Health Calculators

Welcome to CalculatorCave’s Health Calculators Hub — your trusted destination for accurate, science-based medical and health calculations. Whether you’re a doctor, nurse, medical student, fitness trainer, or simply health-conscious, our collection of over 400 free health calculators helps you make informed decisions about your body and well-being.

Wondering what your BMI means, how much water you should drink, or what your cardiovascular risk is? You’ll find clear, data-driven answers here. Our calculators are built on proven medical formulas — from the Mifflin-St Jeor Equation for calories to the CURB-65 and MELD Score for clinical assessments.

From tracking your sleep cycle to calculating your protein intake or kidney function, our tools cover every major area of health — all in one place.
Try them now and take control of your health with confidence.

Body measurements calculators 📏

ABSI Calculator
Adjusted Body Weight Calculator
BAI Calculator – Body Adiposity Index
Body Fat Calculator
Body Frame Size Calculator
Body Shape Calculator
BRI Calculator — Body Roundness Index
BSA Calculator – Body Surface Area
Draw Length Calculator
Bedridden Patient Height Calculator
Face Shape Calculator
FFMI Calculator (Fat-Free Mass Index)
Ideal Weight Calculator
Karvonen Formula Calculator
Lean Body Mass Calculator
Overweight Calculator
Ponderal Index Calculator
RFM Calculator (Relative Fat Mass)
Skinfold Body Fat Calculator
Waist to Hip Ratio Calculator
Waist to Height Ratio Calculator
Weight Loss Percentage Calculator

BMI calculators ⚖️

BMI Calculator – Body Mass Index
BMI Calculator for Kids
BMI Calculator for Men
BMI Calculator for Teens
BMI Calculator for Women
BMI Weight Loss Calculator
Geriatric BMI Calculator

Army & fitness calculators 🎖️

ACFT Calculator
Air Force PT Calculator
APFT Calculator
Army Body Fat Calculator
Navy Body Fat Calculator
Navy PRT Calculator

Dietary & nutrition calculators 🥗

Added Sugar Intake Calculator
BEE Calculator
Harris-Benedict Calculator (Basal Metabolic Rate)
Katch-McArdle Calculator
BMR Calculator (Basal Metabolic Rate, Mifflin-St Jeor Equation)
Calorie Calculator
Calorie Deficit Calculator
Carb Calculator (Carbohydrates)
Diet Risk Score Calculator
DRI Calculator
EER Calculator — Estimated Energy Requirement
Fat Intake Calculator
Fiber Calculator
Gastric Sleeve Weight Loss Calculator
IIFYM Calculator (If It Fits Your Macros)
Keto Calculator
Macro Calculator
Maintenance Calorie Calculator
Meal Calorie Calculator
Micronutrient Calculator
Net Carbs Calculator
Protein Calculator
Quarantine Activity Calculator
RMR Calculator – Resting Metabolic Rate
Calorie Intake Calculator (Simple)
Sodium in Salt Calculator
TDEE Calculator – Total Daily Energy Expenditure
Vitamin Calculator
Vitamin A Calculator
Vitamin D Calculator
Weight Gain Calculator
Weight Watchers Points Calculator

Diabetes calculators 💉

Blood Sugar Converter
Diabetes Risk Calculator
Diabetic Ketoacidosis Calculator
Estimated Average Glucose Calculator
Glycemic Index Calculator
Glycemic Load Calculator
A1c Calculator – Hemoglobin A1c to Average Blood Sugar
HOMA-IR Calculator — Insulin Resistance
Insulin Dosage Calculator
QUICKI Calculator
Warsaw Method Calculator

Metabolic disorders calculators 🍟

Cholesterol Ratio Calculator
Cholesterol Units Converter
Gout Diagnosis Calculator
LDL Calculator
Metabolic Syndrome Calculator
SAAG Calculator – Serum-Ascites Albumin Gradient
VLDL Calculator

Sleep calculators 😴

AHI Calculator | Apnea-Hypopnea Index
Epworth Sleepiness Scale Calculator
Pediatric Epworth Sleepiness Scale Calculator
Sleep Calculator
Sleep Debt Calculator
STOP-BANG Calculator

