Free Fitness Calculators

Science-backed tools for training and nutrition. All free, no signup required.

Cut Calculator

Calories, macros & fat-loss timeline

TDEE, protein, carbs & fat

Navy method body fat %

One rep max & strength percentages

Body mass index & interpretation

Daily protein target by goal

Fat-free mass index & natty limit

Surplus calories & muscle gain rate

How long to reach your goal weight

Calories to gain muscle

Training zones by max heart rate

Daily hydration target