Fitness Goal 4U

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Assess your push-up performance based on completed repetitions and test duration. Get a clear, easy-to-understand result using a transparent calculation method.

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Push-Up Test Performance

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Completed Repetitions30 reps
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Additional Seconds30 sec
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Updated 12 Aug 2026Free Push-Up Test Calculator

Body & Composition calculator

FFMI Calculator

Calculate Fat-Free Mass Index from height, weight and body-fat percentage using kilograms and metres internally.

Method reviewedUpdated 12 Aug 2026

Calculate with FFMI Calculator

Inputs are checked before calculation

Your result will appear here

Complete the fields and calculate. Your inputs stay on this device.

Purpose and context

What does the FFMI Calculator do?

FFMI adjusts estimated fat-free mass for height. It can help compare non-fat mass relative to stature, but depends on the quality of the body-fat estimate.

Who it supports: Adults with a representative body-fat percentage.

Transparent calculation

Formula and calculation method

FFMI = fat-free mass (kg) ÷ height² (m)

Fat-free mass is derived from weight and body-fat percentage, then divided by squared height. The result is displayed to one decimal place.

Primary keywordFFMI calculator
Result typeCalculator-specific result
Published
Last reviewed

Worked calculation example

At 75 kg, 20% body fat and 1.75 m, fat-free mass is 60 kg and FFMI is 60 ÷ 3.0625 = 19.6 kg/m².

The live calculator retains greater internal precision and rounds only when presenting the result.

How to use the FFMI Calculator

  1. Measure height and weight.
  2. Enter body-fat percentage from a consistent method.
  3. Calculate FFMI and review the fat-free mass used.

Understanding your result

The result card identifies the value, unit, method, supporting values and an accuracy notice. Estimated and predicted outputs are labelled so that apparent precision is not mistaken for certainty.

Continue with the Lean Body Mass Calculator for a related measurement using its own documented method.

Accuracy, assumptions and limitations

No unsourced athlete, natural or bodybuilding category is assigned. Measurement error in body fat can materially change FFMI.

Common input and interpretation mistakes

  • Using pounds and inches directly in the metric formula.
  • Comparing FFMI values derived from different body-fat methods.
  • Applying invented category cutoffs.

Primary method source: https://pubmed.ncbi.nlm.nih.gov/2248110/.

Fitness Goal 4U provides general informational calculations and does not replace medical assessment, diagnosis, treatment or individualized advice from an appropriately qualified professional.

Frequently asked questions about FFMI Calculator

It divides fat-free mass by height squared to express non-fat mass relative to stature.

Not specifically. Fat-free mass includes muscle, bone, water and organs.

The tool avoids applying unsourced or population-inappropriate labels to a derived estimate.

Yes, because hydration can influence body weight and many body-fat estimation methods.

Related calculators

These tools are connected by calculation purpose, inputs or the next question users commonly ask.

Lean Body Mass CalculatorCalculate lean body mass and estimated fat mass from body weight and an entered body-fat percentage. Body Fat CalculatorEstimate body-fat percentage from standardized circumference measurements with the selected U.S. Navy equation category. BMI CalculatorCalculate adult Body Mass Index from height and weight, then review the CDC screening category and healthy-range context. Strength Level CalculatorCalculate lift-to-bodyweight relative strength without applying invented or undocumented performance categories.