Cardiovascular system calculators ❤️

6 Minute Walk Test Calculator
ABI Calculator (Ankle-Brachial Index)
Aortic Valve Area Calculator
Arterial Age Calculator
Blood Pressure Calculator
Cardiac Index Calculator
Cardiac Output Calculator
Cerebral Perfusion Pressure Calculator
CHA2DS2-Vasc Calculator
CVD Risk Calculator – Cardiovascular Disease 10-year Risk
DAPT calculator
Doppler Echo Cardiac Output Calculator
Duke Treadmill Score Calculator
ECG Boxes to Seconds Calculator
ECG Heart Rate Calculator
EROA – Mitral Regurgitation Calculator
Framingham Risk Calculator
Gorlin Formula Calculator
GRACE Calculator
Gupta Risk Calculator
HAS-BLED Calculator
Heart Failure Life Expectancy Calculator
HEART Score Calculator
ICH Volume Calculator
LV Calculator
MAP Calculator (Mean Arterial Pressure)
Mitral Valve Area Calculator
Padua Score Calculator
PERC Calculator – Pulmonary Embolism Rule-Out Criteria
PISA Calculator
Wells Score Calculator for Pulmonary Embolism
PVR Calculator – Pulmonary Vascular Resistance
QTc Calculator
Rate Pressure Product Calculator
RCRI Calculator
Revised Geneva Score Calculator for Pulmonary Embolism
Stroke Volume Calculator
TIMI Score for STEMI Calculator
TIMI Score Calculator for UA/NSTEMI

Gynecology & pregnancy calculators 🤰

BBT Calculator | Basal Body Temperature
Birth Control Calculator
Bishop Score Calculator
Breast Cancer Recurrence Risk Calculator
Breast Cancer Risk Calculator
Breastfeeding Calorie Calculator
Clomid Ovulation Calculator
Conception Calculator
Crown-rump Length Calculator
Due Date Calculator
EDD Calculator – Estimated Date of Delivery
Egg Freezing Calculator
Fertility by Age Calculator
Flange Size Calculator
Fundal Height Calculator
Gestational Age Calculator
hCG Levels Calculator
Implantation Calculator
IVF Due Date Calculator
Luteal Phase Calculator
MCA Calculator
Mean Sac Diameter Calculator
Nuchal Translucency Calculator
Ovulation Calculator
Pearl Index Calculator
Period Calculator
Pregnancy Test Calculator
Pregnancy Weight Gain Calculator
Progesterone to Estrogen Ratio Calculator
Reverse Due Date Calculator
Sperm Analysis Calculator
Stillbirth Risk Calculator
Testosterone to Estradiol Ratio Calculator
Chances of Having Twins Calculator
VBAC Calculator (Vaginal Birth After Cesarean Section)
VTE Risk Score Calculator in Pregnancy

Addiction medicine calculators 🚬

Addiction Calculator
Alcohol Unit Calculator
Audit-C Calculator – Am I an Alcoholic?
Audit Score Calculator
BAC Calculator (Blood Alcohol Content)
Caffeine Calculator
CAGE Questionnaire Calculator
Cigarette Calculator
CIWA Calculator
DUDIT Calculator
Fagerstrom Test for Nicotine Dependence Calculator
Finnegan Score Calculator
HSI Calculator — Heaviness of Smoking Index
Pack Year Calculator
Smoking Recovery Calculator
Sobriety Calculator
Standard Drink Calculator

Urology & nephrology calculators 🚽

Adrenal Washout Calculator
Albumin Creatinine Ratio Calculator
Bladder Volume Calculator
BUN Creatinine Ratio Calculator
Creatinine Clearance Calculator
EORTC Bladder Cancer Recurrence and Progression Calculator
FENa Calculator (Fractional Excretion of Sodium)
FEUrea Calculator — Acute Kidney Injury Cause Differentiation
GFR Calculator – Estimated Glomerular Filtration Rate
Kidney Failure Risk Calculator
Kidney STONE Calculator for Percutaneous Neprolithotomy
Kt/V Calculator Daugirdas
Metastatic Prostate Cancer Prognosis Calculator
Protein Creatinine Ratio Calculator
PSA Density Calculator
PSA Doubling Time Calculator
TTKG Calculator – Transtubular Potassium Gradient
Urine Output Calculator
URR Calculator – Urea Reduction Ratio

