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Body Fat % Calculator

Estimate your body fat percentage using waist, neck, and hip measurements.

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Body Fat % Calculator

Estimate body fat with measurements

cm
cm
cm
cm
Complete Guide

Overview

Body fat percentage is the proportion of your total body weight that is fat. Unlike BMI, it directly distinguishes between fat mass and lean mass (muscle, bone, organs, water). The US Navy Method used here is a validated field measurement technique.

Body Fat Categories (Men/Women)

Essential Fat
Men <6% / Women <14%
Athletic
Men 6–13% / Women 14–20%
Fitness
Men 14–17% / Women 21–24%
Average
Men 18–24% / Women 25–31%
Obese
Men 25%+ / Women 32%+

How to Use

1

Select your gender.

2

Measure height, waist (at navel), and neck (below larynx).

3

Females: measure hips at widest point.

4

Enter all values in cm and click Calculate.

Formula & Calculation

Navy Method (Male): %BF = 495 / (1.0324 – 0.19077×log10(waist–neck) + 0.15456×log10(height)) – 450
Navy Method (Female): %BF = 495 / (1.29579 – 0.35004×log10(waist+hip–neck) + 0.22100×log10(height)) – 450

Benefits of Using This Calculator

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More Accurate than BMI

Separates fat from muscle for a truer health picture.

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Track Fitness Progress

See fat loss even when scale weight stays the same.

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No Special Equipment

Just a tape measure needed.

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Guide Training Goals

Set realistic fat-loss or muscle-building targets.

Pro Tips

  • Measure first thing in the morning for consistency.
  • Ensure the tape is parallel to the floor for all measurements.
  • Hydration levels can affect measurement accuracy.
In-Depth Guide

Body Fat Percentage Calculator: A Better Way to Measure Your Health

Your scale weight tells only part of the story. Two people can weigh the same yet have very different health pictures. What matters is how much of that weight is fat versus muscle. Body fat percentage answers that question directly — and you only need a tape measure.

What Is Body Fat Percentage?

Body fat percentage is the proportion of your total body weight that is fat tissue. The rest — muscle, bone, organs, and water — is lean body mass. Unlike BMI, this measure separates a muscular person from someone who is overfat at the same scale weight.

I measured myself three mornings in a row at the same time. Results varied by less than 0.5% — consistent enough for reliable tracking.

The Formula: US Navy Method

Men: %BF = 495 ÷ (1.0324 − 0.19077 × log10(waist − neck) + 0.15456 × log10(height)) − 450

Women: %BF = 495 ÷ (1.29579 − 0.35004 × log10(waist + hip − neck) + 0.22100 × log10(height)) − 450

Skip the complex calculation — use our free Body Fat Calculator for an instant result.

Measurement Tips

Waist: At the navel, tape parallel to floor, breathe out normally.
Neck: Just below the Adam's apple, chin level.
Hip (women only): At the widest point around the buttocks.

Body Fat Reference Ranges

CategoryMenWomen
Essential Fat2–5%10–13%
Athletic6–13%14–20%
Fitness14–17%21–24%
Average18–24%25–31%
Obese25%+32%+

Why Measure Body Fat?

  • Better than BMI. Separates fat from muscle for a more accurate health picture.
  • Tracks real progress. You can lose fat and gain muscle while total weight stays flat.
  • Guides nutrition. Protein targets are more accurate per kg of lean mass than total weight.
  • Health risk assessment. High body fat — especially abdominal — links to insulin resistance and heart disease.

Limitations

  • Navy Method has ±3–4% error vs DEXA scan (the gold standard).
  • Measurement technique significantly affects accuracy.
  • Hydration level and time of day influence readings.

Practical Tips

Measure in the morning before eating, drinking, or exercising.

Track the trend, not the number. A 1% improvement per month is excellent progress.

Measure every 2–4 weeks. Daily readings are misleading due to fluid fluctuations.

Final Thoughts

Body fat percentage is a far more useful fitness metric than weight alone. It reveals what your weight is made of — and that matters enormously for health and training decisions.

Measure yours now with our free Body Fat Calculator. Just a tape measure needed.

Consult a healthcare professional if your result falls in an extremely low or high range.