Circumference-based body composition and BMI

Historical Hodgdon–Beckett (1984) body fat estimate from height and girths. Men: abdomen at the navel and neck; women: natural narrow waist, hips at their widest point and neck. BMI = weight / height².

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Calculation

Unit system
Sex
Measure neck just below the Adam's apple, tape horizontal
Historical Hodgdon–Beckett (1984) body fat estimate from height and girths. Men: abdomen at the navel and neck; women: natural narrow waist, hips at their widest point and neck. BMI = weight / height².

The result updates as you change the fields. Your data never leaves the browser.

This calculation is for reference only and is not medical advice, a diagnosis or a prescription. If you have a medical condition, are pregnant, take medication or have any doubts, discuss the result with a physician or a qualified nutrition professional.

Result

Body fat
16.9 %

Fitness range

Fat mass
12.7 kg
Lean mass
62.3 kg
Body mass index
24.5 kg/m²

Normal weight

Circumference estimates do not replace body composition measurements and are not the current official Navy standard. ACE body fat categories are descriptive references, not diagnoses; BMI is a separate adult classification. The model is not calculated for inapplicable girths.

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How it is calculated

Historical Hodgdon–Beckett (1984) body fat estimate from height and girths. Men: abdomen at the navel and neck; women: natural narrow waist, hips at their widest point and neck. BMI = weight / height².

Formula

Men: %fat = 495 / (1.0324 − 0.19077 × log₁₀(waist − neck) + 0.15456 × log₁₀(height)) − 450; Women: %fat = 495 / (1.29579 − 0.35004 × log₁₀(waist + hip − neck) + 0.221 × log₁₀(height)) − 450; BMI = weight / height²

Limits of the method

Circumference estimates do not replace body composition measurements and are not the current official Navy standard. ACE body fat categories are descriptive references, not diagnoses; BMI is a separate adult classification. The model is not calculated for inapplicable girths.

Sources of the method

How to use the calculation

1

Enter the starting values

Historical Hodgdon–Beckett (1984) body fat estimate from height and girths. Men: abdomen at the navel and neck; women: natural narrow waist, hips at their widest point and neck. BMI = weight / height².

2

Adjust the parameters

Historical Hodgdon–Beckett (1984) body fat estimate from height and girths. Men: abdomen at the navel and neck; women: natural narrow waist, hips at their widest point and neck. BMI = weight / height².

3

Read the result

Circumference estimates do not replace body composition measurements and are not the current official Navy standard. ACE body fat categories are descriptive references, not diagnoses; BMI is a separate adult classification. The model is not calculated for inapplicable girths.

Frequently asked questions

What does the calculation show?

Historical Hodgdon–Beckett (1984) body fat estimate from height and girths. Men: abdomen at the navel and neck; women: natural narrow waist, hips at their widest point and neck. BMI = weight / height².

What limitations apply?

Circumference estimates do not replace body composition measurements and are not the current official Navy standard. ACE body fat categories are descriptive references, not diagnoses; BMI is a separate adult classification. The model is not calculated for inapplicable girths.

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