Work out athlete calorie needs instantly with clear inputs, formula shown and shareable results.
Scales energy needs to fat-free mass, the approach used in sports nutrition to avoid low energy availability.
Athlete energy needs
Daily energy = fat-free mass (kg) x kcal per kg FFM, typically 40 to 60 depending on training load
Educational estimate only. Not a substitute for professional clinical judgement, and must not be used to make treatment or dosing decisions.
Energy availability below about 30 kcal per kg of fat-free mass a day, which disrupts hormones, bone and performance.
Fat tissue contributes little to energy expenditure, so lean mass is the better scaling variable in lean athletes.