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Body Fat Percentage Calculator

Calculate your body fat percentage

Body Fat Percentage

16.9%

Category

Fitness

Lean Body Mass

146.3 lbs

Fat Mass

29.7 lbs

Units

Body Fat Percentage

16.9%

Category

Fitness

Lean Mass

146.3 lbs

Fat Mass

29.7 lbs

Body Fat Categories

Essential Fat: <6%
Athletic: 6-13%
Fitness: 14-17%
You
Average: 18-24%
Obese: 25%+
0%16.9%35%

Frequently Asked Questions

Q

How do you calculate body fat percentage?

Body fat percentage is calculated using the US Navy method, which uses measurements of waist, neck, hip (for women), height, and weight. The formula accounts for gender differences and provides accurate estimates for most people.

  • US Navy method accuracy is within 3–4% of DEXA scan results for most people
  • Measure waist at navel level, neck at narrowest point, hips at widest point
  • Take measurements in the morning before eating for consistency
  • Use a flexible cloth tape – keep snug but not compressing the skin
  • Measure 3 times and average the readings for best accuracy
Q

What is a healthy body fat percentage?

Healthy body fat ranges: Men: Essential (2-5%), Athletes (6-13%), Fitness (14-17%), Average (18-24%), Obese (25%+). Women: Essential (10-13%), Athletes (14-20%), Fitness (21-24%), Average (25-31%), Obese (32%+).

  • Essential fat (men 2–5%, women 10–13%) is needed for organ function
  • Athletic range (men 6–13%, women 14–20%) requires dedicated training and diet
  • Fitness range (men 14–17%, women 21–24%) is a realistic goal for active adults
  • Visible abs typically appear at 10–14% for men and 16–20% for women
  • Dropping below essential fat levels risks hormonal disruption and bone loss
CategoryMenWomen
Essential Fat2–5%10–13%
Athletes6–13%14–20%
Fitness14–17%21–24%
Average18–24%25–31%
Obese25%+32%+
Q

What is the difference between body fat and BMI?

BMI measures weight relative to height but doesn't account for muscle mass. Body fat percentage measures actual fat vs lean tissue. A muscular person can have high BMI but low body fat, while someone with normal BMI may have high body fat.

  • BMI formula: weight(kg) / height(m)² – ignores body composition entirely
  • A 200 lb muscular athlete at 5'10" has BMI 28.7 (overweight) but may have 12% body fat
  • A 150 lb sedentary person at 5'10" has BMI 21.5 (normal) but may have 28% body fat
  • Body fat % requires measurements (waist, neck, hips) but gives much more useful data
  • DEXA scan ($75–150) is the gold standard for measuring both bone density and body fat
Q

How can I reduce body fat percentage?

To reduce body fat: 1) Calorie deficit (burn more than you consume), 2) Strength training (builds muscle), 3) Cardio exercise, 4) High-protein diet, 5) Adequate sleep, 6) Reduce processed foods, 7) Be patient (1-2% per month is realistic).

  • Target a 500 calorie/day deficit for ~1 lb fat loss per week
  • Eat 0.7–1.0 g protein per lb of body weight to preserve muscle mass
  • Strength train 3–4 days/week – muscle raises resting metabolic rate by 6–7 cal/lb/day
  • Get 7–9 hours of sleep – sleep deprivation increases cortisol and fat storage
  • Realistic fat loss: 1–2% body fat per month; crash dieting loses muscle, not just fat

Example Calculations

1Male Body Fat (176 lbs, 69 in, Waist 33.5 in, Neck 15 in)

Inputs

GenderMale
Weight176 lbs
Height69 in (175.3 cm)
Waist33.5 in (85.1 cm)
Neck15 in (38.1 cm)

Result

Body Fat16.9%
CategoryFitness
Lean Body Mass146.3 lbs
Fat Mass29.7 lbs

All inputs converted to cm: waist = 85.09, neck = 38.1, height = 175.26. BF% = 495 / (1.0324 - 0.19077 × log10(46.99) + 0.15456 × log10(175.26)) - 450 = 495 / 1.0601 - 450 = 16.9%. Fat mass = 176 × 0.169 = 29.7 lbs. Lean mass = 146.3 lbs.

2Female Body Fat (140 lbs, 64 in, Waist 28 in, Neck 12.5 in, Hip 37 in)

Inputs

GenderFemale
Weight140 lbs
Height64 in (162.6 cm)
Waist28 in (71.1 cm)
Neck12.5 in (31.8 cm)
Hip37 in (94.0 cm)

Result

Body Fat25.7%
CategoryAverage
Lean Body Mass104.0 lbs
Fat Mass36.0 lbs

Converted to cm: waist = 71.12, hip = 93.98, neck = 31.75, height = 162.56. BF% = 495 / (1.29579 - 0.35004 × log10(133.35) + 0.22100 × log10(162.56)) - 450 = 495 / 1.0406 - 450 = 25.7%. Fat = 140 × 0.257 = 36.0 lbs. Lean = 104.0 lbs.

Formulas Used

US Navy Method (Men)

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

US Navy body fat formula for men. All measurements in centimeters.

Where:

waist= Waist circumference in cm (at navel)
neck= Neck circumference in cm (narrowest point)
height= Height in cm

US Navy Method (Women)

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

US Navy body fat formula for women, includes hip measurement.

Where:

waist= Waist circumference in cm
hip= Hip circumference in cm (widest point)
neck= Neck circumference in cm
height= Height in cm

Understanding Body Fat Percentage

1

US Navy Method: How the Formula Works

The US Navy body fat formula uses circumference measurements — waist, neck, and hip (women only) — combined with height to estimate body fat within ±3–4% of DEXA scan results. For men: BF% = 495 / (1.0324 – 0.19077 × log10(waist – neck) + 0.15456 × log10(height)) – 450. Women use a separate formula that adds hip circumference to account for gender-specific fat distribution.

