Health & Fitness

Body Fat Percentage Calculator

Full calculator

Health & Fitness

Body Fat Percentage Calculator

Body-fat estimate18.8%Male formula · U.S. Navy circumference method · Fitness screening band

This is a screening estimate, not a clinical body-composition measurement. Repeatable tape placement matters most.

178.0 cmHeight

40.0 cmNeck

90.0 cmWaist

Not usedHip

Formula

Units

Height (cm)Measure standing height. The Navy equation internally uses inches.Neck circumference (cm)Measure at a consistent tape position; small changes move the estimate.

Waist circumference (cm)This is the most sensitive input; keep tape level and repeatable.Hip circumferenceSwitch to the female formula when the hip measurement is part of the equation.

Live result18.8% body fatMale formula · Fitness screening band · tape-position sensitive.

Formula used

Male: 86.010 log10(waist − neck) − 70.041 log10(height) + 36.76. Female: 163.205 log10(waist + hip − neck) − 97.684 log10(height) − 78.387.

This is the method behind the answer, so the result can be checked rather than simply trusted.

Live math canvas

Your numbers, formula and explanation together

Body Fat Percentage Calculator: 18.8% body fat. U.S. Navy circumference estimate from height, neck and waist. Measurement consistency matters more than decimal precision.

Formula applied

The exact method behind this answer

CalculationTime keeps the method visible so the number can be checked instead of blindly trusted.

Male: 86.010 log10(waist − neck) − 70.041 log10(height) + 36.76. Female: 163.205 log10(waist + hip − neck) − 97.684 log10(height) − 78.387.

Apply the formulaMale: 86.010 log10(waist − neck) − 70.041 log10(height) + 36.76. Female: 163.205 log10(waist + hip − neck) − 97.684 log10(height) − 78.387.18.8% body fatU.S. Navy circumference estimate from height, neck and waist. Measurement consistency matters more than decimal precision.

Your live breakdown

Current inputs in the calculation

These values come from the controls above and update when the calculator changes.

Formula sex: Male formula
Height: 178 cm
Neck circumference: 40 cm
Waist circumference: 90 cm
Hip circumference: 100 cm

Resulting answer

18.8% body fat

U.S. Navy circumference estimate from height, neck and waist. Measurement consistency matters more than decimal precision.

Answer: 18.8% body fat
Live support: U.S. Navy circumference estimate from height, neck and waist. Measurement consistency matters more than decimal precision.

Assumptions used

What this answer assumes

The visible assumptions define the boundary of this calculation.

Measurements must be consistent and positive.
Circumference estimates are approximate and can differ from lab methods.
This is health education only, not diagnosis.

Master’s Tip

How to use the result well

Master’s Tip: measurement consistency matters more than decimal precision; use the same tape position each time.

Printable record

What belongs in the saved calculation

Save the inputs, result, formula, assumptions, page URL and date together so the calculation can be reviewed later.

Formula sex: Male formula
Height: 178 cm
Neck circumference: 40 cm
Waist circumference: 90 cm

Visual grid

This number is one point on a larger pattern

Body Fat Percentage is not just a final answer. It is a step on a line: before and after, input and output, assumption and result.

Micro-timehours, minutes, shiftsHuman scaledays, weeks, projectsMacro-timemonths, years, calendars

InputFormulaResult

18.8% body fat

CalculationTime keeps the path visible: the input, the method and the final number belong together.

18.8% body fatU.S. Navy circumference estimate from height, neck and waist. Measurement consistency matters more than decimal precision.

Inputs

Formula sex: Male formula
Height: 178 cm
Neck circumference: 40 cm
Waist circumference: 90 cm
Hip circumference: 100 cm

Method

Male: 86.010 log10(waist − neck) − 70.041 log10(height) + 36.76. Female: 163.205 log10(waist + hip − neck) − 97.684 log10(height) − 78.387.

For a male-formula adult at 178 cm height, 90 cm waist and 40 cm neck, the equation estimates about 21% body fat.

Assumptions

Measurements must be consistent and positive.
Circumference estimates are approximate and can differ from lab methods.
This is health education only, not diagnosis.

Notes

Use this space on the printed report for client, supplier, classroom, job-location, measurement, quote or approval notes.