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Health & Fitness

Body Fat Estimator

Estimate body fat percentage from body measurements.

Formula reviewed: 2026-02-14 Health & Fitness

Use this free online Body Fat Estimator to approximates body fat percentage from body measurements and demographic inputs. It is useful when you need a focused browser-based utility that turns a specific set of inputs into a practical result quickly. The form focuses on Sex, Waist (cm), Neck (cm), Hip (cm, female only), Height (cm) and returns Body Fat Inputs, Estimate, so you can move from input to answer without setting up a spreadsheet or custom script. Run one realistic example, adjust the inputs, and compare how the result changes before you copy or share it. Save the inputs with the result when the output will be shared, audited, or used as part of a larger workflow.

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Input Pattern

Enter values in the left panel, keep units explicit, run the calculation, then copy or share the result. Invalid fields are highlighted immediately.

How to use this tool

  1. Enter Sex, Waist (cm), Neck (cm), Hip (cm, female only), Height (cm) for the body fat estimator, keeping units, dates, or text format consistent with the form labels.
  2. Check optional fields and assumptions before running so the result matches the workflow you have in mind.
  3. Click "Run the tool" and review Body Fat Inputs, Estimate for the primary output.
  4. Copy or share the result together with the inputs so the output can be reproduced later.

Body Fat Inputs

Estimate

Body fat %: 17.71

Category: Fit

How to interpret the result

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