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Fitness & Health

Body Fat Calculator

Estimate body fat percentage with the U.S. Navy tape-measure method.

Calculator.net reference
Inputs
Defaults are prefilled so the result is visible immediately.
in
in
in
in
lb
Results
Results update as the calculator inputs change.

Estimated body fat

17.5%

This is an estimate only and is not a medical body-composition assessment.

Fat mass

29.8 lb

Lean mass

140.2 lb

Method

U.S. Navy tape

Formula and Assumptions
U.S. Navy method uses logarithms of waist, neck, hip, and height measurements.

Tape-based methods are sensitive to measurement technique.

Use the same measurement sites and conditions if you are tracking change over time.

Reference Upgrade
Built from the Calculator.net model, with added context.

Live validation and instant result updates instead of a submit-only workflow.

Multiple decision metrics are shown together, not only the primary answer.

Formula notes and assumptions are visible on the page so the math is easier to audit.

Reference Model

Modeled after the input style and primary output on Calculator.net's Body Fat Calculator.

The page keeps the math in one place and exposes the assumptions beside the result.

Default inputs: sex=male, height=70, neck=15, waist=34, hip=40, weight=170