Female Body Fat Calculator
This calculator uses the U.S. Navy circumference method for women.
What this calculator tells you
Your body fat percentage estimates how much of your total body weight comes from fat tissue. Unlike BMI, body fat gives a more direct look at body composition. For women, this is often a better metric for tracking fitness, health, and weight-loss progress.
This tool estimates body fat from tape measurements and gives a category to help interpret your result.
How the female body fat formula works
This calculator uses the U.S. Navy method for women, which is based on:
- Height
- Neck circumference
- Waist circumference
- Hip circumference
The equation used is:
Body Fat % = 163.205 × log10(waist + hip − neck) − 97.684 × log10(height) − 78.387
For metric inputs, measurements are converted to inches before calculation.
How to measure correctly
1) Height
Stand barefoot against a wall, heels together, and look straight ahead. Measure from floor to the top of your head.
2) Neck
Wrap the tape around your neck just below the larynx. Keep tape level and snug, not tight.
3) Waist
Measure at the narrowest point of your torso (usually above the navel). Exhale gently and relax your abdomen before reading the tape.
4) Hips
Measure at the widest part of your hips and buttocks while standing naturally.
How to interpret female body fat percentage
- 10–13%: Essential fat
- 14–20%: Athlete range
- 21–24%: Fitness range
- 25–31%: Average range
- 32%+: Obesity range
These ranges are general guidelines. Individual health status can vary based on age, genetics, hormonal status, muscle mass, and medical history.
Using your result effectively
Use the same method every time, under similar conditions (time of day, hydration, and tape placement). Track trends over weeks rather than stressing over single-day changes.
- Re-check every 2 to 4 weeks
- Pair body fat with waist and weight trends
- Focus on sustainable nutrition and strength training
Limitations of body fat calculators
No tape-based formula is perfect. Measurement error of even 0.5 inches can shift your result. The calculator is best used as a progress tool, not a diagnosis.
If you need medical-grade analysis, ask your clinician about DEXA, Bod Pod, or hydrostatic testing.
Frequently asked questions
Is this calculator accurate for everyone?
It is reasonably accurate for many adults but may be less accurate for very lean athletes, pregnancy, edema, or unusual fat distribution patterns.
Can I use this if I only know metric measurements?
Yes. Select metric mode and enter centimeters and kilograms.
Should I use BMI or body fat percentage?
Both can be useful. BMI is quick for population screening; body fat percentage is better for individual composition tracking.
Medical disclaimer: This tool is for educational use and does not replace personalized medical advice.