Health Calculators

434 free health tools — instant answers, no signup.

Body composition, calorie needs, drug dosages, pregnancy tracking, blood test interpretation, fitness scores — health calculations are the kind of thing you want to get right the first time. Our health tools cover the formulas clinicians use in practice and the everyday calculations anyone managing their own health benefits from. Always sanity-check medical decisions with a professional, but compute the numbers here in seconds.

20/20 Vision Calculator 4Ts Score Calculator 6-Minute Walk Test Calculator 90 Minute Sleep Cycle Calculator A Body Shape Index (ABSI) Calculator AA Gradient Calculator ACFT Calculator AFT Calculator AHI Calculator ANC Calculator ANC Without Bands Calculator APACHE II Calculator APFT Calculator APGAR Score Calculator APRI Calculator AST/ALT Ratio Calculator AUDIT Test Calculator AUDIT-C Calculator Absolute Eosinophil Count Calculator Absolute Lymphocyte Count Calculator Absolute Reticulocyte Count Calculator Acetaminophen Overdose Calculator Acid-Base Calculator Added Sugar Intake Calculator Adderall Dosage Calculator Addiction Calculator Adjusted Age Calculator Adjusted Body Weight Calculator Adrenal Washout Calculator Age-Adjusted D-Dimer Calculator Air Force PT Calculator Albumin Creatinine Ratio Calculator Albumin Globulin Ratio Calculator Alcohol Units Calculator Aldrete Score Calculator Aleve Dosage Calculator Allowable Blood Loss Calculator Alvarado Score Calculator Alzheimer's Life Expectancy Calculator Amoxicillin Pediatric Dosage Calculator Anion Gap Calculator Ankle-Brachial Index Calculator Aortic Valve Area Calculator Army Body Fat Calculator Arterial Age Calculator Arterial Blood pH Calculator BAC Calculator BAI Calculator BASDAI Score Calculator BBT Calculator BED Calculator BIMS Calculator BMI Calculator BMI Weight Loss Calculator BMI for Kids Calculator BMI for Men Calculator BMI for Teens Calculator BMI for Women Calculator BMI in Pregnancy Calculator BMR Calculator BMR Harris-Benedict Equation Calculator BMR Katch-McArdle Calculator BODE Index Calculator BSA Calculator BUN/Creatinine Ratio Calculator Baby Eye Color Calculator Baby Formula Calculator Baby Percentile Calculator Baby's Milk Intake Calculator Back to Normal Life Calculator Barthel Index Calculator Basal Energy Expenditure Calculator Beighton Score Calculator Benadryl Dosage Calculator Benzodiazepine Conversion Calculator Berg Balance Test Calculator Bicarbonate Deficit Calculator Birth Control Cost Calculator Birthweight Percentile Calculator Bishop Score Calculator Bladder Volume Calculator Blood Donation Due Date Calculator Blood Donor Calculator Blood Pregnancy Test Calculator Blood Pressure Calculator Blood Sugar Converter Calculator Blood Type Calculator Blood Volume Calculator Body Fat Calculator Body Frame Size Calculator Body Roundness Index Calculator Body Shape Calculator Braden Score Calculator Breast Cancer Recurrence Risk Calculator Breast Cancer Risk Calculator Breast Pump Flange Size Calculator Breastfeeding Calorie Calculator CAGE Questionnaire Calculator CHA₂DS₂-VASc Calculator CIWA-Ar Calculator COVID Event Risk Calculator COVID-19 Mortality Risk Calculator CURB-65 Calculator CVD Risk Calculator Caffeine Calculator Calorie Calculator Calorie Deficit Calculator Car Heat Calculator Carbohydrates Calculator Carboplatin Calculator Cardiac Index Calculator Cardiac Output Calculator Cefdinir Dosage Calculator Centor Score Calculator Cerebral Perfusion Pressure Calculator Charlson Comorbidity Index Calculator Child BMI Percentile Calculator Child Height Percentile Calculator Child Weight Percentile Calculator Child-Pugh Calculator Cholesterol Ratio Calculator Cholesterol Units Calculator Cigarette Calculator Circadian Rhythm Calculator Clomid Ovulation Calculator Conception Date Calculator Corrected Calcium Calculator Corrected Magnesium Calculator Corrected Reticulocyte Count Calculator Creatinine Clearance Calculator Crohn's Disease Activity Index (CDAI) Calculator Crown-Rump Length Calculator DAPT Calculator DIC Syndrome Calculator DRI Calculator DUDIT Calculator Dead