Health & Fitness
These calculators implement named, peer-reviewed formulas rather than invented scoring: Mifflin-St Jeor for resting metabolism, the US Navy circumference method for body fat, Riegel for race prediction, Karvonen for heart-rate zones, Cockcroft-Gault for renal function. Each page states which equation it uses so you can check it against the source. They estimate population averages and are not a substitute for professional assessment.
Collections in Health & Fitness
4 groups · 60 pagesNutrition & Energy Calculators19 calculators covering metabolic rate, energy needs and macros, each with its formula and worked examples.19 calculatorsTraining Calculators15 calculators covering pace, race prediction, VO₂ max and heart-rate zones, each with its formula and worked examples.15 calculatorsBody Metric Calculators14 calculators covering BMI and the other body composition indices, each with its formula and worked examples.14 calculatorsClinical Index Calculators12 calculators covering blood pressure, renal function and similar indices, each with its formula and worked examples.12 calculators
BMR CalculatorBasal metabolic rate from Mifflin-St Jeor, with Harris-Benedict alongside for comparison.Running Pace CalculatorPace, speed and finish time for any distance, with splits for the standard race distances.
All Health & Fitness calculators
58 focused tools built on the flagship models above.
Adjusted Body Weight CalculatorAlcohol Units CalculatorApgar Score CalculatorBAC Estimate CalculatorBarbell Plate Loading CalculatorBlood Pressure Category CalculatorBMI CalculatorBMI Prime CalculatorBody Fat From BMI CalculatorBody Frame Size CalculatorBody Surface Area CalculatorBulking Calories CalculatorCaffeine Half-Life CalculatorCalorie Deficit CalculatorCalories Burned Cycling CalculatorCalories Burned Running CalculatorCalories Burned Swimming CalculatorCalories Burned Walking CalculatorCarb Cycling CalculatorChild Height Prediction CalculatorCreatinine Clearance CalculatorCutting Calories CalculatorCycling Power to Weight CalculatoreGFR CalculatorFFMI CalculatorFibre Intake CalculatorGlasgow Coma Scale CalculatorHealthy Weight Range CalculatorHeart Rate Zones CalculatorIdeal Body Weight CalculatorLean Body Mass CalculatorMacro Split CalculatorMaximum Heart Rate CalculatorMean Arterial Pressure CalculatorMET Calorie CalculatorNavy Body Fat CalculatorOne Rep Max CalculatorOvulation Window CalculatorPonderal Index CalculatorPregnancy Due Date CalculatorProtein Intake CalculatorPulse Pressure CalculatorQTc CalculatorRace Time PredictorRowing Split CalculatorSleep Cycle Bedtime CalculatorStair Climbing Calories CalculatorSteps to Distance CalculatorSwim Pace CalculatorTarget Heart Rate CalculatorTDEE CalculatorTreadmill Incline Pace ConverterVO2 Max CalculatorWaist to Height Ratio CalculatorWaist to Hip Ratio CalculatorWater Intake CalculatorWeight Loss Timeline CalculatorWilks Score Calculator