24% |
| Average | 25–31% |
| Obese | 32%+ |
For a detailed visual comparison, visit the body fat percentage chart. For gender-specific guides, see our pages on body fat percentage for women and body fat percentage for men.
How to Measure Body Fat Percentage
Five main methods are used to measure body fat percentage, from free at-home techniques to clinical lab tests. The U.S. Navy tape method (free, accurate to within 1–3%) is the best balance for home use. DEXA scans ($50–150) are the clinical gold standard.
U.S. Navy Tape Method
Uses neck, waist, and height measurements with a validated formula. Best balance of accuracy, cost, and convenience.
DEXA Scan
Clinical gold standard. Uses low-dose X-rays to map body composition including bone density and regional fat.
For a full breakdown of all 5 methods (Navy, skinfolds, BIA, DEXA, hydrostatic) including step-by-step instructions for measuring at home, see our complete guide on how to measure body fat percentage. Or use our free Navy method calculator to get started immediately.
Healthy Body Fat Percentage Ranges
What constitutes a "healthy" body fat percentage depends on your sex, age, and goals. Here are the ideal body fat percentages by age according to Jackson and Pollock research data[2]:
| Age | 20 | 25 | 30 | 35 | 40 | 45 | 50 | 55 |
| Men | 8.5% | 10.5% | 12.7% | 13.7% | 15.3% | 16.4% | 18.9% | 20.9% |
| Women | 17.7% | 18.4% | 19.3% | 21.5% | 22.2% | 22.9% | 25.2% | 26.3% |
Note: ideal body fat naturally increases with age as part of healthy aging. These values represent the midpoint of healthy ranges from the Jackson & Pollock research data.
Frequently Asked Questions
Sources
- [1]American Council on Exercise (ACE). ACE Personal Trainer Manual. ACE, San Diego, CA.
- [2]Jackson, A.S., & Pollock, M.L. (1978). Generalized equations for predicting body density of men. British Journal of Nutrition, 40(3), 497–504.