What is a healthy body fat percentage?

Reference ranges vary by sex. For males, 14-17% is considered fitness level, 18-24% is acceptable. For females, 21-24% is fitness level, 25-31% is acceptable. These are general reference values from the American Council on Exercise.

How accurate is the US Navy body fat formula?

The US Navy formula provides a reasonable estimate for most people but has limitations. Accuracy depends on measurement technique and body type. For clinical accuracy, DEXA scanning is the gold standard.

📏 Body Fat Calculator

Estimate body fat percentage using the US Navy formula

Waist (cm)

Neck (cm)

Height (cm)

Your estimated body fat

15.4%

Fitness

Body Fat Range

0%15%25%35%50%

Fat Mass

15.4%

Lean Mass

84.6%

Body Fat Calculator Guide

This calculator uses the US Navy Method to estimate body fat percentage by measuring waist, neck, and height circumference. It's one of the most commonly used and convenient home measurement methods — all you need is a measuring tape.

Body Fat Percentage is the proportion of fat mass to total body weight. It's a more accurate indicator of health and fitness than BMI. Two people with the same BMI can have very different body fat percentages — one might be "skinny fat" (high fat, low muscle) while the other is fit (low fat, high muscle).

Body Fat Standards and Health Assessment

[Male Body Fat Classification] - Essential fat: 2%-5% (minimum for basic physiological function) - Athletes: 6%-13% (competitive level, visible abs) - Fitness: 14%-17% (lean with moderate muscle definition) - Acceptable: 18%-24% (normal range for general population) - Obese: 25%+ (increased health risks)

[Female Body Fat Classification] - Essential fat: 10%-13% (women need more fat for hormonal balance) - Athletes: 14%-20% (competitive athlete level) - Fitness: 21%-24% (lean and healthy) - Acceptable: 25%-31% - Obese: 32%+

Important: Women naturally have 6-10 percentage points more body fat than men — this is a normal physiological difference. Women below 17% body fat may experience menstrual irregularity and bone density issues.

[Body Fat vs BMI] Same BMI but different body fat = very different health risks: - BMI 24 + 18% body fat → healthy "muscular build" - BMI 24 + 30% body fat → concerning "skinny fat"

Scientific Methods to Reduce Body Fat

The core principle of fat loss is creating a calorie deficit — burning more calories than you consume. Here's an evidence-based approach:

[Diet] 1. Control total calories: Daily intake = TDEE - 300~500 kcal 2. Increase protein: 1.6-2g per kg body weight to prevent muscle loss 3. Reduce refined carbs: Replace white rice and pasta with brown rice, oats 4. Increase vegetables: Provide satiety and micronutrients 5. Cut sugar and limit alcohol: Sugary drinks are a major fat-gain driver

[Exercise] 1. Cardio: 150+ minutes per week of moderate-intensity (running, swimming, cycling) 2. Strength training: 2-3 full-body sessions per week to boost metabolism 3. HIIT (High-Intensity Interval Training): Time-efficient fat burning 4. Increase daily activity: Walk more, take stairs, use a standing desk

[Common Mistakes] × Spot reduction doesn't exist — you can't lose fat from just one area × Skipping dinner is counterproductive — leads to metabolic slowdown and binge eating × Cardio-only without strength training — can result in "skinny fat" √ Be patient — healthy fat loss rate is 0.5-1 kg per week

This calculator is for reference only and does not constitute medical advice.

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Body Fat Calculator Guide

Body fat percentage is the proportion of fat mass to total body weight. Unlike BMI, body fat percentage directly reflects the actual fat content in the body, making it a more precise indicator for classification purposes.

This calculator uses the US Navy body fat formula, developed in 1984, which estimates body fat percentage based on waist, neck, and height measurements (plus hip for females). While not as precise as DEXA scans or hydrostatic weighing, it provides a practical estimation for general reference.

US Navy Body Fat Formula

Male body fat = 495 / (1.0324 - 0.19077×log10(waist-neck) + 0.15456×log10(height)) - 450

Female body fat = 495 / (1.29579 - 0.35004×log10(waist+hip-neck) + 0.22100×log10(height)) - 450

All measurements in centimeters (cm).

Body Fat Classification Reference

Body fat classification (American Council on Exercise):

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

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

Essential fat is the minimum amount needed for basic physiological function. Females have higher essential fat due to hormonal and reproductive functions.

Body Fat Calculation Examples

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Example 1: 30-year-old male Input: waist=88cm, neck=38cm, height=178cm Estimated body fat ≈ 22.5% Classification: Acceptable range Lean mass: 77.5% Example 2: 28-year-old female Input: waist=68cm, hip=95cm, neck=32cm, height=165cm Estimated body fat ≈ 24.0% Classification: Fitness level

Measurement Tips

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For best results: • Use a flexible tape measure with consistent tension • Waist: measure at navel level (standing, end of exhale) • Neck: measure at the narrowest point below the larynx • Hip: measure at the widest point of the buttocks • Take measurements at the same time of day • Average multiple measurements for better accuracy Limitations of the US Navy formula: • Accuracy depends on measurement technique • May not be accurate for extremely muscular or obese individuals • Not suitable for pregnant women

Common Use Cases

- Tracking body composition changes over time
- Estimating fat loss progress alongside weight monitoring
- Comparing body fat percentage with BMI for a more complete picture
- Setting reference points for fitness goals

Body Fat vs BMI

BMI and body fat percentage measure different things:

• A muscular athlete may have a high BMI (due to muscle weight) but low body fat • A sedentary individual may have a normal BMI but high body fat ("skinny fat")

Body fat percentage provides a more direct measure of body composition. However, BMI remains useful as a quick screening tool. Using both metrics together gives the most complete picture.

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