Estimate realistic muscle gain rate and remaining natural potential.
Gain rate falls sharply with training experience, roughly halving each year for the first few years. Proximity to the estimated ceiling compresses it further, which is why advanced trainees gain very slowly. FFMI ceilings are population estimates with genuine outliers, so they indicate typical limits rather than hard biological ones.
Muscle Gain Potential
Gain rate declines with training age and with proximity to the estimated lean mass ceiling
These figures are population-average estimates for training and recreational planning only and are not medical advice. Individual responses vary widely. Consult a qualified health professional before starting or significantly changing an exercise, supplement or nutrition programme, particularly if you have any medical condition.
Gain rate declines with training age and with proximity to the estimated lean mass ceiling Gain rate falls sharply with training experience, roughly halving each year for the first few years. Proximity to the estimated ceiling compresses it further, which is why advanced trainees gain very slowly.
FFMI ceilings are population estimates with genuine outliers, so they indicate typical limits rather than hard biological ones.
This calculator takes 5 inputs: Height, Current weight, Body fat, Training experience, Sex. The pre-filled defaults are a realistic starting point — replace them with figures from your own environment for a result you can act on.