Body Fat Calculator

Calculate your body fat percentage using proven methods including the US Navy formula and BMI-based estimation. Get detailed body composition analysis with health recommendations.

Body Fat Calculator

Enter your measurements to calculate body fat percentage using multiple methods

Gender *

Age (years)

Weight *

Height *

Navy Method Measurements

Waist Circumference *

Measure at the narrowest point

Neck Circumference *

Measure below the Adam's apple

Body Fat Categories

Men

Essential Fat:2-5%

Athletic:6-13%

Fitness:14-17%

Acceptable:18-24%

Obese:25%+

Women

Essential Fat:10-13%

Athletic:14-20%

Fitness:21-24%

Acceptable:25-31%

Obese:32%+

Calculation Methods

US Navy Method

More accurate, uses body measurements. Developed by the U.S. Navy for military personnel assessment.

BMI-based Method

Less accurate, uses height, weight, and age. Quick estimation using the Deurenberg formula.

Measurement Tips

Waist: Measure at the narrowest point, usually just above the hip bones.

Neck: Measure just below the Adam's apple, keep tape snug but not tight.

Hip (Women): Measure at the widest point of the hips.

Take measurements in the morning for most consistent results.

How to Use the Body Fat Calculator

Step-by-Step Instructions

Select Gender and Enter Age

Choose your biological gender and enter your age - these affect body fat calculation formulas.

Input Weight and Height

Enter your current weight and height. Toggle between metric (kg/cm) and imperial (lbs/in) units as needed.

Measure Waist and Neck

Measure waist at narrowest point and neck just below Adam's apple. Use a flexible measuring tape.

Add Hip Measurement (Women)

Women need to measure hip circumference at the widest point for accurate Navy method calculation.

Choose Calculation Method

Select Navy Method (more accurate) or BMI Method (simpler) based on available measurements.

Review Body Composition

Analyze your body fat percentage, category, and body composition breakdown.

Pro Tips for Accurate Measurements

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Consistent timing: Take measurements at the same time of day, preferably in the morning before eating.

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Proper tape position: Keep measuring tape snug but not tight - it should not indent the skin.

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Multiple measurements: Take 2-3 measurements of each area and use the average for best accuracy.

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Navy method accuracy: US Navy method is more reliable than BMI-based estimation for body composition.

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Health context: Consider results alongside overall health - consult healthcare providers for medical advice.

Frequently Asked Questions

How accurate is the US Navy body fat calculation?

The US Navy method is considered one of the most accurate non-invasive body fat measurement techniques, with accuracy within 3-4% when measurements are taken correctly. It's more reliable than BMI for assessing body composition.

What's the difference between the Navy method and BMI method?

The Navy method uses actual body measurements (waist, neck, hip) to calculate body fat, making it more accurate. The BMI method is a quick estimation based on height, weight, and age, but doesn't account for muscle mass or body composition.

Why do women need hip measurements but men don't?

Women typically store more fat in the hip and thigh areas due to hormonal differences. The hip measurement helps account for this natural fat distribution pattern, making the calculation more accurate for women.

What's considered a healthy body fat percentage?

For men, 14-17% is considered fitness level, while 18-24% is acceptable. For women, 21-24% is fitness level, and 25-31% is acceptable. Essential fat levels are 2-5% for men and 10-13% for women.

How often should I measure my body fat percentage?

For tracking fitness progress, measure monthly or bi-weekly. Daily fluctuations can occur due to hydration, food intake, and time of day. Always measure under similar conditions for consistency.

Medical Disclaimer

This body fat calculator is for informational purposes only and should not replace professional medical advice. Results may vary based on individual factors. Consult with a healthcare provider or certified fitness professional for personalized health and fitness guidance, especially if you have medical conditions or concerns.