Electrolytes & fluids calculators 🧪

Acid Base Calculator
Anion Gap Calculator
Arterial Blood pH Calculator
Bicarbonate Deficit Calculator
Corrected Calcium Calculator
Corrected Magnesium Calculator
Drip Rate Calculator
Drops Per Minute Calculator
Free Water Deficit Calculator
IV Flow Rate Calculator
Parkland Formula Calculator
Plasma Osmolality Calculator
Serum Osmolality Calculator
Sodium Change Calculator in Hypertriglyceridemia
Sodium Correction Calculator
Sodium Correction Rate Calculator for Hypo- and Hypernatremia
Sodium Deficit Calculator
Total Body Water Calculator
Urine Anion Gap Calculator
Venous Blood pH Calculator
Water Intake Calculator
Winters’ Formula

Hematology calculators 🆎

4T Score Calculator | HIT
Absolute Eosinophil Count Calculator
Absolute Lymphocyte Count Calculator
Absolute Reticulocyte Count Calculator
Age-Adjusted D-dimer Calculator
Albumin Globulin Ratio Calculator
ANC Calculator — Absolute Neutrophil Count
ANC Calculator without Bands
Blood Donation Due Date Calculator
Blood Donor Calculator
Allowable Blood Loss Calculator
Blood Type Calculator
Blood Volume Calculator
Corrected Reticulocyte Count Calculator
DIC Syndrome Calculator
Diffuse Large B-cell Lymphoma Prognosis Calculator
Fresh Frozen Plasma Dose Calculator
Hematocrit to Hemoglobin Ratio Calculator
INR Calculator
Iron Deficiency Calculator
Mentzer Index Calculator
MIPI Calculator (Mantle Cell Lymphoma International Prognostic Index)
mmol/L to mg/dL Calculator
NLR Calculator
Plasma Volume Calculator
RBC Indices Calculator | What is MCHC?
Transferrin Saturation Calculator

Percentile calculators 👶

Baby Percentile Calculator
Birth Weight Percentile Calculator
BMI Percentile Calculator
Height Percentile Calculator
Weight Percentile Calculator
Fetal Weight Percentile Calculator
Head Circumference Percentile Calculator
IQ Percentile Calculator

Pediatric calculators 🧒

Adjusted Age Calculator
APGAR Score Calculator
Baby Eye Color Calculator
Baby Formula Calculator
Baby’s Milk Intake Calculator
Exclusive Pumping Calculator
GIR calculator (Glucose Infusion Rate)
Height Calculator
Maintenance Fluids Calculator
Newborn Hyperbilirubinemia Assessment Calculator
PECARN Calculator
Pediatric Blood Pressure Calculator
Pediatric Blood Transfusion Volume Calculator
Pediatric Blood Volume Calculator
Pediatric GFR Calculator – Glomerular Filtration Rate

Pediatric dosage calculators 👶💊

Amoxicillin Pediatric Dosage Calculator
Ibuprofen Dosage Calculator
Infant Tylenol Dosage Calculator
Paracetamol Dosage Calculator
Pediatric Dose Calculator
Pediatric Epinephrine Dose Calculator

Dosage calculators 💊

Adderall Dosage Calculator
Aleve Dosage Calculator
Benadryl Dosage Calculator
Benzodiazepine Conversion Calculator
Carboplatin Calculator
Cefdinir Dose Calculator
Dosage Calculator
Drug Half-Life Calculator
Fish Oil Calculator
Gabapentin Dosage Calculator
Hydroxychloroquine Dose Calculator
Isotretinoin Dose Calculator
IVIG Dose Calculator
Levothyroxine Dosage Calculator
Lidocaine Dose Calculator
Local Anesthetic Calculator
mcg to IU Converter
Melatonin Dosage Calculator
MME Calculator
Opioid Conversion Calculator
Peptide Dosage Calculator
Prescription Refill Calculator
Steroid Conversion Calculator
tPA Calculator – Stroke Dosing
Tramadol Dosage Calculator
Tylenol Dosage Calculator
Tylenol Overdose Calculator
Warfarin Dosing Calculator

Pulmonary calculators 💨

Aa Gradient Calculator
BODE Index Calculator
CURB-65 Calculator
Dead Space Calculator
Endotracheal Tube Size Calculator
FEV1/FVC Ratio Calculator
Light’s Criteria Calculator for Pleural Effusion
Lung Cancer Risk Calculator
Lung Capacity Calculator
Lung Nodule Growth Rate Calculator
Mean Airway Pressure Calculator
Oxygenation Index Calculator
Peak Flow Calculator — Estimated Peak Expiratory Flow
PF Ratio Calculator
PSI Calculator
Qp/Qs Calculator
RSBI Calculator – Rapid Shallow Breathing Index
Tidal Volume Calculator
Vital Capacity Calculator