Space Calculator Denver HIV Risk Score Calculator Diabetes Risk Calculator Diabetic Ketoacidosis Calculator Diet Risk Score Calculator Diffuse Large B-Cell Lymphoma Prognosis Calculator Dog Walking Benefits Calculator Doppler Echo Cardiac Output Calculator Dosage Calculator Draw Length Calculator Drip Rate Calculator Drops Per Minute Calculator Drug Half-Life Calculator Duke Activity Status Index (DASI) Calculator Duke Treadmill Score Calculator EASI Score Calculator ECG Boxes to Seconds Calculator ECG Heart Rate Calculator EDD Calculator EER (Estimated Energy Requirement) Calculator EORTC Bladder Cancer Recurrence and Progression Calculator EPDS Calculator EROA Calculator Egg Freezing Calculator Endotracheal Tube Size Calculator Epworth Sleepiness Scale Calculator Estimate Height in Bedridden Patients Calculator Estimated Average Glucose Calculator Estimated Glomerular Filtration Rate (eGFR) Calculator EtG Calculator Excessive Weight Gain in Pregnancy Calculator Exclusive Pumping Calculator FENa Calculator FEUrea Calculator FEV1/FVC Ratio Calculator FFMI Calculator FIB-4 Calculator Face Shape Calculator Fagerstrom Test for Nicotine Dependence Calculator False Negative Pregnancy Test Calculator Fat Intake Calculator Fatigue Severity Scale Calculator Fertility by Age Calculator Fetal Weight Percentile Calculator Fiber Calculator Finnegan Score for NAS Calculator Fish Oil Calculator Frailty Index Calculator Framingham Risk Calculator Free Testosterone Calculator Fresh Frozen Plasma Dose Calculator Fundal Height Calculator GAD-7 Calculator GIR (Glucose Infusion Rate) Calculator GRACE Calculator Gabapentin Dosage Calculator Gastric Sleeve Weight Loss Calculator Geriatric BMI Calculator Gestational Age Calculator Glasgow Coma Scale Calculator Glycemic Index Calculator Glycemic Load Calculator Gorlin Formula Calculator Gout Diagnosis Calculator Gut Microbiome Score Calculator HAS-BLED Calculator HEART Score Calculator HOMA-IR Calculator HSI (Heaviness of Smoking Index) Calculator Hand Sanitizer Calculator Happiness Calculator Head Circumference Percentile Calculator Heart Failure Life Expectancy Calculator Height Calculator Hematocrit to Hemoglobin Calculator Hemoglobin A1c Calculator Hydroxychloroquine Dose Calculator ICH Calculator ICH Volume Calculator IIFYM Calculator INR Calculator IQ Percentile Calculator IV Flow Rate Calculator IVF Due Date Calculator IVIG Dose Calculator Ibuprofen Dosage Calculator Ideal Weight Calculator Implantation Calculator Incidence Rate Calculator Infant Tylenol Dosage Calculator Injury Severity Score Calculator Insulin Dosage Calculator Ireland Vaccine Queue Calculator Iron Deficiency Calculator Isotretinoin Calculator Karvonen Formula Calculator Keto Calculator Kidney Failure Risk Calculator Kidney STONE Calculator Kt/V Calculator LDL Cholesterol Calculator LRINEC Score Calculator LV Mass Index Calculator Lean Body Mass Calculator Levothyroxine Dosage Calculator Lidocaine Dose Calculator Light's Criteria Calculator Lille Score Calculator Local Anesthetic Calculator Lung Cancer Risk Calculator for Smokers Lung Capacity Calculator Lung Nodule Growth Rate Calculator Luteal Phase Calculator MCA Calculator MELD Calculator MEWS Score Calculator MICA Calculator MIPI Calculator Macro Calculator Maddrey's Discriminant Function Calculator Maintenance Calorie Calculator Maintenance Fluids for Children Calculator Malaysia Vaccine Queue Calculator Mask vs. No Mask Calculator Meal Calorie Calculator Mean Airway Pressure Calculator Mean Arterial Pressure Calculator Mean Sac Diameter Calculator Medical Radiation Calculator Medicine 3 Times A Day Calculator Melatonin Dosage Calculator Mentzer Index Calculator Metabolic Syndrome Calculator Metastatic Prostate Cancer Prognosis Calculator Micrograms to IU Converter Micronutrient Calculator Mitral Valve Area Calculator Morphine Milligram Equivalents (MME) Calculator Morse Fall Scale Calculator Mortality Rate Calculator NAFLD Fibrosis Score Calculator NEDOCS Calculator NIH Stroke Scale Calculator NLR Calculator NNT Calculator Navy Body Fat Calculator Navy PRT Calculator Net Carbs Calculator Newborn