Health and fitness calculators
BMI, calories, TDEE, body fat, macros, protein, due dates, heart rate, pace and sleep, from published formulas with sources.
BMI calculatorBody mass index with the adult category, healthy weight range and BMI Prime.Body fat calculatorBody fat % from a tape measure (U.S. Navy method), with the ACE chart.Ideal weight calculatorRobinson, Miller, Devine and Hamwi formulas plus the BMI healthy range.Lean body mass calculatorLean body mass from height and weight (Boer, James and Hume).BMR calculatorCalories burned at rest: Mifflin–St Jeor, Harris–Benedict, Katch–McArdle.TDEE calculatorTotal daily energy expenditure at every activity level.Calorie calculatorDaily calories to maintain, lose or gain weight at a steady rate.Macro calculatorProtein, carb and fat grams from a calorie target.Protein calculatorDaily protein from the RDA and sports nutrition ranges.Due date calculatorEstimated due date from your last period, conception, IVF transfer or ultrasound.Ovulation calculatorEstimated ovulation day and fertile window for the next few cycles.Pace calculatorRunning pace, time or distance, with splits and race-time predictions.One rep max calculatorEstimated 1RM from weight and reps, with a percent-of-max table.Target heart rate calculatorMax heart rate and moderate and vigorous zones, with the Karvonen method.Calories burned calculatorCalories burned for 60+ everyday activities from MET values, weight and minutes.Sleep calculatorWhen to go to bed or wake up, using 90-minute sleep cycles.Steps to calories calculatorCalories burned from steps or miles walked or run, by pace and body weight, with a chart.Body recomposition calculatorRecomp calories (maintenance or a small deficit) plus a daily protein target.Breastfeeding calorie calculatorEstimated daily calories while breastfeeding: maintenance plus the extra for milk.A1C calculatorA1C to estimated average glucose (eAG) in mg/dL and mmol/L, and back (ADA formula).Blood volume calculatorTotal blood volume from height, weight and sex with Nadler's formula.Fat mass calculatorFat and lean mass from body fat %, with fat mass index (FMI) and a target weight.Steps to miles calculatorSteps to miles or km, and distance to steps, from your step length or height.PAL calculatorPhysical activity level from TDEE ÷ BMR or from your daily activities (FAO/WHO/UNU).
These calculators give general estimates from published formulas. They aren't medical advice and can't diagnose anything. Talk to a doctor about your own health.