FFMI Examples by Body Type: Tall, Short, and Average Heights

July 14, 2026

Why Height Changes the Comparison

Two lifters can have identical raw FFMI numbers and still not be equally muscular relative to their frame, because raw FFMI is naturally biased by height — taller lifters tend to show a higher raw FFMI, and shorter lifters a lower one, for a similar underlying level of muscularity. That’s exactly what normalization corrects for. These worked examples, calculated with the same formulas behind the FFMI calculator, show the correction in action.

Example 1 — Taller Lifter (6’4” / 1.93 m, 95 kg, 10% body fat)

FFM = 95 × (1 − 0.10) = 85.5 kg
Raw FFMI = 85.5 ÷ 1.93² = 23.0
Normalized FFMI = 23.0 + 6.3 × (1.80 − 1.93) = 23.0 − 0.8 = 22.1

Because this lifter is taller than the 1.8 m reference height, normalization pulls the score down slightly — from 23.0 raw to 22.1 normalized — correcting for the natural height-related boost in raw FFMI.

Example 2 — Shorter Lifter (5’6” / 1.68 m, 75 kg, 10% body fat)

FFM = 75 × (1 − 0.10) = 67.5 kg
Raw FFMI = 67.5 ÷ 1.68² = 23.9
Normalized FFMI = 23.9 + 6.3 × (1.80 − 1.68) = 23.9 + 0.8 = 24.7

Because this lifter is shorter than the reference height, normalization pushes the score up — from 23.9 raw to 24.7 normalized. Compared to Example 1, the shorter lifter’s normalized result (24.7) is now notably closer to the natural reference point of 25 than the taller lifter’s (22.1), even though both started with fairly similar raw FFMI numbers.

Example 3 — At the Reference Height (5’11” / 1.80 m, 90.7 kg, 12% body fat)

FFM = 90.7 × (1 − 0.12) = 79.8 kg
Raw FFMI = 79.8 ÷ 1.80² = 24.6
Normalized FFMI = 24.6 + 6.3 × (1.80 − 1.80) = 24.6

At exactly the 1.8 m reference height, raw and normalized FFMI are always identical — there’s nothing to correct for.

Example 4 — Average Woman (5’5” / 1.65 m, 60 kg, 22% body fat)

FFM = 60 × (1 − 0.22) = 46.8 kg
Raw FFMI = 46.8 ÷ 1.65² = 17.2
Normalized FFMI = 17.2 + 6.3 × (1.80 − 1.65) = 17.2 + 0.9 = 18.1

This falls within the average-to-trained female reference range (roughly 15–19). Remember the ~25 natural limit reference point is specific to men — the original study only examined male athletes, so it isn’t a meaningful benchmark for this result. See the FFMI glossary for why.

Example 5 — Near the Natural Limit (5’10” / 1.78 m, 100 kg, 8% body fat)

FFM = 100 × (1 − 0.08) = 92.0 kg
Raw FFMI = 92.0 ÷ 1.78² = 29.0
Normalized FFMI = 29.0 + 6.3 × (1.80 − 1.78) = 29.0 + 0.1 = 29.2

A normalized FFMI of 29.2 sits well above the ~25 reference point established by Kouri et al.’s study of natural athletes. At this level, either the body fat percentage was measured with unusual precision and the individual represents an outlier case, or — more commonly — the body fat percentage input understated actual body fat, inflating the FFM (and therefore FFMI) calculation. See common FFMI mistakes for how measurement error produces results like this.

The Pattern Across These Examples

Height normalization typically shifts results by less than a full point unless someone is considerably taller or shorter than 1.8 m — but that shift is exactly what makes comparing two lifters of different heights fair. Run your own height, weight, and body fat percentage through the FFMI calculator to see both your raw and normalized results calculated automatically.