EBM Calculator

Built to support your appraisal of medical evidence—EBM Calculator is fast, clear, and easy to use.

Effect Calculator
• Used for studies that examine the effect of a therapy or exposure
• Calculate key measures for dichotomous outcomes:
◦ Absolute Risk Reduction (ARR)
◦ Number Needed to Treat (NNT)
◦ Risk Ratio (RR)
◦ Relative Risk Reduction (RRR)
◦ Odds Ratio (OR)
• Includes 95% Confidence Intervals for every metric

Diagnostic Test Calculator
• Used for studies that evaluate the accuracy of a diagnostic test
• Calculate core statistics:
◦ Sensitivity & Specificity
◦ Likelihood Ratios (LR+, LR–)
◦ Positive & Negative Predictive Values (PPV, NPV)
• Includes 95% Confidence Intervals for all measures

Post-Test Probability Calculator
• Used to estimate the likelihood of disease after a test result
• Input Sensitivity & Specificity or Likelihood Ratios
• Visualize probability changes with an interactive Fagan Nomogram

Save, Search & Share
• Save up to 100 results for future reference
• Search, sort, and filter results to quickly find what matters
• Share results as a PNG—ideal for Messages, email, and clean formatting
• Export results as an .ebmc file to archive or send to other EBM Calculator users
• Tap an .ebmc file to import results back into EBM Calculator

Lessons
• Explore lessons in Evidence-Based Medicine (EBM)
• Reinforce core concepts in biostatistics and study design

Have questions, feedback, or suggestions?
Reach out to support@ebmcalculator.com