MasterTool

Body Fat Percentage Calculator

Estimate body fat percentage from your measurements.

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What this tool does

Estimate body fat percentage from your measurements. Tape-based US Navy approximation with inches; technique and body type can cause substantial error.

How to use the Body Fat Percentage Calculator

  1. Enter or select us navy equation.
  2. Enter or select height in in.
  3. Enter or select waist circumference in in.
  4. Enter or select neck circumference in in.
  5. Enter or select hip circumference (female equation) in in.
  6. Read the calculated result; change any measurement to compare alternatives.

Formula

male BF%=86.010 log10(waist−neck)−70.041 log10(height)+36.76; female=163.205 log10(waist+hip−neck)−97.684 log10(height)−78.387 (inches)
sex
US Navy equation
height
Height (in, before metric conversion)
waist
Waist circumference (in, before metric conversion)
neck
Neck circumference (in, before metric conversion)
hip
Hip circumference (female equation) (in, before metric conversion)

Tape-based US Navy approximation with inches; technique and body type can cause substantial error.

Worked example

For body fat percentage calculator, the following measurements illustrate the exact method: US Navy equation: male; Height: 67; Waist circumference: 34; Neck circumference: 15; Hip circumference (female equation): 38.

Inputs

  • US Navy equationMale
  • Height67 in
  • Waist circumference34 in
  • Neck circumference15 in
  • Hip circumference (female equation)38 in

Result

  • Estimated body fat (%)18.85

Results explained

Estimated body fat (%)
Estimated body fat (%) from the formula above. Tape-based US Navy approximation with inches; technique and body type can cause substantial error.

Frequently asked questions

male BF%=86.010 log10(waist−neck)−70.041 log10(height)+36.76; female=163.205 log10(waist+hip−neck)−97.684 log10(height)−78.387 (inches)

Tape-based US Navy approximation with inches; technique and body type can cause substantial error.

No. These are general-information estimates, not diagnosis, treatment, fertility advice or exercise clearance. Consult a qualified health professional.

Individual physiology, measurement technique and health conditions may cause large differences from model estimates.

No. BAC estimates never establish that driving is safe or legal; do not drive after drinking.