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Evidence-Based Medicine: EBM Tools and Calculators

This is a libguide for praticing evidence-based medicine.

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EBM Calculators

EBM Calculators (Knowledge Translation Program, Toronto)

These calculators were developed by the Evidence-Based Centre in Toronto. They include calculators for statistics and Odds Ratio to NNT Converter. Links for Palm OS EBM Calculators and Pocket PC EBM calculators are also included.


CATMaker and EBM Calculators (Oxford Center for Evidence-Based Medicine)

CATMaker is a computer-assisted critical appraisal tool that helps you create Critically Appraised Topics (CATs) for the key articles you encounter about therapy, diagnosis, prognosis, etiology/harm and systematic reviews of therapy.


Evidence-Based Medicine Toolkit (University of Alberta)

This is a collection of tools for identifying, assessing and applying relevant evidence for better health care decision-making. The appraisal tools are adapted from the Users' Guides series prepared by the Evidence Based Medicine Working Group and originally published in JAMA.


Diagnostic Tests



Diagnostic Test Calculator (Alan Schwartz, University of Illinois at Chicago)

This calculator can help you determine various characteristics of diagnostic tests, such as sensitivity and specificity.


Bayesian Analysis Model (MEDCalc)

Calculates information (e.g. predictive value, likelihood ratio) about diagnostic tests.

Medical Calculators

UpToDate Calculators

UpToDate includes calculators to help you quickly and accurately calculate many different medical measurements in various specialties.



MedCalc 3000 is a computerized medical reference and tool set. MedCalc 3000 encompasses a wide array of pertinent medical formulae, clinical criteria sets and decision tree analysis tools used everyday by clinicians, medical educators, nurses and health care students. Also available as MedCalc 3000 mobile app.



Medcalc performs automatic computations of more than 300 hundred clinical formulas, equations and scores commonly used in medical practice. Also includes valuable point of care information.



A site for medical professionals to do calculations and process algorithms and scores.Calculators are listed by categories for specialty and system.