Body Fat Calculator | Accurate Body Fat Percentage Estimation

Body Fat Percentage Calculator

Calculate your body fat percentage using the U.S. Navy method and BMI method. Get accurate results with measurements in metric or imperial units.

Metric Units

Imperial Units

Gender:

Male

Female

Age:

Height (cm):

Measure to the nearest 0.5 cm

Weight (kg):

Neck Circumference (cm):

Measure below the larynx

Waist Circumference (cm):

Measure at the navel level

Gender:

Male

Female

Age:

Height (inches):

Measure to the nearest 1/4 inch

Weight (lbs):

Neck Circumference (inches):

Measure below the larynx

Waist Circumference (inches):

Measure at the navel level

Body Fat Percentage Scale

Essential Fat

Athletes

Fitness

Acceptable

Obese

Your result: 18.5% – Fitness category

Understanding Body Fat Percentage

U.S. Navy Method

The U.S. Navy body fat formula is considered one of the most accurate ways to measure body fat without specialized equipment.

This method uses circumference measurements at specific points on the body to estimate body fat percentage.

Formula for men:
%BodyFat = 86.010 × log₁₀(abdomen – neck) – 70.041 × log₁₀(height) + 36.76

Formula for women:
%BodyFat = 163.205 × log₁₀(waist + hip – neck) – 97.684 × log₁₀(height) – 78.387

BMI Method

The BMI method estimates body fat based on Body Mass Index, age, and gender.

This method is less accurate than the Navy method as it doesn’t account for muscle mass or body composition.

Formula:
Body Fat % = (1.20 × BMI) + (0.23 × Age) – (10.8 × gender) – 5.4

Where gender = 1 for male and 0 for female.

BMI = weight (kg) / [height (m)]²

Measurement Tips

For accurate results:

Measure in the morning before eating or drinking
Use a flexible, non-stretch tape measure
Measure directly against the skin, not over clothing
Ensure the tape is level and parallel to the floor
Take measurements at the end of a normal exhale
For waist: measure at the navel level
For neck: measure below the larynx with tape sloping downward
For hips: measure at the widest point

Body Fat Categories

For Men

Essential Fat: 2-5%
Athletes: 6-13%
Fitness: 14-17%
Acceptable: 18-24%
Obese: 25%+

Essential fat is necessary for normal physiological function. Athletes typically have lower body fat for optimal performance.

For Women

Essential Fat: 10-13%
Athletes: 14-20%
Fitness: 21-24%
Acceptable: 25-31%
Obese: 32%+

Women naturally have higher essential fat percentages due to physiological differences including child-bearing capabilities.

Health Implications

Maintaining a healthy body fat percentage is crucial for overall health:

Too low: May cause hormonal imbalances, decreased immunity, and reproductive issues
Ideal range: Associated with optimal health, energy, and longevity
Too high: Increases risk of heart disease, diabetes, and other health problems

Consult with a healthcare provider for personalized health advice.