Accuracy depends on consistent measurement technique. Measure waist at navel level (not the narrowest point), neck at the narrowest circumference below the larynx, and hips at the widest point. A 1 cm measurement error can shift results by 1–2 percentage points, so take 3 readings and average them.

The Navy method was developed for military fitness assessment and validated against hydrostatic weighing across thousands of service members. While less precise than DEXA ($50–$150 per scan, ±1–2% accuracy), it costs nothing and can be done at home with a $5 cloth measuring tape. Use the BMI calculator alongside for a quick complementary check, but body fat % gives far more actionable data.

Measure in the morning before eating, at the same time each week, for the most consistent tracking results.

2

Body Fat Categories: From Essential to Obese

Essential fat is 2–5% for men and 10–13% for women — the minimum needed for organ function, hormone production, and nerve insulation. Dropping below these thresholds causes hormonal disruption, bone density loss, and immune suppression. Competitive bodybuilders reach 3–5% (men) only briefly for contests, not as a sustainable lifestyle.

The athletic range (men 6–14%, women 14–20%) requires dedicated training and nutrition. Visible abdominal definition typically appears at 10–14% for men and 16–20% for women. The fitness range (men 14–17%, women 21–24%) represents a realistic long-term goal for regular exercisers without extreme dietary restriction.

Average body fat (men 18–24%, women 25–31%) describes most adults who are moderately active. Above these ranges enters the obese category (men 25%+, women 32%+), where metabolic disease risk increases significantly. The Body Roundness Index calculator adds visceral fat context that body fat percentage alone cannot distinguish.

CategoryMenWomenHealth Implication
Essential Fat2–5%10–13%Minimum for survival
Athletes6–14%14–20%Peak performance range
Fitness14–17%21–24%Sustainable active lifestyle
Average18–24%25–31%Typical for moderate activity
Obese25%+32%+Elevated metabolic disease risk
3

Body Fat % vs BMI: Why Composition Matters More

A 200 lb muscular athlete at 5’10″ has a BMI of 28.7 (“overweight”) but may carry only 12% body fat — solidly in the athletic range. Conversely, a 150 lb sedentary person at the same height has a BMI of 21.5 (“healthy”) but may carry 28% body fat, which is borderline obese for men. BMI cannot distinguish between these two dramatically different body compositions.

Body fat percentage resolves this ambiguity by measuring actual fat tissue. DEXA scans provide the gold standard at ±1–2% accuracy for $50–$150 per session, also revealing bone density and regional fat distribution. Bioelectrical impedance scales ($20–$200) estimate body fat from electrical resistance but vary ±5–8% depending on hydration status.

For most people, tracking body fat % over time matters more than any single reading. A 2% monthly decrease while strength training indicates real fat loss even if the scale barely moves — you are likely replacing fat with denser muscle tissue. Combine with the BMR calculator to see how changing body composition affects resting metabolism.

  • DEXA scan: ±1–2% accuracy, $50–$150, also measures bone density
  • US Navy method: ±3–4% accuracy, free, requires measuring tape
  • Bioelectrical impedance: ±5–8%, varies with hydration and time of day
  • Skinfold calipers: ±3–5%, requires trained technician for consistency
  • Hydrostatic weighing: ±2–3%, gold standard before DEXA, less accessible
4

How to Reduce Body Fat Percentage

A 500-calorie daily deficit produces roughly 1 lb of fat loss per week, translating to about 1–2% body fat reduction per month for most adults. Protein intake at 0.7–1.0 g per pound of bodyweight preserves muscle mass during the deficit — without adequate protein, up to 25% of weight lost comes from muscle rather than fat.

Strength training 3–4 days per week is non-negotiable during fat loss. Muscle tissue burns 6–7 calories per pound per day at rest versus 2 calories for fat, so preserving (or building) muscle keeps your metabolic rate elevated throughout the cut. Sleep 7–9 hours nightly — sleep deprivation increases cortisol, which promotes visceral fat storage.

  1. 1

    Calculate your TDEE

    Use the calorie calculator to find maintenance calories based on your activity level.

  2. 2

    Set a moderate deficit

    Subtract 500 cal/day for ~1 lb/week loss. Never drop below 1,200 (women) or 1,500 (men) calories.

  3. 3

    Prioritize protein

    Aim for 0.7–1.0 g protein per lb bodyweight to prevent muscle loss during the deficit.

  4. 4

    Strength train consistently

    Lift weights 3–4 days/week. Muscle preservation maintains metabolic rate and improves body composition.

  5. 5

    Measure monthly

    Retake Navy method measurements every 4 weeks. Expect 1–2% body fat reduction per month with consistent effort.

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Waist-to-Height Ratio Calculator

Measure your waist-to-height ratio to assess central obesity and cardiovascular risk. Enter waist and height for an instant WHtR score with health category.

Body Roundness Index (BRI) Calculator

Calculate your Body Roundness Index from height and waist circumference. BRI assesses body shape and visceral fat risk more accurately than BMI alone.

Macro Split Calculator

Choose a protein, carb, and fat ratio then convert percentages to daily grams. Compare popular splits like 30/40/30 or 40/35/25 for your calorie target.

Related Resources

Ideal Weight Guide: How to Find Your Healthy Target Weight

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What BMI Actually Measures (and What It Misses): The Science Behind the Number

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Protein Calculator: How Much Protein Do You Need Per Day?

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BMI Calculator

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TDEE Calculator

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Last Updated: Mar 26, 2026

This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.

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