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FFMILab
Adjusted FFMI: how much of your mass is muscle relative to height.
FFMI adjusts fat-free mass for height the same way BMI adjusts weight, giving a fairer comparison of muscularity across different heights than raw muscle mass alone.
An FFMI around 25 is considered a realistic upper limit for most natural (non-enhanced) male lifters — values noticeably above that are one of the signals researchers use when studying anabolic steroid use in bodybuilding.
Daily energy expenditure with personalised macro splits.
OpenBody mass index with healthy-range guidance.
OpenUS Navy circumference method for body fat percentage.
OpenDaily hydration target based on weight, activity, and climate.
OpenFFMI (adjusted)
21.584
Natural genetic ceiling ≈ 25. Above 26 is unusual without PEDs.
What you entered
Lean mass = weight × (1 − body fat %)
80 × (1 − 15/100)= 68.0 kgDivide by height² (metres)
68.0 ÷ 1.78²= 21.46Height-normalize (adjusted FFMI)
+ 6.1 × (1.8 − 1.78)= 21.58Result
FFMI (adjusted): 21.584
At 80 kg, 178 cm, and 15% body fat, your adjusted FFMI is 21.58.