Medical Calculators

Browse free medical calculators — online medical calculator tools for BMI, body surface area, eGFR, creatinine clearance, clinical risk scores and unit conversions. Built for doctors, nurses, students and patients. Save results in a health log and keep longer records in the medical history tracker.

49 medical calculators available

ABCD² Score for TIA

Estimates the risk of stroke after a suspected transient ischemic attack (TIA).
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Absolute Neutrophil Count (ANC)

Frequently used to assess neutropenic fever in chemotherapy patients.
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Altitude-Adjusted PERC Rule

Rules out PE if no criteria are present; includes SaO₂ adjustment for altitude.
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Alvarado Score for Acute Appendicitis

Predicts likelihood of appendicitis diagnosis.
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Anion Gap

Assesses metabolic acidosis etiology
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APACHE II Score

Estimates ICU mortality using the Acute Physiology and Chronic Health Evaluation II score.
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Bicarbonate Deficit

Calculates the total body bicarbonate deficit.
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BISAP Score for Pancreatitis Mortality

Predicts mortality risk in pancreatitis with fewer variables than Ranson's.
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Bishop Score for Vaginal Delivery and Induction of Labor

Predicts likelihood of successful vaginal delivery.
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BMI Calculator

Calculate Body Mass Index from height and weight
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Centor Score (Modified/McIsaac) for Strep Pharyngitis

Estimates probability that pharyngitis is streptococcal, and suggests management course.
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CHA2DS2-VASc Score

Predicts stroke risk in atrial fibrillation patients
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Child-Pugh Score

Assesses severity of liver cirrhosis
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Corrected Calcium

Correction for albumin level effects on calcium
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Corrected QT Interval (QTc)

Corrects the QT interval for heart rate extremes (choose from Bazett, Fridericia, Framingham, Hodges, or Rautaharju formulas).
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Corrected Reticulocyte Percentage/Reticulocyte Production Index (RPI)

Evaluates bone marrow response to anemia, often in sickle cell patients.
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Creatinine Clearance (Cockcroft-Gault)

Calculates CrCl according to the Cockcroft-Gault equation.
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Duke Activity Status Index (DASI)

Estimates functional capacity.
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Duke Treadmill Score

Diagnoses and prognoses suspected CAD based on the treadmill exercise test.
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Fat Free Mass (FFM)

Calculates the predictive value of fat free mass from body weight and body mass index (BMI).
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FeverPAIN Score for Strep Pharyngitis

Predicts likelihood of strep throat.
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FIB-4 Index

Fibrosis-4 index predicts liver fibrosis
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Free Water Deficit in Hypernatremia

Calculates free water deficit by estimated total body water in a patient with hypernatremia or dehydration.
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Glasgow Coma Scale (GCS)

Coma severity based on Eye (4), Verbal (5), and Motor (6) criteria.
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Glasgow Coma Scale (GCS)

Coma severity based on Eye (4), Verbal (5), and Motor (6) criteria.
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HAS-BLED Score

Assesses bleeding risk in anticoagulated patients
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HEART Score

Risk stratification for acute coronary syndrome
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HEMORR₂HAGES Score for Major Bleeding Risk

Quantifies risk of hemorrhage in elderly patients with AFib.
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Ideal Body Weight and Adjusted Body Weight

Calculates ideal body weight (Devine formula) and adjusted body weight.
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IV Drip Rate Calculator

Calculates IV infusion rate using drip counting when IV pumps are unavailable.
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Maintenance Fluids Calculations

Calculates maintenance fluid requirements by weight.
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Mean Arterial Pressure (MAP)

Calculates mean arterial pressure.
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MELD Score (Original, Pre-2016, Model for End-Stage Liver Disease)

Quantifies end-stage liver disease for transplant planning.
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National Early Warning Score (NEWS) 2

Determines the degree of illness of a patient and prompts critical care intervention (NHS).
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Pack Years Calculator

Calculates pack years in patients with any smoking history.
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Parkland Formula for Burns

Calculates fluid requirements for burn patients in a 24-hour period.
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PHQ-9 (Patient Health Questionnaire-9)

Objectifies degree of depression severity.
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Pulmonary Embolism Severity Index (PESI)

Predicts 30-day outcome of patients with pulmonary embolism.
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qSOFA Score

Predicts sepsis mortality in ICU patients
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RIPASA Score for Acute Appendicitis

Diagnoses appendicitis with lab values and clinical findings, especially for Asian populations.
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Sequential Organ Failure Assessment (SOFA) Score

Predicts ICU mortality based on lab results and clinical data.
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Serum Osmolality/Osmolarity

Calculates expected serum osmolarity, for comparison to measured osmolality to detect unmeasured compounds in the serum.
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Sodium Correction for Hyperglycemia

Calculates the actual sodium level in patients with hyperglycemia.
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Sodium Deficit in Hyponatremia

Calculates sodium quantity missing in hyponatremia.
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Steroid Conversion Calculator

Converts steroid dosages using dosing equivalencies.
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Surgical Apgar Score (SAS) for Postoperative Risk

Predicts postoperative risk of major complication, including death.
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TIMI Risk Score

Predicts death or myocardial infarction risk
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Wells' Criteria for DVT

Calculates risk of deep vein thrombosis (DVT) based on clinical criteria.
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Wells' Criteria for Pulmonary Embolism

Determines pretest probability of pulmonary embolism (PE) based on clinical criteria.
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Medical calculators — FAQs

What are medical calculators?

Medical calculators are online clinical tools that run formulas such as BMI, body surface area, eGFR, creatinine clearance and risk scores. MedXSmart medical calculators show the inputs, the result and the supporting references so clinicians, students and patients can check the working.

Are MedXSmart medical calculators free?

Yes. You can use the medical calculators on MedXSmart without paying. Create a free account if you want to save favourites, keep a health log of results, or track medical histories alongside the calculations.

Who should use these medical calculator tools?

Doctors, nurses, medical students and patients use these medical calculators for education and decision support. They are not a substitute for clinical judgement — always confirm results with a qualified clinician.

How do medical calculators work with health logs?

After you run a medical calculator, you can record related numbers in a health log (for example weight, blood pressure or glucose) and keep the longer medical history in the medical history tracker.

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