Free Fitness Calculators
Accurate, fast, and easy-to-use tools to help you reach your fitness goals. No sign-up required.
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Pick a path and we'll guide you through the right tools.
Quick Check — What's your BMI?
Get an instant snapshot. Takes 10 seconds.
Want more detail? See the full BMI Calculator with explanations and health context.
All Calculators
TDEE Calculator
Find out how many calories you burn per day based on your body stats and activity level.
Try it freeBody CompBMI Calculator
Calculate your Body Mass Index and see where you fall on the healthy weight scale.
Try it freeBody CompBody Fat Calculator
Estimate your body fat percentage using the US Navy method. Just needs a tape measure.
Try it freeStrengthOne-Rep Max Calculator
Estimate your one-rep max from any weight and rep count. Includes training percentage charts.
Try it freeNutritionMacro Calculator
Get your daily protein, carbs, and fat targets based on your goals and preferred diet style.
Try it freeWeight LossCalorie Deficit Calculator
Plan your weight loss with a daily calorie target and timeline estimate for your goal.
Try it freeNutritionProtein Calculator
Find your optimal daily protein intake based on body weight and fitness goals.
Try it freeBody CompIdeal Weight Calculator
Calculate your ideal body weight using four established medical formulas.
Try it freeWhy FitCalc?
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Instant Results
Get your numbers in seconds. No waiting, no loading screens.
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Science-Backed
Uses peer-reviewed formulas trusted by fitness professionals.
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100% Free
No sign-up, no paywalls. All calculators are completely free.