Psychiatry & psychology calculators 🧠

Depression Screening by PHQ-2 Calculator
EPDS Calculator
GAD-7 Calculator
Happiness Calculator
Snap Score Calculator

Intensive & emergency care calculators 🚑

Alvarado Score Calculator
APACHE II Calculator
GCS Calculator (Glasgow Coma Scale)
Injury Severity Score Calculator
ICH Score Calculator
LRINEC Score Calculator
MEWS Score Calculator
NEDOCS Calculator
NIH Stroke Scale
qSOFA Score Calculator
Revised Trauma Score
SAPS II Calculator: Simplified Acute Physiology II Score Calculator
SCORAD Calculator – SCORing Atopic Dermatitis
Sepsis Calculator (Sepsis-3 Criteria)
Shock Index Calculator
SOFA Score Calculator

Digestive system calculators 🍽️

APRI Calculator
Ast Alt Ratio Calculator
Child Pugh Calculator
CDAI calculator (Crohn’s Disease Activity Index)
Maddrey’s Discriminant Function Calculator
FIB-4 Calculator
Lille Score Calculator
MELD Calculator (Model for End-Stage Liver Disease)
NAFLD Fibrosis Score
(and other digestive/liver tools listed above)

Epidemiology calculators 👥

COVID-19 Mortality Risk Calculator
Event Risk Calculator – Coronavirus
Denver HIV Risk Score Calculator
Hand Sanitizer Calculator – Coronavirus
Incidence Rate Calculator
Infectious Disease and Epidemic Calculator (SIR Model)
Mask vs. No Mask Calculator
Max Vaccine Immunity Calculator
Mortality Rate Calculator
NNT Calculator
Reopening Calculator – Coronavirus
Social Distancing Calculator – Coronavirus
Coronavirus Protection – Swiss Cheese Model

Radiology calculators ☢️

BED Calculator
Medical Radiation Calculator
Radiation Dose Calculator
TI-RADS Calculator

Geriatric medicine calculators 👵

Alzheimer’s Life Expectancy Calculator
Barthel Index Calculator
BIMS Calculator – Brief Interview for Mental Status
Braden Score Calculator
Charlson Comorbidity Index Calculator
Frailty Index Calculator
Morse Fall Scale
Osteoporosis Risk Calculator
Tinetti Calculator

Covid-19 vaccine calculators 😷

Biden’s Vaccine Plan Calculator
Vaccine Efficacy Calculator
COVID-19 Vaccine Production Calculator
Vaccine Queue Calculator for Australia
Vaccine Queue Calculator for India
Vaccine Queue Calculator for Canada
Vaccine Queue Calculator for England
Vaccine Queue Calculator for Malaysia
Vaccine Queue Calculator for Ireland
Vaccine Queue Calculator for the Netherlands
Vaccine Queue Calculator for Northern Ireland
Vaccine Queue Calculator for the Philippines
Vaccine Queue Calculator for Scotland
Vaccine Queue Calculator for South Africa
Vaccine Queue Calculator for the UK
Vaccine Queue Calculator for Wales

Other calculators & niche tools

20/20 Vision Calculator for 2020
Aldrete Score Calculator
BASDAI Score Calculator
Beighton Score Calculator
Berg Balance Test Calculator
Hot Car Calculator
Centor Score Calculator (Modified/McIsaac)
Dog Walking Benefits Calculator
DASI Calculator (Duke Activity Status Index)
EASI Score Calculator
Fatigue Severity Scale Calculator
Free Testosterone Calculator — with Bioavailable Levels
Gut Microbiome Score Calculator
Noise Pollution Calculator – Maximal Exposure Time
Pokémon GO Weight Loss Calculator
Time Of Death Calculator

Start calculating — accurate, fast, and free

Every tool on this page is implemented with clear formulas and explanatory notes so you understand what is being calculated and why. Use our Health Calculators to analyze test results, estimate risk, check dosages, plan nutrition, or monitor fitness — all in seconds.