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.
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 examplethe 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 exampleMethod 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.