Health & Fitness Calculators
Check your BMI, daily calories and calories burned, heart rate zones and body fat, and work out a pregnancy due date or fertile window — with the formulas and figures of the CDC, the Dietary Guidelines, ACOG and the research they rely on. For information only, not medical advice.
97 calculators · A–Z of all calculators
- BMI CalculatorBody mass index and the CDC category for adults.
- Calorie CalculatorDaily calorie needs by age and activity, and resting calories.
- BMR CalculatorCalories you burn at rest, two standard equations.
- Protein CalculatorDaily protein allowance from your weight.
- Fiber Intake CalculatorDaily fiber by age and sex.
- Macro CalculatorGrams of carbs, protein and fat for your calories.
- Water Intake CalculatorHow much water a day, by the National Academies.
- Standard Drink CalculatorUS standard drinks in any beer, wine or spirit.
- Calories Burned CalculatorCalories burned walking, running, cycling and more.
- One Rep Max CalculatorEstimate your 1RM from any set of reps.
- Ideal Weight CalculatorDevine formula weight and the healthy BMI range.
- Body Fat CalculatorBody fat percentage by the Navy tape measure method.
- Lean Body Mass CalculatorLean mass by the Boer, James and Hume formulas.
- Waist-to-Hip Ratio CalculatorYour WHR and the WHO risk cutoffs.
- Waist-to-Height Ratio CalculatorYour WHtR and the NICE categories.
- Body Surface Area CalculatorBSA by the Mosteller, Du Bois and Haycock formulas.
- Total Body Water CalculatorBody water by the Watson formula.
- Blood Volume CalculatorNadler blood volume estimate.
- Army Body Fat CalculatorThe 2026 Army waist-to-height standard.
- Target Heart Rate CalculatorMaximum heart rate and exercise zones by age.
- Heart Rate Reserve CalculatorKarvonen target heart rate zones.
- VO2 Max CalculatorVO2 max from the Cooper 12-minute run.
- Race Time Predictor5K to marathon times from one race.
- Pack-Year CalculatorPack-years and lung screening criteria.
- Due Date CalculatorPregnancy due date and how far along you are.
- Pregnancy Week CalculatorHow many weeks pregnant you are, on any date.
- Conception CalculatorEstimated conception date and fertile window.
- Adjusted Age CalculatorCorrected age for premature babies.
- Ovulation CalculatorFertile window and ovulation date for the next cycles.
- Period CalculatorWhen your next periods are due.
- Pregnancy Weight Gain CalculatorRecommended gain by pre-pregnancy BMI, IOM guidelines.
- A1C CalculatorA1C to average blood sugar and back.
- Corrected Calcium CalculatorCalcium adjusted for albumin.
- Serum Osmolality CalculatorCalculated osmolality and gap.
- Anion Gap CalculatorAnion gap with albumin correction.
- Corrected Sodium CalculatorSodium corrected for high glucose.
- eGFR CalculatorKidney function by the CKD-EPI 2021 equation.
- Creatinine Clearance CalculatorCockcroft-Gault estimate in mL/min.
- Blood Pressure CalculatorYour reading on the AHA category chart.
- LDL Cholesterol CalculatorFriedewald LDL from a lipid panel.
- Mean Arterial Pressure CalculatorMAP from systolic and diastolic.
- QTc CalculatorCorrected QT by four formulas.
- IV Drip Rate CalculatorDrops per minute and mL per hour.
- Maintenance Fluid CalculatorHolliday-Segar and 4-2-1 rule.
- Sleep CalculatorBedtime or wake-up time by sleep cycles.
- BMI Calculator for Children and TeensBMI-for-age percentile and CDC category, ages 2–19.
- Baby Growth Percentile CalculatorWeight, length and head percentiles on the CDC charts.
- Child Height Predictor CalculatorAdult height from the parents’ heights, with range.
- BAC CalculatorRough blood alcohol range from drinks, weight and time.
- HOMA-IR CalculatorInsulin resistance index from fasting glucose and insulin.
- Caffeine in Body CalculatorCaffeine left at bedtime and when it drops to your level.
- VDOT CalculatorVDOT from a race, equivalent times and training paces.
- Steps to Miles CalculatorSteps to miles, time and calories, or steps for a distance.
