Calculate Your Body Fat Percentage
Estimate your body fat using scientifically validated formulas: CUN-BAE, U.S. Navy, BMI, and Jackson-Pollock. Get your body fat category, lean mass, and personalized weight goals.
4 methods
From quick estimates to tape and skinfold workflows
Private by design
Measurements stay in the browser and recent history stays local
Built for comparison
Switch methods and units without losing context
Enter Your Details
Most popular. Uses BMI, age, and sex for a reasonable estimate. Accuracy: ~4.7%
Estimated Body Fat
Fill in your measurements on the left to see your body fat estimate.
Recent calculations
Stored locally on this device only.
Your latest successful results will appear here for quick comparison.
Why Trust MyFatCalc?
Peer-Reviewed Formulas
All calculations are based on published research from the Naval Health Research Center, CUN-BAE study, and ACE standards.
Multiple Methods
Choose from 4 validated methods depending on what measurements you have available.
Private & Free
No account required. All calculations happen in your browser. Your data never leaves your device.
Quick Guide
CUN-BAE
Best default. Just height, weight, age, and gender.
U.S. Navy
Most accurate. Needs tape measurements.
BMI
Simplest estimate. Less accurate for muscular people.
Jackson-Pollock
Needs skinfold calipers. Great for home tracking.
Understanding Body Fat Percentage
Body fat percentage is the proportion of your total body weight that is made up of fat tissue. Unlike BMI, which only considers height and weight, body fat percentage gives you a more accurate picture of your body composition.
Why Body Fat Matters
Your body needs some fat to function properly. This is called essential fat. It helps regulate hormones, insulates your body, and protects vital organs. However, excess body fat, especially visceral fat around your organs, is linked to increased risk of heart disease, type 2 diabetes, and other health conditions.
How Accurate Are These Calculators?
Each method has a different margin of error. The U.S. Navy method is generally the most accurate tape-measure approach. The CUN-BAE method offers a good balance of accuracy and convenience. For the most precise measurement, methods like DEXA scans or hydrostatic weighing are required in a clinical setting.
How to Measure Correctly
For Tape Measure Methods
- Use a non-stretchable tape measure
- Measure against bare skin
- Keep tape parallel to the floor
- Do not compress the skin
- Take measurements in the morning
For Skinfold Methods
- Use professional calipers if possible
- Pinch skin and subcutaneous fat, not muscle
- Take 2-3 measurements per site and average
- Measure from the right side of the body
- Have someone help with hard-to-reach areas