Medical Calculators.
Clinical Grade. Free.
Cardiology risk scores, eGFR tools, ICU severity scores, pharmacology dose calculators, obstetrics tools and consumer health — all browser-based, zero signup, for educational & clinical reference.
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Cardiology
Risk scores, arrhythmia, lipids, anticoagulation
CHA₂DS₂-VASc Score
Stroke risk in non-valvular AF
HEART Score
Chest pain risk stratification
Framingham Risk Score
10-year cardiovascular disease risk
Mean Arterial Pressure
MAP from SBP and DBP
Cardiac Output (Fick)
CO from O₂ consumption and AV difference
TIMI Risk Score
STEMI & NSTEMI risk stratification
QTc Interval Calculator
Bazett & Fridericia correction
LDL Cholesterol Calculator
Friedewald equation
Warfarin Dose Estimator
CYP2C9/VKORC1 guided initial dose
HAS-BLED Bleeding Score
Bleeding risk in anticoagulated AF
Blood Pressure Classification
ACC/AHA 2017 BP categories
GRACE ACS Score
In-hospital & 6-month mortality in ACS
Nephrology
eGFR, CKD staging, drug dosing, dialysis
Creatinine Clearance (Cockcroft-Gault)
CrCl for drug dose adjustment
eGFR (CKD-EPI 2021)
Race-free eGFR & CKD staging
MDRD eGFR Calculator
4-variable MDRD formula
Urine Anion Gap
Differentiate metabolic acidosis cause
FENa / FEUrea Calculator
AKI pre-renal vs intrinsic
Dialysis Adequacy (Kt/V)
Single-pool Kt/V for HD
Calcium Correction
Correct calcium for albumin
Renal Drug Dose Adjuster
Dose % reduction by CrCl
Water Deficit (Hypernatremia)
Free water deficit & correction rate
Kidney Failure Risk Equation
2-year & 5-year ESKD risk
Emergency & ICU
Severity scores, fluid management, sepsis
CURB-65 Pneumonia Score
30-day mortality & admission decision
Glasgow Coma Scale
Consciousness level after brain injury
SOFA Sepsis Score
Sequential organ failure assessment
ABG Interpreter
Acid-base disorder classification
APACHE II Score
ICU mortality risk estimation
Anion Gap Calculator
Metabolic acidosis workup
Wells Score (DVT/PE)
Pre-test probability of DVT or PE
IV Fluid Rate Calculator
Holliday-Segar maintenance fluids
qSOFA Sepsis Screen
Quick SOFA at-risk detection
Burn Surface Area (Rule of 9s)
TBSA % for fluid resuscitation
PECARN Head Injury Tool
Pediatric CT decision rule
Neurology & Psychiatry
Stroke scales, mental health screening, cognitive tools
PHQ-9 Depression Screen
Patient Health Questionnaire severity
GAD-7 Anxiety Score
Generalized Anxiety Disorder scale
NIHSS Stroke Scale
NIH Stroke Scale severity score
Epworth Sleepiness Scale
Daytime sleepiness assessment
MMSE Cognitive Screen
Mini-Mental State Examination score
Lithium Dose Calculator
Target level-based dosing
AUDIT-C Alcohol Screening
Alcohol use disorder screening
CIWA-Ar Withdrawal Scale
Alcohol withdrawal severity
PTSD PCL-5 Checklist
PTSD symptom checklist (DSM-5)
Visual Acuity Converter
Snellen to LogMAR & decimal
Endocrinology
Diabetes, obesity, thyroid, steroid conversion
HbA1c ↔ Glucose Converter
eAG from HbA1c (Nathan equation)
BMI Calculator
WHO BMI with classification
Insulin Dose Calculator
Carb ratio & correction factor
BMR & TDEE Calculator
Mifflin-St Jeor caloric needs
FINDRISC Diabetes Risk
10-year T2DM risk score
Steroid Dose Converter
Equivalent doses between corticosteroids
Thyroid Function Interpreter
TSH/T4/T3 pattern interpretation
Ideal Body Weight
Devine formula for drug dosing
Body Fat % Calculator
US Navy & BMI methods
Carb & Glycemic Calculator
Glycemic load & glycemic index
Pharmacology
Weight-based dosing, TDM, antibiotics, opioids
Drug Interaction Checker
Major drug-drug interaction lookup
Weight-Based Drug Dose
mg/kg single & daily dose
Drug Half-Life Calculator
Time to reach steady state
Opioid Equianalgesic Converter
Morphine equivalent dose (OME)
Vancomycin Dosing
AUC-guided dosing & TDM
Aminoglycoside Dose
Extended-interval & traditional
IV Drip Rate (mcg/kg/min)
Vasopressor & inotrope drip rates
Pediatric Emergency Drugs
PALS resuscitation doses by weight
Pill Identifier Tool
Identify medications by imprint
Medication Cost Estimator
Monthly cost by drug & dose
Obstetrics & Gynaecology
Pregnancy dating, fetal growth, fertility, labour
