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Centre for Evidence-
Based Medicine

EBM Calculators

These calculators were created for your own personal use and testing purposes. They are to be used as a guide only. Medical decisions should NOT be based solely on the results of these programs. Although this program has been tested thoroughly, the accuracy of the information cannot be guaranteed.

Statistics Calculator
Diagnostic Test - calculates the Sensitivity, Specificity, PPV, NPV, LR+, and LR-
Prospective Study - calculates the Relative Risk (RR), Absolute Relative Risk (ARR), and Number Needed to Treat (NNT)
Case-control Study - calculates the Odds Ratio (OR)
Randomized Control Trial (RCT) - calculates the Relative Risk Reduction (RRR), ARR, and NNT
Odds Ratio to NNT Converter
Conversion from OR to NNTs
Palm OS EBM Calculator
Downloadable version of the Stats Calculator and OR to NNT Converter for your Palm OS device.
Note: this is only for devices running Palm OS 3.1 or later. See Wikipedia for a list of Palm OS devices.
Pocket PC EBM Calculator
Downloadable version of the Stats Calculator for your Pocket PC device.
Note: this is only for devices running Pocket PC 2000 or later on devices with a Strong ARM processor. See Wikipedia for a list of Pocket PC devices.