All calculations must be re-checked by hand and should not be used alone to guide patient care. See disclaimer for more. Light green = required. Once required data is entered, click anywhere for results.

Equations

A-a O₂ Gradient
Abs Neutrophil Count
Abs Retic Count (Retic Index)
Age
Anion Gap (w/Delta Gap)
Basal Energy Expenditure
Bayes Sensitivty & Specificity
Bicarb Deficit
BMI/Surface Area
Calcium Correction in Hypoalbuminemia
Cockcroft-Gault GFR
Cardiac Output (Fick)
Corrected QT (QTc)
Corrected Sodium
CSF WBC Correction for RBCs
Endotracheal Tube Size for Children
FENa
LDL (Calculated)
Maddrey's Discriminant Function
Maintenance Fluids
MDRD GFR
Mean Arterial Pressure (MAP)
Oxygenation Index
Parkland Burns
Pedi Ins & Outs
Sodium Deficit
Serum Osmolality
Stool Osmolal Gap
Water Deficit
Winter's Formula

Scores

APGAR Score
Cardiac Risk (Framingham)
CHADS2 Score for Afib
PORT Score / CAP Risk
Glasgow Coma Score
MELD Score
Ranson's Pancreatitis Mortality
Strep Probability Score
TIMI Score for UA/NSTEMI
TIMI Score for STEMI
Well's Criteria for PE

Quick access to medical calculations.

MDCalc is quick access to all those medical calculations that are too painful to memorize, and too useful to ignore. After wasting time hunting through Google results to find the equations I needed, I created this site as a respository.

Start spending more time diagnosing, and less time dividing:

Start typing to search for the calculation you want
Select from the list to the left
Or use the dropdown boxes right above.

MDCalc has gone international!

After a number of emails, I finally found some time to update the site and make it possible to use the site for SI units--which everywhere but the US uses, I'm told.