Due Date (EDD) Calculator
Naegele's Rule from LMP
Gestational Age Calculator
GA from LMP or EDD
Fetal Weight Estimator
Hadlock formula from biometry
Pregnancy Weight Gain
IOM guidelines by BMI category
IVF Success Rate
CDC SART model live birth probability
Ovulation & Fertile Window
Peak fertility from cycle length
Bishop Score
Cervical ripeness for labour induction
Preeclampsia Risk
ACOG first-trimester risk model
PPH Oxytocin Calculator
Oxytocin dose for PPH management
APGAR Score
Newborn 1 & 5 minute assessment
Pulmonology
Spirometry, pneumonia severity, ABG, ARDS
Spirometry FEV1/FVC Interpreter
Obstructive vs restrictive pattern
PSI/PORT Pneumonia Score
Pneumonia Severity Index class
A-a Gradient
Alveolar-arterial oxygen difference
PaO2/FiO2 Ratio (ARDS)
Berlin definition ARDS severity
Peak Flow Calculator
Expected PEFR from age & height
Pack-Year Calculator
Smoking exposure for lung cancer screening
Gastroenterology
Liver disease severity, pancreatitis, ascites
MELD Score
End-stage liver disease severity
Child-Pugh Score
Chronic liver disease classification
SAAG Calculator
Serum-ascites albumin gradient
Ranson's Criteria
Acute pancreatitis severity
H. pylori Eradication Tracker
Treatment regimen dosing guide
Bowel Prep Dosing
Colonoscopy prep by weight & product
Oncology & Haematology
Chemo dosing, ANC, staging, transfusion
Chemotherapy Dose (BSA)
Mosteller BSA for chemo dosing
ANC Calculator
Neutropenia grading & nadir
PSA Velocity / Doubling Time
Prostate cancer surveillance tool
TNM Staging Interpreter
Overall stage from T, N, M inputs
INR / PT Ratio Converter
PT to INR & anticoagulation interpretation
IPSS-MDS Score
Myelodysplastic syndrome risk
Blood Transfusion Volume
pRBC volume for target Hb
Cancer Survival Probability
Stage-based 5-year survival estimate
Paediatrics
Growth charts, vaccines, neonatal tools
Child Growth Percentile
WHO & CDC growth chart percentile
Pediatric BMI-for-Age
BMI percentile for children 2–20
Fever Dose Calculator
Paracetamol & ibuprofen by weight
Holliday-Segar Fluid Calculator
Pediatric IV maintenance fluids
Vaccine Schedule Checker
CDC immunization schedule by age
Corrected Gestational Age
Adjusted age for premature infants
Pediatric ETT Size & Depth
Age-based tube size & insertion depth
Neonatal Jaundice (Bhutani)
Phototherapy threshold from bilirubin & hours
Consumer Health
Fitness, nutrition, insurance, surgery costs
BMI Health Calculator
BMI with health risk summary
Calorie Deficit Calculator
Weight loss target timeline
Heart Rate Zone Calculator
Training zones by age & max HR
Daily Water Intake
Hydration needs by weight & activity
Sleep Cycle Calculator
Optimal wake time from bedtime
Health Insurance Premium Estimator
ACA marketplace cost estimate
Blood Pressure Tracker
Log & classify BP readings
Cholesterol Ratio Calculator
TC/HDL & LDL/HDL cardiovascular risk
Surgery Cost Estimator
Procedure + hospital + anesthesia cost
Drug Rehab Cost Calculator
30/60/90 day program cost estimate
Therapy Session Cost Estimator
Psychotherapy cost by type & location
Medication Cost Comparator
Brand vs generic prescription prices
Why Clinicians & Patients Trust Our Free Medical Calculators
Our medical calculator suite is referenced to validated clinical guidelines including ACC/AHA, ACOG, IDSA, ADA, WHO, ASH, and AASLD. Each calculator shows the formula and primary reference so you can verify results. All tools run entirely in your browser — no data is transmitted.
From bedside ICU scoring to consumer wellness tracking, all 113 tools are free with no signup required. Results include clinical interpretation labels so you can act on the information immediately.
Specialties covered:
- ✓Cardiology: Framingham risk, CHA₂DS₂-VASc, TIMI, QTc, HAS-BLED
- ✓Nephrology: eGFR (CKD-EPI 2021), Cockcroft-Gault, MDRD, FENa, Kt/V
- ✓Emergency/ICU: GCS, SOFA, CURB-65, anion gap, Wells DVT/PE
- ✓Pharmacology: weight-based dosing, opioid equianalgesic, vancomycin
- ✓Obstetrics: due date, gestational age, Bishop score, IVF, APGAR
- ✓Consumer Health: BMI, calorie deficit, sleep cycles, surgery costs
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