Estimate Your Body Fat %
Use the U.S. Navy circumference method for a quick body fat estimate. Enter measurements carefully for the best accuracy.
Note: This is an estimate, not a medical diagnosis.
What this body fat estimate tells you
Scale weight alone does not show body composition. Two people can weigh the same but have very different amounts of fat and lean tissue. A body fat estimate gives better context by approximating what percentage of your total body mass is fat.
This calculator uses the U.S. Navy method, which is based on circumference measurements. It is popular because it is simple, affordable, and easy to repeat over time. While not as precise as clinical tests such as DEXA, it is usually good enough for tracking progress when measurements are taken consistently.
How to measure correctly
Accuracy starts with consistent measuring technique. Use a flexible tape measure and follow these tips:
- Measure at the same time of day, ideally in the morning.
- Keep tape snug against the skin without compressing tissue.
- Stand naturally and breathe normally (don’t suck in your stomach).
- Take each measurement 2–3 times and use the average.
Measurement landmarks
- Height: barefoot, standing upright against a wall.
- Neck: just below the larynx (Adam’s apple area), tape slightly angled down at front for males if needed.
- Waist: around the abdomen at the level of the navel (belly button) for this method.
- Hip (females): widest point of the hips/glutes.
Body fat categories (general reference)
After calculating, your result is grouped into a category. These ranges are common fitness references and are not a diagnosis:
For males
- Essential fat: 2–5%
- Athletes: 6–13%
- Fitness: 14–17%
- Average: 18–24%
- Obese: 25%+
For females
- Essential fat: 10–13%
- Athletes: 14–20%
- Fitness: 21–24%
- Average: 25–31%
- Obese: 32%+
How to use your result wisely
A single reading is less important than the trend. If your estimate goes down slowly while strength, energy, and recovery remain good, that is often a strong sign your plan is working. Consider tracking these together:
- Body fat estimate every 2–4 weeks
- Scale weight 3–7 times per week (weekly average)
- Waist circumference weekly
- Strength performance in key lifts
- Sleep quality and energy levels
Improving body composition: practical strategy
Nutrition
Prioritize adequate protein, mostly whole foods, and calorie awareness. For fat loss, a moderate calorie deficit is usually more sustainable than aggressive cuts. For lean gain, a small calorie surplus with structured training works best.
Training
Resistance training should be the backbone of your plan. It helps preserve or build muscle while body fat changes. Add cardio for heart health, conditioning, and additional calorie expenditure.
Recovery
Sleep and stress management matter more than most people think. Chronic poor sleep can impair appetite control, training output, and recovery.
Limitations and important disclaimer
Circumference-based methods can be affected by body shape, hydration, measurement errors, and recent meals. Use this tool for educational tracking only. If you need a clinical assessment or personalized medical guidance, consult a qualified healthcare professional.