Free Tool

Covert Bailey Body Fat Calculator

Estimate your body fat percentage using the Covert Bailey girth measurement method. All you need is a tape measure.

Measure at the navel

in

Measure at the widest point

in

Measure at the widest point with arm extended

in

Measure at the narrowest point, just above the wrist bone

in

What is the Covert Bailey method?

The Covert Bailey method is a body fat estimation technique from the book "Fit or Fat?" by Covert Bailey. It uses four circumference measurements (waist, hip, forearm, and wrist) to estimate body fat percentage without needing height, calipers, or any special equipment. The formula uses different coefficients for men and women.

While less commonly used in clinical settings than the Navy method or skinfold testing, the Bailey method provides a quick estimate that can be useful for tracking changes over time. Its main advantage is simplicity: four measurements with a tape measure and you have a result.

What measurements do I need?

  • Waist: Measure at the navel while standing relaxed
  • Hip: Measure at the widest point of the hips and buttocks
  • Forearm: Measure at the widest point with arm extended
  • Wrist: Measure at the narrowest point, just above the wrist bone

Bailey method formulas

Men: % Body Fat = waist + (0.5 x hip) - (3 x forearm) - wrist

Women: % Body Fat = waist + (0.5 x hip) - (2 x forearm) - wrist

All measurements are in inches. Metric values are automatically converted before calculation.

Try other methods

This calculator also supports the U.S. Navy method (tape measure), Jackson-Pollock 3-site skinfold (calipers), and manual entry for known values from DEXA scans or scales.

Frequently asked questions

What is the Bailey body fat method?

The Bailey method is a body fat estimation technique from Covert Bailey's book "Fit or Fat?". It calculates body fat percentage from four circumference measurements — waist, hip, forearm, and wrist — using a simple arithmetic formula with different coefficients for men and women. No height, weight, or calipers are required, making it one of the most accessible circumference-based approaches.

How accurate is the Bailey method compared to DEXA?

The Bailey method is less validated in peer-reviewed literature than the U.S. Navy or Jackson-Pollock methods. It can provide a reasonable directional estimate for general fitness tracking, but error margins are wider than those reported for the Navy method or skinfold testing. For individuals whose body proportions differ substantially from the populations in which the formula was developed, results may be less reliable.

What measurements do I need for the Bailey method?

You need four circumference measurements taken with a flexible tape measure: waist (at the navel, standing relaxed), hip (at the widest point of the hips and buttocks), forearm (at the widest point with arm extended), and wrist (at the narrowest point just above the wrist bone). All four measurements can be taken in under two minutes.

How do circumference-only methods like Bailey compare to the Navy method?

Both the Bailey and Navy methods use only a tape measure and no calipers, but they measure different sites. The Navy method uses neck, waist, hip (women only), and height — a combination that has been extensively validated against DEXA in large military populations. The Bailey method uses waist, hip, forearm, and wrist without requiring height. The Navy method generally has stronger published validation data, while the Bailey method is valued for its simplicity.

Why might Bailey give a different result than my smart scale?

Smart scales estimate body fat using bioelectrical impedance analysis (BIA), which measures how quickly an electrical signal travels through your body. The Bailey method uses external circumference measurements and a formula based on body proportions. The two approaches rely on different physiological assumptions and are calibrated against different reference populations, so discrepancies of several percentage points between methods are normal and expected.

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