Body Fat Calculator
Estimate body fat percentage using Navy, BMI, and Jackson-Pollock 3-site skinfold methods.
Free & unlimitedWorks offline
Not medical advice — estimates only. Consult a healthcare professional.
Units
Biological sex
Calculation method
Basic measurements
Weight (kg) (optional)
Age (optional)
Height (cm)
Navy measurements
Use a flexible tape measure. Keep tape level and snug, not tight.
Neck circumference (cm)
Waist circumference (cm)
Enter your measurements to calculate body fat
Fill in height, neck, and waist.
All processing happens in your browser. No data is sent to any server.
About this tool
- 1
Select method
Choose the US Navy method, which requires only a tape measure - no calipers needed.
- 2
Take measurements
Measure your neck circumference, waist circumference (at navel), and hips (women only) in cm or inches.
- 3
Enter height
Input your height for the body fat formula calculation.
- 4
View results
See your estimated body fat percentage, lean mass, fat mass, and fitness category.
- Measure at the same time of day (morning, before eating) for consistent tracking over time.
- The Navy method is an estimate - it is most accurate for people with average body proportions.
- For waist measurement, measure at the navel level, not at the narrowest point of the waist.
- US Navy body fat estimation method
- Supports both metric (cm/kg) and imperial (in/lbs) units
- Body fat category classification (essential, athletic, fit, average, obese)
- Lean body mass and fat mass calculations
- Historical tracking to monitor progress over time
- Tracking body composition changes during a fitness program
- Getting a body fat estimate without expensive equipment like DEXA scans
- Setting realistic body fat percentage goals for training
- Monitoring progress during a cut or bulk phase