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Body Fat Percentage Calculator Online - No Signup

Use the U.S. Navy circumference method with metric or imperial units. Review your body fat category, fat mass, lean body mass, and important interpretation guidance.

Calculate Body Fat See how it works
U.S. Navy method Male and female Fat and lean mass No data uploads

Body Fat Calculator

Enter your gender, height, weight, and circumference measurements. Values are calculated locally and are not submitted or stored.

Intended for adults aged 18+

Your measurements

Select a sex, choose a unit system, and enter your height, weight, and circumference measurements.

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cm

cm

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Private browser calculation. Your measurements are not uploaded, stored, or added to the URL.

Fitness

This estimate falls within the commonly used adult fitness body fat range for males.

Category Fitness
Fat mass 14.4 kg
Lean mass 63.6 kg
BMI estimate 25.5
Sex used Male
Method U.S. Navy

Adult body fat category scale

Visual scale shown for adult males
Essential
Athletes
Fitness
Average
Obese
Body fat percentage is an estimate, not a diagnosis. It does not directly measure fitness, internal health, fat distribution, or organ composition.
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Private calculation Measurements remain in your browser
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U.S. Navy method Widely used circumference formula
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Male and female Sex-specific formulas and categories
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Context included Important limitations remain visible
Body fat explained

A practical estimate based on body circumference

Body fat percentage describes the share of your total body weight that is fat tissue. Unlike scale weight alone, it separates fat from lean mass such as muscle, bone, organs, and water.

This calculator uses the U.S. Navy circumference method, a popular screening formula that requires only a tape measure and a scale. It is convenient and free, but it remains an estimate rather than a clinical measurement.

Why body fat is one signal among many

Two people with identical body fat percentages can have very different fitness, metabolism, and risk profiles. Body fat distribution, muscle mass, activity, sleep, and nutrition all matter.

Adult and pediatric body fat differ

The categories used here apply to adults aged 18 and older. Children and teenagers require age- and sex-specific assessments interpreted with pediatric growth references.

Clear and useful results

Everything needed for an adult body fat estimate

Switch units, understand the calculation, and review the result without unnecessary personal information.

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Metric measurements

Enter height, weight, and circumferences in centimeters and kilograms.

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Imperial measurements

Use feet, inches, and pounds with exact conversion internally.

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Sex-specific formulas

Male and female formulas with hip circumference used for females.

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Fat and lean mass

See your estimated fat mass and lean body mass alongside your percentage.

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Category visualization

See the result positioned across the standard adult body fat categories.

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Responsible guidance

Keep important limitations and appropriate-use information visible.

Three simple steps

How to calculate body fat percentage

Get a clear screening estimate with only a tape measure and a scale.

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Step 1

Choose sex and units

Pick male or female and select metric or imperial units. The formula adjusts automatically.

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Step 2

Measure and enter values

Use a tape measure around your neck, waist, and hip (for females), plus height and weight.

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Step 3

Interpret with context

Review the category and the fat-mass split while remembering that body fat is only one screening measure.

Adult category reference

Commonly used adult body fat categories

These ranges are general adult screening references and do not represent an individual diagnosis.

Adult category Male Female General screening interpretation
Essential fat 2–5% 10–13% Minimum fat needed for basic physical and reproductive health
Athletes 6–13% 14–20% Typical of trained competitors in many sports
Fitness 14–17% 21–24% Lean, active adult range
Average 18–24% 25–31% Common adult range that may carry increased risk at the upper end
Obese 25%+ 32%+ Higher body fat screening category
Body fat estimates have important limitations. The Navy method can be affected by measurement technique, hydration, posture, body shape, and recent meals. Highly muscular individuals, older adults, and people with specific medical conditions may need professional assessment.
Better interpretation

Use body fat as one piece of a larger picture

Health cannot be summarized by a single circumference formula.

1

Measure consistently

Use the same tape, time of day, posture, and body position each time you measure.

2

Consider body composition

Muscle mass, fat distribution, bone structure, age, and sex all affect how body fat should be interpreted.

3

Look at trends

A single number offers less context than a trend reviewed alongside other health and fitness measures.

4

Discuss concerns professionally

A qualified healthcare professional can interpret body composition alongside medical history and lab results.

Common questions

Body Fat Calculator FAQ

What is body fat percentage?

Body fat percentage is the proportion of your total body weight that is fat tissue, compared with lean mass such as muscle, bone, organs, and water.

Which method does this calculator use?

This calculator uses the U.S. Navy circumference method. For men it uses height, neck, and waist. For women it uses height, neck, waist, and hip measurements.

How accurate is the Navy body fat method?

The Navy method is a convenient circumference-based estimate. It can be reasonably close for many adults but may differ from clinical methods such as DEXA, underwater weighing, or air displacement.

Can this calculator be used for children or teenagers?

No. The categories and formulas here are intended for adults aged 18 and older. Children and teenagers require age- and sex-specific body fat assessment interpreted by a qualified professional.

How should I measure my waist, neck, and hip?

Measure while standing relaxed. Keep the tape horizontal and snug without compressing the skin. Neck at the narrowest point, waist at the navel, and hip at the widest point.

Why does my result differ from a smart scale?

Smart scales often use bioelectrical impedance, which is sensitive to hydration, food, skin temperature, and recent activity. Different methods naturally produce different estimates.

Is this body fat result medical advice?

No. The result is an educational estimate and not a diagnosis or personalized medical recommendation. A healthcare professional can interpret body composition alongside medical history and other health measures.

Continue calculating

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Estimate your body fat in seconds

Enter your measurements, switch between metric and imperial units, and review the result with the context it needs.

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