Tools
Fitness & Health Calculators
28 free calculators, every formula grounded in published research: Mifflin-St Jeor, US Navy tape test, Karvonen, CKD-EPI, Widmark, and more.
Fitness
- BMI CalculatorBody mass index and where it lands on the WHO scale.Open calculator →
- Calorie CalculatorDaily calories to maintain, lose, or gain weight.Open calculator →
- Body Fat CalculatorBody fat percentage from tape measurements (US Navy method).Open calculator →
- BMR CalculatorCalories your body burns at complete rest.Open calculator →
- Ideal Weight CalculatorIdeal body weight by four published formulas.Open calculator →
- Pace CalculatorRunning pace, speed, and split times from distance and time.Open calculator →
- Army Body Fat CalculatorUS Army AR 600-9 tape-test body fat and pass thresholds.Open calculator →
- Lean Body Mass CalculatorLean mass by the Boer, James, and Hume formulas.Open calculator →
- Healthy Weight CalculatorThe healthy weight range for your height.Open calculator →
- Calories Burned CalculatorCalories burned for common workouts, from MET values.Open calculator →
- One Rep Max CalculatorEstimate your 1RM from any set, plus training percentages.Open calculator →
- Target Heart Rate CalculatorTraining heart rate zones by the Karvonen method.Open calculator →
- FFMI CalculatorFat-free mass index: muscularity normalized for height.Open calculator →
- Bench Press CalculatorMax bench estimate with 5% loading jumps for programming.Open calculator →
- Ideal Body Measurements CalculatorClassic aesthetic proportions from your wrist size.Open calculator →
Nutrition & Health
- Macro CalculatorDaily protein, carbs, and fat for your goal.Open calculator →
- Carbohydrate CalculatorDaily carbohydrate targets from your calorie needs.Open calculator →
- Protein CalculatorDaily protein needs for health, training, and fat loss.Open calculator →
- Fat Intake CalculatorDaily fat targets within the healthy range.Open calculator →
- TDEE CalculatorTotal daily energy expenditure at every activity level.Open calculator →
- GFR CalculatorEstimated kidney filtration rate (CKD-EPI 2021).Open calculator →
- Body Type CalculatorFrame size and body type from your measurements.Open calculator →
- Body Surface Area CalculatorBSA by the Du Bois and Mosteller formulas.Open calculator →
- BAC CalculatorEstimated blood alcohol concentration over time.Open calculator →
- Water Intake CalculatorDaily water target from your weight, training, and climate.Open calculator →
- Blood Pressure CalculatorWhere a reading falls on the ACC/AHA categories.Open calculator →
- Creatine CalculatorDaily and loading-phase creatine doses for your weight.Open calculator →
- Period CalculatorPredicts your next periods and fertile window.Open calculator →