Hyperbilirubinemia Assessment Calculator Noise Exposure Time Calculator Nuchal Translucency Calculator Opioid Conversion Calculator Osteoporosis Risk Score Calculator Overweight Calculator Ovulation Calculator Oxygenation Index Calculator PECARN Calculator PERC Calculator PHQ-2 Depression Screening Calculator PISA Calculator PSA Density Calculator PSA Doubling Time Calculator PSI Calculator PaO2/FiO2 Ratio Calculator Pack Years Calculator Padua Score Calculator Paracetamol Dosage Calculator Parkland Formula Calculator Peak Flow Calculator Pearl Index Calculator Pediatric Blood Pressure Calculator Pediatric Blood Volume Calculator Pediatric Dose Calculator Pediatric Epinephrine Dose Calculator Pediatric Epworth Sleepiness Scale Calculator Pediatric GFR Calculator Pediatric Transfusion Volume Calculator Peptide Dosage Calculator Period Calculator Plasma Osmolality Calculator Plasma Volume Calculator Pokémon Go Weight Loss Calculator Ponderal Index Calculator Positive Pregnancy Test Calculator Pregnancy Due Date Calculator Pregnancy Test Calculator Pregnancy Test at 3 Weeks Calculator Pregnancy Weight Gain Calculator Pregnancy Weight Gain Calculator Prescription Refill Calculator Progesterone to Estradiol Ratio Calculator Protein Calculator Protein Creatinine Ratio Calculator Pulmonary Vascular Resistance Calculator QTc Calculator QUICKI Calculator Qp/Qs Ratio Calculator Quarantine Activity Calculator RBC Indices Calculator REM Sleep Calculator RMR Calculator RSBI Calculator Radiation Dose Calculator Rate Pressure Product Calculator Relative Fat Mass Calculator Reverse Due Date Calculator Revised Cardiac Risk Index Calculator Revised Geneva Score Calculator Revised Trauma Score Calculator SAAG Calculator SAPS II Calculator SCORAD Calculator SIR Model Epidemic Calculator SNAP Score Calculator SOFA Score Calculator STOP-BANG Calculator Sepsis-3 Criteria Calculator Serum Osmolality Calculator Shock Index Calculator Simple Calorie Intake Calculator Skinfold Body Fat Calculator Sleep Calculator Sleep Cycle Calculator Sleep Debt Calculator Sleep Time Calculator Smoking Recovery Calculator Sobriety Calculator Social Distancing Calculator Sodium Change in Hypertriglyceridemia Calculator Sodium Correction Calculator Sodium Correction Rate Calculator Sodium Deficit Calculator Sodium in Salt Calculator South Africa Vaccine Queue Calculator Sperm Analysis Calculator Standard Drink Calculator Steroid Conversion Calculator Stillbirth Risk Calculator Stroke Volume Calculator Swiss Cheese Coronavirus Protection Calculator TDEE Calculator TI-RADS Calculator TIMI Score for STEMI Calculator TIMI Score for UA/NSTEMI Calculator TTKG Calculator Testosterone to Estradiol Ratio Calculator Tidal Volume Calculator Time of Death Calculator Tinetti Calculator Total Body Water Calculator Tramadol Dosage Calculator Transferrin Saturation Calculator Twin Pregnancy Weight Gain Calculator Twins Calculator Tylenol Dosage Calculator URR Calculator US Vaccine Strategy Calculator Urine Anion Gap Calculator Urine Output Calculator Urine Pregnancy Test Calculator VBAC Risk Score Calculator VLDL Calculator VTE Risk in Pregnancy Calculator Vaccine Efficacy Calculator Vaccine Immunity Calculator Vaccine Production Calculator Vaccine Queue Australia Calculator Vaccine Queue Calculator for India Vaccine Queue Canada Calculator Vaccine Queue England Calculator Vaccine Queue Netherlands Calculator Vaccine Queue Northern Ireland Calculator Vaccine Queue Philippines Calculator Vaccine Queue Scotland Calculator Vaccine Queue UK Calculator Vaccine Queue Wales Calculator Venous Blood pH Calculator Vital Capacity Calculator Vitamin A Calculator Vitamin Calculator Vitamin D Calculator Waist-Hip Ratio Calculator Waist-to-Height Ratio Calculator Wake Up Calculator Warfarin Dosing Calculator Warsaw Method Calculator Water Deficit Calculator Water Intake Calculator Weight Gain Calculator Weight Gain During Pregnancy Calculator Weight Loss Percentage Calculator Weight Watchers Points Calculator Wells PE Calculator Winters' Formula Calculator hCG Levels Calculator mmol/L to mg/dL Calculator qSOFA Calculator tPA Calculator