Body Fat Percentage Calculator

The tape method needs neck and waist (and hip for women). The skinfold methods need caliper readings in millimetres.
Metric uses kilograms and centimetres; US uses pounds with feet and inches; UK uses stones and pounds.
Every equation here was fitted separately for men and for women.
Used by the Deurenberg and Jackson-Pollock equations, and by the Army age bands.
Body weight: kilograms (metric), pounds (US) or whole stones (UK).
Only used with UK stones-and-pounds: the pounds part, e.g. 11 st 4 lb is weight 11 and extra pounds 4.
Used when the unit system is metric.
Used when the unit system is US or UK.
The inches part of a feet-and-inches height.
Tape method only. Centimetres in metric, inches in US/UK units. Measure below the larynx.
Tape method only. Men measure the abdomen at the navel; women measure the natural waist.
Tape method, women only: the widest point of the hips and buttocks.
Skinfold methods only. Siri is the usual choice; Brozek reads a little lower at high body fat.
Body fat
15.49 %
Body Fat Percentage Calculator
Category
Fitness
Fat mass
12.65 kg
Fat mass
27.9 lb
Lean (fat-free) mass
69.00 kg
Lean (fat-free) mass
152.1 lb
BMI
25.83 kg/m^2
Method used
Tape measure (US Navy / DoD circumference)
Standard error of this method
about 3.5 percentage points against hydrostatic weighing (Hodgdon & Beckett).
Waist-to-height ratio
0.486
Meets the 2026 Army waist-to-height standard
yes
Worked out from Hodgdon J.A. & Beckett M.B., Prediction of percent body fat for U.S. Navy men and women from body circumferences and height, Naval Health Research Center Reports 84-11 and 84-29 and 6 other sources.
Standard error of this method: about 3.5 percentage points against hydrostatic weighing (Hodgdon & Beckett).
Every method here is a regression fitted to a reference population, not a measurement of your body. Each carries a standard error of roughly 3-4 percentage points, and none is a diagnosis. Use a clinician, DXA or hydrostatic weighing if the number matters medically.

How this is worked out

5 steps
  1. Weight = 180.0 lb = 81.647 kg
  2. Height = 177.8 cm = 70 in
  3. Girth = abdomen - neck = 34 - 16 = 18 in
  4. %fat = 86.010 log10(18) - 70.041 log10(70) + 36.76 = 15.493%
  5. ACE category for men: Fitness.

Results are general information, not financial, tax, legal, medical or engineering advice.