When you set up your profile, Hitt Fitness produces a daily calorie target almost instantly. Behind that number is a well-validated estimate of how much energy your body uses at rest.
We use the Mifflin-St Jeor equation, which estimates resting metabolic rate (RMR) from your sex, age, height, and weight. Among the common prediction formulas, it's one of the most accurate for the general population — which is why it's our default and labeled ✓ Peer-reviewed
RMR is only part of the story. We multiply it by an activity factor based on the level you choose — from sedentary to very active — to estimate your total daily energy expenditure (TDEE).
Activity multipliers are necessarily rough, and metabolism adapts as you lose or gain weight. That's why we treat the target as a hypothesis to test, not a number to obey. If the scale and your energy aren't tracking the way you expect after a couple of weeks, adjust — and the app makes that easy.
Good math gets you to a smart starting point fast. Honest tracking over a few weeks gets you to the number that's actually right for you.