# EBM Calculator — Interpret study results fast

> Medical evidence appraisal tool for interpreting study results and biostatistics. (iPhone/iPad app by David Stewart.)

- Source: https://appshunter.io/ios/app/ebm-calculator/id6737999201 (this page in markdown: same URL + `.md`)
- Developer: [David Stewart](https://appshunter.io/developer/1778788927)
- Category: Medical, Education
- Price: Free
- Rating: 5.00/5 from 3 App Store ratings
- Age rating: 4+
- Requires: iOS 18.1 · 14 MB
- Languages: English
- Released: 2025-04-23
- Data updated: 2026-06-11
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/ebm-calculator/id6737999201/reviews.md

## What is EBM Calculator?

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

Effect Size 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 unlimited 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
 • Search lessons by title or keyword

Guided Tutorials
   • Step-by-step tutorials walk you through every major feature
   • Access from the menu in each view or from Settings

iCloud Sync
   • Saved results sync automatically across all your devices

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

## Key features

- Effect Size Calculator
- Diagnostic Test Accuracy Calculator
- Post-Test Probability Calculator
- Fagan Nomogram visualization
- Save, Search, and Share results
- Evidence-Based Medicine lessons
- iCloud Sync


## Frequently asked questions about EBM Calculator

### What is EBM Calculator used for?

EBM Calculator is designed to help users rapidly appraise medical evidence. It provides tools for calculating effect sizes, diagnostic test accuracy, and post-test probabilities, along with educational content on Evidence-Based Medicine.

### What types of calculations does EBM Calculator offer?

EBM Calculator includes an Effect Size Calculator for dichotomous outcomes (ARR, NNT, RR, RRR, OR) and a Diagnostic Test Calculator for sensitivity, specificity, likelihood ratios, and predictive values. It also features a Post-Test Probability Calculator with a Fagan Nomogram.

### Can I save and share my calculations with EBM Calculator?

Yes, you can save unlimited results for future reference, search, sort, and filter them. Results can be shared as PNG images or exported as .ebmc files for archiving or sharing with other users.

### Does EBM Calculator have ads?

No, EBM Calculator does not contain advertisements. It is a completely ad-free application, allowing for an uninterrupted user experience.

### What devices is EBM Calculator available on?

EBM Calculator is available on iPhone and iPad devices, ensuring compatibility for a wide range of Apple users.

### How often is EBM Calculator updated?

The latest version of EBM Calculator is 1.6.0, and it was last updated on May 1, 2026. This indicates a recent update, suggesting ongoing development and support.

### What is the user rating for EBM Calculator?

EBM Calculator has an excellent rating of 5.0 stars based on 3 user reviews. This high rating suggests a very positive user experience and satisfaction with the app's functionality.

### Does EBM Calculator offer lessons on Evidence-Based Medicine?

Yes, EBM Calculator includes lessons on Evidence-Based Medicine (EBM) to help users reinforce core concepts in biostatistics and study design. These lessons can be searched by title or keyword.

## Version history (last 5 releases)

### 1.6.0 — 2026-05-01

Big update: iPad layout, iCloud sync, in-app tutorials, and more!

   • Full iPad layout with adaptive spacing and split-view support
   • Results now sync across all your devices through iCloud
   • In-app guided tutorials; access from the menu in each view or from Settings
   • In-app FAQ in Settings
   • New Settings menu
   • Manual import option in menu
   • "Update Saved Result" option when editing a previously saved result
   • Date Modified sort option in Saved Results
   • Reorganized menus across all views for consistency
   • Behind-the-scenes storage migration for iCloud sync
   • Performance enhancements and bug fixes

### 1.5.1 — 2025-12-18

Bug fixes and minor improvements

### 1.5.0 — 2025-12-15

What's New – v1.5.0
•  Clearly labeled input fields across all calculators
•  A significantly improved Results tab with sorting, filtering, and compact views
•  Share results as PNGs, or export .ebmc archives (single or batch)
•  Smoother navigation when editing and saving results
•  Updated UI with iOS 26 Liquid Glass design elements
•  Performance enhancements and bug fixes

### 1.4.0 — 2025-05-20

Exciting news — citations are now supported in all calculators! Here's what's new in this update:

•  Citations now supported in all calculators
    ◦  Enter a PMID to automatically fetch the full citation
    ◦  Or manually enter your own citation
    ◦  Tap to view, copy, or open the citation in PubMed
    ◦  Citations are searchable within saved results
•  Improved Case-Control inputs
    ◦  Redesigned for better clarity and ease of use (thanks Dr. Kurlander for the helpful feedback!)
•  You can now save up to 100 results
•  Results are now better formatted when printed, emailed, or shared via messages
•  Bug fixes and UI polish

### 1.3.0 — 2025-04-23

No release notes.

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## Related topics

[ebm](https://appshunter.io/ios/topics/ebm)

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*Data collected daily from the US App Store and indexed by [AppsHunter](https://appshunter.io/). User reviews are verbatim App Store reviews. Ratings, prices and chart positions refresh continuously; this snapshot is from 2026-06-11.*