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FFMI Calculator

Find your fat-free mass index (FFMI), a measure of how much lean mass you carry for your height. Enter your weight, height and body fat percentage to get your FFMI, the height-normalized FFMI, your lean and fat mass, and what it would take to reach the next level.

Units
Sex
kg
lb
cm
ft
in
%

From calipers, a smart scale, DEXA or the Body Fat Calculator.

Enter your values to see the result.
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How to use the FFMI Calculator

  1. Choose units: metric (kg, cm) or US (lb, feet and inches), and pick your sex for the reference ranges.
  2. Enter your body weight and height.
  3. Enter your body fat percentage. If you don't know it, estimate it first with the Body Fat Calculator.
  4. Press Calculate FFMI to see your normalized FFMI, raw FFMI, lean mass and category.
  5. Check the tables to see how your FFMI changes at other body fat levels and how much lean mass each FFMI level needs.

FFMI formula

  • Fat-free mass (kg) = weight (kg) × (1 − body fat % ÷ 100)
  • FFMI = fat-free mass (kg) ÷ height (m)²
  • Normalized FFMI = FFMI + 6.1 × (1.8 − height in m)

Example: a man who weighs 80 kg at 180 cm with 15% body fat has 80 × 0.85 = 68 kg of fat-free mass. His FFMI is 68 ÷ 1.80² = 20.99. Because he is exactly 1.80 m tall, the normalized FFMI is the same, 21.0, which is above average. In US units, convert pounds to kg by multiplying by 0.4536 and inches to meters by multiplying by 0.0254.

FFMI ranges (normalized)

MenWomenWhat it usually means
Below 18Below 15Below average lean mass
18 – 2015 – 17Average, typical for untrained adults
20 – 2217 – 18Above average, regular training
22 – 2318 – 19Excellent
23 – 2619 – 22Superior, years of dedicated training
26 – 2822 – 24Very high, rarely reached without drugs
Above 28Above 24Extremely high

These bands are a common rule of thumb, not medical categories. They come from the Kouri et al. (1995) study, where steroid-free male athletes topped out around a normalized FFMI of 25, and from typical values seen in the general population. Ranges for women are less well studied.

Tips for a reliable result

  • Measure body fat with the same method each time, ideally in the morning before eating.
  • Track the trend over months rather than reading too much into a single number.
  • Gaining lean mass raises FFMI. Losing fat alone barely changes it, but it lowers your body fat percentage.

Frequently asked questions

What is FFMI?

FFMI (fat-free mass index) is your fat-free mass in kilograms divided by your height in meters squared. It works like BMI but ignores body fat, so it reflects how much muscle, bone and other lean tissue you carry for your height.

How is normalized FFMI calculated?

Normalized FFMI = FFMI + 6.1 × (1.8 − height in meters). The adjustment comes from the 1995 study by Kouri and colleagues and makes people of different heights easier to compare, because taller people tend to have a slightly higher raw FFMI.

What is a good FFMI?

For men, a normalized FFMI of about 18 to 20 is typical of untrained adults, 20 to 22 shows above-average muscle, and 22 to 25 is common in people who train seriously. For women, typical values are lower, roughly 14 to 17, with 18 to 21 indicating a lot of muscle.

What is the natural FFMI limit?

In the Kouri study of male athletes, the highest normalized FFMI among men who did not use steroids was about 25, so 25 is often quoted as a practical natural ceiling for men. A few people exceed it naturally, and the figure was based on one group of men, so treat it as a guide rather than a rule.

How accurate is FFMI?

FFMI is only as accurate as your body fat estimate. A 3 to 4 percentage point error in body fat, common with bathroom scales and calipers, changes FFMI by roughly 1 point. DEXA or careful skinfold measurements give a more reliable result.

Is FFMI better than BMI?

For muscular people, yes. BMI counts muscle and fat the same, so a lean, muscular person can be labeled overweight. FFMI separates lean mass from fat, but it needs a body fat percentage, which BMI does not.

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