🧮 Body Fat Percentage Calculator

🧮 Body Fat Percentage Calculator

The Navy method uses neck, waist, and hip (for women) circumference measurements to determine body fat percentage. It is one of the most accurate methods without special equipment.

📐 Navy Method

For Men: 86.010×log10(waist−neck)−70.041×log10(height)+36.76

For Women: 163.205×log10(waist+hips−neck)−97.684×log10(height)−78.387

📊 Body Fat Statistics and Facts

💡 Practical Tips

• Measure Under the Same Conditions — always measure in the morning, on an empty stomach, before training. Hydration level can significantly affect the results.
• Aim for How You Feel, Not a Number — body fat percentage too low (<6% vyrams, <14% for women) can cause hormonal imbalance, reduce testosterone levels and the immune system.
• Combine Strength and Cardio Training — the most effective way to reduce fat: 3–4 strength workouts + 2–3 cardio sessions per week + a calorie deficit.
• Track Progress with Photos — take photos once a month under the same conditions. That is more objective than numbers alone.

How to Use the Body Fat Percentage Calculator

The calculator estimates body fat percentage from measurements — usually waist, neck and height (and for women also hip) circumferences. Measure the sites accurately: waist at the navel, neck below the Adam’s apple, hips at the widest point.

Measure in the morning, on an empty stomach, so fluids do not distort the result. Consistent measurements each time are more important than a perfect first number — consistency allows you to track change over time. Measure once every week or two, at the same time.

What the Result Shows

Body fat percentage shows what proportion of body weight is fat rather than muscle or bone. It is a much more informative indicator than weight alone: you can weigh the same but have a very different body composition. For athletes, this number helps track whether fat rather than muscle is being burned when losing weight, and whether excess fat is not increasing when gaining mass.

How to Interpret the Percentage

• Too Low — very low fat levels maintained for a long time can harm well-being, hormonal balance and immunity.
• Healthy Range — it is broad and depends on sex, age and goals; there is no single “correct” number.
• Too High — higher health risk over time, but it is worth changing gradually, without extreme diets.

Compare with your own previous measurements, not with other people's numbers. Related tools — body type and BMI.

Where the Limits of Measurement Lie

The circumference method is approximate: it does not distinguish subcutaneous fat from visceral fat and can be wrong due to measurement inaccuracies. The result is also affected by time of day, hydration and whether you have just eaten. More accurate methods, such as density or scan measurements, require equipment and specialists. Therefore, the most important thing is not the number itself but the direction in which it changes: measure consistently and track the trend. A small fluctuation between measurements is normal, so do not overemphasize a single number. What matters most is the long-term trend, not short-term fluctuations, which can be caused even by a single larger meal or a different measurement time. So do not compare individual days; look at the overall trend over weeks and months.

What to Do with the Result

If the percentage is far from your goal, do not rush to change everything at once. Set a realistic goal and move gradually — direction matters most, not speed. Combine calorie balance with strength training so that body composition changes in a healthy direction. And use the result as motivation: visible change often inspires more than the number on the scale.