DataFood
Educational only, and not medical advice. The figures on this site are estimates from population equations, not measurements of any individual. If you are pregnant, under 18, managing a medical condition, or have any history of disordered eating, speak to a clinician rather than a calculator.

Eating for mass, and the rate that decides the surplus

How large a surplus should be, how fast muscle can actually be built, and why a surplus bigger than that rate can support adds fat and nothing else.