# How does MealSnap calculate my calorie goal? > Your goal comes from your age, height, weight and activity level, adjusted for the pace you picked. ## The formula MealSnap uses the Mifflin-St Jeor formula to estimate your resting burn, multiplies it by an activity factor, and then adjusts for your goal. Losing about 0.5 kg a week means roughly 550 kcal below maintenance. ## Safety first Goals never drop below a safe floor, and a target weight that would be unhealthily low triggers a caution with a safer alternative. ## Macros too The plan also sets a protein target of about 1.8 g per kg of body weight, with the rest split between carbs and fat.