Free Fitness Calculators
Estimate your TDEE, BMR, one-rep max, macros, body fat percentage, and more with our free online fitness calculators.
All Calculators
TDEE Calculator
Calculate your Total Daily Energy Expenditure based on age, weight, height, and activity level
One Rep Max Calculator
Estimate your one-rep max from submaximal lifts using the Epley formula
Macro Calculator
Calculate your daily protein, carb, and fat targets based on goals and body stats
Calories Burned Calculator
Estimate calories burned during specific exercises based on body weight and duration
BMR Calculator
Calculate your Basal Metabolic Rate using the Mifflin-St Jeor equation
Body Fat Percentage Calculator
Estimate body fat percentage using body measurements (Navy method)
Water Intake Calculator
Calculate recommended daily water intake based on weight and activity level
Protein Intake Calculator
Calculate optimal daily protein intake based on goals and body composition
Why Use Fitness Calculators?
Understanding your body's energy needs, strength levels, and nutritional requirements is the foundation of any effective fitness program. These calculators use scientifically validated formulas to give you personalized targets based on your unique stats.
Whether you are trying to lose weight, build muscle, or improve athletic performance, knowing your numbers helps you train smarter and eat right. Pair these calculators with Fitnit AI-powered workout tracking for a complete fitness solution.
Start Training Smarter
Calculate your targets, then let Fitnit AI track your workouts with real-time rep counting, form analysis, and flexible nutrition tracking. Earn money by referring friends.
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