12 free tools · No sign-up
Fitness calculators, backed by science.
Calories, macros, body fat, and fat-loss timelines. Every tool shows the formula behind its number, so you know exactly where it comes from.
12 calculators shown
- Calories & energyTDEE CalculatorEstimate your maintenance calories from your BMR and activity level, with a lean-mass estimate if you know your body fat.
- Fat lossFat Loss CalculatorPick a weekly rate of loss and get your daily calorie target and a timeline to your goal weight.
- Body compositionBody Fat CalculatorEstimate your body-fat percentage with a tape measure, using the U.S. Navy circumference method.
- NutritionFat-Loss Macro CalculatorEstimate maintenance from bodyweight × an activity factor, then set your deficit and a protein, fat, and carb split, with every step shown.
- NutritionMacro CalculatorTurn your calories into daily grams of protein, carbohydrate, and fat for your goal.
- Calories & energyBMR CalculatorEstimate the calories your body burns at complete rest with the Mifflin-St Jeor equation.
- Body compositionBMI CalculatorCalculate your body mass index from height and weight and see which category it falls in.
- NutritionProtein CalculatorFind your daily protein target and range from your body weight and goal.
- NutritionWater Intake CalculatorEstimate how much water you need each day from your body weight and training time.
- Fat lossCalorie Deficit CalculatorTurn a weekly weight-loss pace into a daily calorie deficit and intake target.
- Body compositionIdeal Weight CalculatorCompare the Devine ideal-weight formula with the healthy BMI weight range for your height.
- Fat lossWeight Goal Timeline CalculatorEstimate how many weeks it takes to reach your goal weight at a steady weekly rate.