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Health & Fitnessbody composition

Body Fat Percentage Calculator

Body fat estimated from tape measurements or BMI. Both methods carry three to five percentage points of error against a proper measurement, so the band matters more than the point estimate.

Also called: body fat percentage calculator, navy body fat.

Method
cm
kg
cm
cm
cm
Sex
Estimated body fat
22.58%

22.58% by the US Navy tape method, which puts you in the average range. The error on this method is about 3.5 percentage points, so the real figure is likely between 19.08% and 26.08%. Fat mass is 17.61 kg and lean mass 60.39 kg. Fitted against hydrostatic weighing on a military population, so it fits body types far from that sample less well.

Fat mass
17.61
Lean mass
60.39
Error margin
3.5
Lower estimate
19.08%
Upper estimate
26.08%
Category
average
Method
US Navy tape method
On the method
Fitted against hydrostatic weighing on a military population, so it fits body types far from that sample less well.

For reference only. Verify against your clinical protocol before acting on this number.

Method and background

This is what the calculation gives for the numbers you entered. It is an estimate, not advice, and it knows nothing about your situation beyond those numbers. Rules for India change on a published schedule; the effective date is shown on every rule-based tool.

How this is calculated

The Navy method uses circumferences and was fitted against hydrostatic weighing on military personnel, which is why it works less well for body types far from that sample. The Deurenberg equation estimates from BMI, age and sex and carries larger error still. Neither is a measurement: both are regressions with three to five percentage points of standard error, which is wider than the gap between fitness categories. Tracking the trend with a consistent method beats comparing a single reading to a table.

the Navy tape method, fitted to hydrostatic weighing on a military population
w
Waist
n
Neck
h
Height

Worked examples

Each of these is asserted on every build. If a change to the engine ever moved one of these answers, the build would fail before the page could print it.

the Navy method on a 172 cm adult

Method
US Navy tape method
Height
172 cm
Weight
78 kg
Neck circumference
38 cm
Waist circumference
92 cm
Hip circumference, women only
98 cm
Age
38
Sex
Male

Estimated body fat22.58%

The Navy regression on a 54 cm waist to neck difference

Open this example

the BMI method carries larger error

Method
BMI based, Deurenberg
Height
172 cm
Weight
78 kg
Neck circumference
38 cm
Waist circumference
92 cm
Hip circumference, women only
98 cm
Age
38
Sex
Male

Estimated body fat24.18%

boundary: the wider band on an inferred estimate

Open this example

Method and limits

What it assumes

  • Measurements taken at standard anatomical sites with a non-stretch tape.

What it deliberately does not model

  • Error against DEXA or hydrostatic weighing is three to five percentage points either way.
  • The Navy formula was fitted to a military population and fits athletes and the very lean poorly.
  • Measurement technique varies enough between people to matter, so track your own trend.

Formula version 1.0.0 · definition 1.0.0 · India · Report a problem with this calculator

Frequently asked questions

How accurate is this?
Within three to five percentage points of a proper measurement, which is wider than the gap between categories. Use it to track a trend, not to place yourself in a band.
Which method is better?
The tape method, since it uses actual measurements rather than inferring from BMI. Both carry substantial error.