- Glasgow Coma Scale CalculatorGCS total from eye, verbal and motor scores (educational).
- Apgar Score CalculatorNewborn Apgar score from the five signs, out of 10.
- Powerlifting DOTS CalculatorDOTS score from bodyweight and total, or the total for a target.
- Baby Formula Amount CalculatorOunces of formula per day and per feeding by weight (AAP).
- Herd Immunity CalculatorThreshold from R0, vaccine coverage needed, and a simple SIR model.
- PHQ-9 CalculatorPHQ-9 depression screening score, 0 to 27.
- GAD-7 CalculatorGAD-7 anxiety screening score, 0 to 21.
- CURB-65 CalculatorPneumonia severity score from five bedside findings.
- CHA2DS2-VASc CalculatorStroke risk score in atrial fibrillation, 0 to 9.
- Centor Score CalculatorModified Centor (McIsaac) score for a sore throat.
- Parkland Formula CalculatorBurn fluid estimate: 4 mL x kg x % burned over 24 hours.
- Sunscreen CalculatorHow much sunscreen to use, how often, what SPF blocks.
- Breast Milk Storage CalculatorUse-by time for expressed milk: counter, fridge, freezer (CDC).
- Contraction TimerTime contractions and check the 5-1-1 rule.
- Sleep Needs by Age CalculatorHours of sleep for babies, kids, teens and adults, with bedtime.
- Pregnancy Calories CalculatorExtra calories by trimester, BMI and while breastfeeding.
- Kick Count CalculatorLog time to 10 baby movements; the 10-in-2-hours check.
- Diaper Count CalculatorNewborn wet and dirty diapers by day against the AAP guide.
- Cycling Power Zones CalculatorYour FTP, or a 20-minute test, as seven Coggan zones in watts.
- Sweat Rate CalculatorYour sweat loss per hour from weight before and after exercise.
- Rucking Calories CalculatorCalories burned walking with a loaded pack, by Pandolf and Army LCDA.
- Body Roundness Index CalculatorYour BRI from waist and height, with the 2024 NHANES groups.
- FIB-4 CalculatorLiver fibrosis index from age, AST, ALT and platelets (educational).
- MELD Score CalculatorMELD, MELD-Na and MELD 3.0 from six lab values (educational).
- Child-Pugh Score CalculatorCirrhosis class A, B or C from five findings (educational).
- Wells Score CalculatorWells criteria for DVT and pulmonary embolism (educational).
- NEWS2 CalculatorNational Early Warning Score 2 from seven bedside observations (educational).
- Free Water Deficit CalculatorWater deficit in hypernatremia and the Adrogue-Madias 1-liter sodium change (educational).
- Noise Dose CalculatorOSHA and NIOSH noise dose and 8-hour TWA for a shift of several dBA levels.
- WBGT Heat Stress CalculatorWet bulb globe temperature checked against the NIOSH heat alert and exposure limits.
- NIOSH Lifting Equation CalculatorRecommended weight limit and lifting index for a manual lift, in lb or kg.
- Glycemic Load CalculatorGlycemic load per serving and per day from GI and carbs.
- Vitamin IU ConverterIU to mcg or mg for vitamins A, D, E and folate DFE.
- Alcohol Calories CalculatorCalories in beer, wine, spirits or a cocktail from volume and ABV.
- Weight Change Timeline CalculatorWeeks to a goal weight: the 3,500-calorie rule vs an adaptive model.
- Added Sugar CalculatorAdded sugar in grams, teaspoons and calories against AHA limits.
- Sodium Intake CalculatorSodium in your meals vs the 2,300 mg limit; sodium to salt.
- Visual Acuity ConverterSnellen, decimal, logMAR and ETDRS letters.
- Spherical Equivalent CalculatorSphere plus half cylinder; plus and minus cylinder.
- Vertex Distance CalculatorGlasses power to contact lens power.
- Reading Add CalculatorEstimated near add by age and distance.
- Lens Thickness CalculatorEdge and center thickness by index.
- Rowing Pace to Watts CalculatorConcept2 split per 500 m to watts and back, 2000 m time, calories per hour.
- Race Splits CalculatorEven, negative and positive split tables per mile or km for a goal time.