What is body fat percentage?

Body fat percentage is the proportion of fat mass to total body weight. It is an important indicator of health and body composition, more meaningful than body weight alone.

What is the U.S. Navy body fat formula?

The U.S. Navy body fat formula is a body fat estimation method based on body circumference measurements. Men use waist and neck measurements, women use waist, hip and neck measurements for calculation with high accuracy.

What are healthy body fat percentage ranges?

Healthy body fat ranges: Men 6-25%, Women 14-32%. Athletes and fitness enthusiasts typically have lower body fat percentages, but too low or too high is not healthy.

Body Fat Calculator | Body Fat Percentage Online Calculator

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Body Fat Calculator

Calculate body fat percentage using the U.S. Navy method

Gender

Age

Weight (kg)

Height (cm)

Waist (cm)

Neck (cm)

Algorithm Principles & Formulas

U.S. Navy Body Fat Formula

Male Formula

BF% = 495 / (1.0324 - 0.19077 × log10(waist - neck) + 0.15456 × log10(height)) - 450

Female Formula

BF% = 495 / (1.29579 - 0.35004 × log10(waist + hip - neck) + 0.22100 × log10(height)) - 450

BMI Calculation

BMI = Weight(kg) / Height(m)²

Body Composition Calculation

Body Fat Mass

Body Fat Mass = Weight × Body Fat % / 100

Lean Body Mass

Lean Body Mass = Weight - Body Fat Mass

Body Fat Range

2% ≤ Body Fat % ≤ 50%

Calculation Process (Calculator Input → Process → Result)

Input Stage

• Gender selection
• Age, weight, height
• Waist, neck measurements
• Hip measurement (female)

Calculation Process

• Validate input data
• Select formula by gender
• Calculate body fat percentage
• Calculate body composition

Output Results

• Body fat percentage
• Body fat mass
• Lean body mass
• BMI and category

Example Calculations

Male Example

Input Data:

• Age: 30 years

• Weight: 75 kg

• Height: 175 cm

• Waist: 85 cm

• Neck: 38 cm

Calculation Results:

• Body Fat %: 18.5%

• Body Fat Mass: 13.9 kg

• Lean Body Mass: 61.1 kg

• BMI: 24.5 (Normal weight)

Female Example

Input Data:

• Age: 28 years

• Weight: 60 kg

• Height: 165 cm

• Waist: 70 cm

• Neck: 32 cm

• Hip: 95 cm

Calculation Results:

• Body Fat %: 22.3%

• Body Fat Mass: 13.4 kg

• Lean Body Mass: 46.6 kg

• BMI: 22.0 (Normal weight)

Important Note: The body fat calculator provides estimates. Actual body fat percentage may vary due to individual differences. Consider using professional equipment for more accurate measurements.

Health Applications & Body Fat Management

Fitness Training Guidance

Understanding body fat percentage is crucial for developing fitness plans:

• Adjust training intensity based on body fat
• Set fat loss or muscle gain goals
• Monitor training progress
• Optimize nutrition intake plans

Health Risk Assessment

Body fat percentage is an important indicator for health risk assessment:

• Assess cardiovascular disease risk
• Monitor metabolic health status
• Prevent obesity-related diseases
• Guide lifestyle adjustments

Nutrition Management

Body fat-based nutrition management strategies:

• Calculate basal metabolic rate
• Develop personalized diet plans
• Adjust macronutrient ratios
• Optimize fat loss or muscle gain

Body Fat Percentage Standards

Male Body Fat Categories:

Essential Fat: 2-5%

Athletes: 6-13%

Fitness: 14-17%

Average: 18-24%

Obese: 25%+

Female Body Fat Categories:

Essential Fat: 10-13%

Athletes: 14-20%

Fitness: 21-24%

Average: 25-31%

Obese: 32%+

Usage Recommendations

• Regularly measure body fat trends
• Combine with other health indicators
• Measure under consistent conditions
• Focus on long-term changes
• Consult professionals for guidance

Frequently Asked Questions

Q: Is lower body fat percentage always better?

A: No. Too low body fat can affect physiological functions. Women may experience menstrual cycle issues, men may have hormone level problems. Maintaining body fat within healthy ranges is most important.

Q: How to reduce body fat percentage?

A: Control calorie intake through proper diet, combine cardio and strength training, maintain adequate sleep and stress management, gradually reduce body fat percentage.

Body Fat Calculator Application Guide

Fitness Enthusiast Applications

For fitness enthusiasts, body fat percentage is a key metric for measuring training effectiveness. By regularly measuring body fat percentage, you can evaluate the success of fat loss or muscle gain programs, adjust training intensity and nutrition strategies. The body fat calculator helps fitness enthusiasts establish scientific body management methods, avoiding blind pursuit of weight changes while neglecting body composition improvements.

Health Management Applications

Body fat percentage is an important parameter for assessing overall health status, closely related to cardiovascular disease, diabetes and other chronic disease risks. Through the body fat calculator, individuals can regularly monitor body fat levels, identify health risks early, and take appropriate preventive measures. This is particularly important for middle-aged and elderly people and those with family medical history.

Nutritionist Professional Applications

Nutritionists can use the body fat calculator to develop personalized nutrition plans for clients. By understanding clients' body fat percentage and body composition, they can more accurately calculate basal metabolic rate and daily energy requirements, develop suitable dietary plans. Changes in body fat percentage are also important indicators for evaluating nutrition intervention effectiveness.

Sports Medicine Applications

In sports medicine, body fat percentage is an important reference for assessing athlete physical condition and developing training plans. Different sports have different body fat requirements. Through the body fat calculator, coaches and medical teams can quickly assess athlete body composition, providing scientific basis for optimizing training programs and recovery strategies.