Fitness Calculators
Free, personalized fitness calculators. Get evidence-based numbers for body composition, energy expenditure, protein, hydration, and creatine in seconds.
Body Composition
Nutrition
Calorie & Macro Calculator
Personalized calories with protein, carbs and fat split.
Open →Macro Calculator
Split calories into protein, carbs, and fat by strategy.
Open →Protein Calculator
Daily protein target tuned to your goal: loss, maintain or gain.
Open →Hydration Calculator
Daily hydration target in liters and ounces based on weight and activity.
Open →Creatine Calculator
Daily creatine maintenance dose based on body weight.
Open →Calorie Goal Planner
Personalized calorie target with deficit and surplus options.
Open →Planning
In development
Coming next — vote with your usage and these will ship first.
FFMI
Fat-free mass index for strength athletes.
🚀 Coming soonLean Body Mass
Estimate lean mass from body fat %.
🚀 Coming soonOne Rep Max
Estimate your 1RM from weight and reps.
🚀 Coming soonIntermittent Fasting
Plan your fasting and feeding windows.
🚀 Coming soonAdvanced Macros
Cycle macros across training and rest days.
🚀 Coming soon