1
A base multiplier is set by activity level — 0.6 g/lb (sedentary) up to 0.9 g/lb (very active). This covers maintenance needs under typical daily activity.
2
Your goal adjusts the multiplier upward. Fat Loss adds 0.15 g/lb to preserve muscle in a deficit. Muscle Gain adds 0.2 g/lb to support growth. Athletic Performance adds 0.3 g/lb with a minimum floor of 1.0 g/lb.
3
The final multiplier is applied to your bodyweight to get your daily gram target. Protein provides 4 kcal per gram, so the calorie contribution is target × 4.