About FitCalcs

FitCalcs is a small collection of free fitness and nutrition calculators. The goal is simple: give you clear, accurate answers to everyday training and diet questions — how many calories you need, how much protein to eat, how to structure a reverse diet — without accounts, paywalls, or clutter.

How the numbers are calculated

Our calculators use well-established, published formulas. Calorie needs are based on the Mifflin-St Jeor equation combined with standard activity multipliers. Macro splits use widely recommended targets. These are estimates to guide you, not exact prescriptions — real results vary from person to person, and you should adjust based on how your body responds.

Not medical advice

FitCalcs is for general educational use by healthy adults. It is not a substitute for professional medical or dietary advice. If you have a medical condition, a history of disordered eating, or are pregnant, please consult a qualified professional before making changes to your diet or exercise.