Health calculators
64 free health tools, each with the formula and step-by-step working.
- A1C CalculatorConvert A1C to average blood glucose.
- Adjusted Body Weight CalculatorIBW and adjusted weight for dosing.
- Alcohol Units CalculatorUnits and standard drinks in a beverage.
- Anion Gap CalculatorAnion gap with albumin correction and delta ratio.
- Baby Weight Percentile CalculatorWhere your baby's weight sits.
- Blood Alcohol CalculatorEstimated BAC and hours until sober.
- Blood Pressure CalculatorCategory, MAP and pulse pressure.
- BMI CalculatorBody mass index with the healthy weight range for your height.
- BMR CalculatorCalories your body burns at complete rest.
- Body Fat CalculatorUS Navy method body fat from tape measurements.
- Body Surface Area CalculatorBSA by Mosteller, Du Bois and Haycock formulas.
- Caffeine Half-Life CalculatorSee how much caffeine is still in your system at bedtime.
- Calorie Deficit CalculatorDaily calories to lose a target amount by a chosen date.
- Calories Burned CalculatorEnergy burnt in any activity using MET values.
- Carb CalculatorDaily carbohydrate target.
- Child BMI CalculatorBMI and category for children.
- Cholesterol Ratio CalculatorTotal to HDL ratio and LDL estimate.
- Corrected Calcium CalculatorCalcium adjusted for low albumin.
- Creatinine Clearance CalculatorCockcroft-Gault kidney function.
- Daily Water Intake CalculatorHow much to drink for your weight, climate and training.
- Days Supply CalculatorPharmacy days-supply for tablets, liquids, inhalers and insulin.
- Due Date CalculatorEstimated delivery date and pregnancy milestones.
- eGFR CalculatorKidney function estimate from serum creatinine.
- FENa CalculatorDistinguish prerenal from intrinsic renal azotemia in seconds.
- Fiber Intake CalculatorDaily fibre target and your gap.
- Gestational Age CalculatorWeeks pregnant from LMP.
- Glucose Conversion Calculatormg/dL to mmol/L blood sugar.
- Goal Weight Date CalculatorWhen you'll hit your target at your current rate.
- Heart Rate Zone CalculatorFive training zones from your max and resting heart rate.
- Ideal Weight CalculatorFour classic formulas plus the healthy BMI range.
- Insulin Dose CalculatorMeal bolus and correction dose.
- Intermittent Fasting CalculatorFasting and eating window schedule.
- IV Drip Rate CalculatorDrops per minute for an infusion.
- Jet Lag Recovery CalculatorHow many days to adjust, and when to seek light.
- Keto Macro CalculatorKetogenic fat, protein and carb split.
- Lean Body Mass CalculatorEverything that isn't fat: muscle, bone, organs and water.
- Macro CalculatorProtein, carbs and fat grams for your calorie target.
- Meal Calorie CalculatorCalories from macros in a meal.
- Metabolic Age CalculatorCompare your BMR to age norms.
- METs CalculatorExercise intensity and calories from METs.
- One Rep Max CalculatorEstimated 1RM plus a full percentage training table.
- Ovulation CalculatorFertile window and ovulation day from your cycle.
- Pack Year CalculatorSmoking history in pack years.
- Pediatric Dose CalculatorWeight-based dosing for children.
- Pregnancy Due Date CalculatorDue date and trimester milestones from your last period.
- Pregnancy Weight Gain CalculatorRecommended gain by BMI and week.
- Protein Intake CalculatorDaily protein target based on weight and training.
- Pulse Pressure CalculatorDifference between systolic and diastolic.
- Rucking Calorie CalculatorCalories burned rucking, using the Pandolf load-carriage equation.
- Running Pace CalculatorPace, finish time and splits for any distance.
- Sauna Calorie CalculatorEstimate calories burned during a sauna session from weight, temperature and time.
- Sleep CalculatorBest bedtimes and wake times by sleep cycle.
- Sleep Cycle CalculatorBedtimes that let you wake between cycles, not mid-cycle.
- Sodium Correction CalculatorCorrected sodium for hyperglycaemia.
- Steps to Miles CalculatorConvert step count to distance and calories.
- Sweat Rate CalculatorFluid lost per hour, and what to drink back.
- TDEE CalculatorTotal daily energy expenditure and macro targets.
- Vitamin D CalculatorDose to reach a target blood level.
- VO2 Max CalculatorAerobic fitness from a 1.5-mile run or Cooper test.
- Waist to Height Ratio CalculatorA better risk marker than BMI, in one measurement.
- Waist to Hip Ratio CalculatorBody shape and health risk.
- Walking Time CalculatorHow long a walk takes at your pace, including hills.
- Weight Loss Percentage CalculatorPercent of body weight lost.
- Wilks Score CalculatorCompare powerlifting totals across bodyweights.
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