# EBM Stats Calc — calculate basic EBM stats

> Medical app for calculating EBM statistics like NNT, sensitivity, specificity, and predictive values. (iPhone/iPad app by Joshua D. steinberg.)

- Source: https://appshunter.io/ios/app/ebm-stats-calc/id1329546106 (this page in markdown: same URL + `.md`)
- Developer: [Joshua D. steinberg](https://appshunter.io/developer/374154837)
- Category: Medical
- Price: Free
- Rating: 4.50/5 from 2 App Store ratings · 2 written reviews indexed
- Age rating: 12+
- Requires: iOS 13.0 · 1 MB
- Languages: American English
- Released: 2018-01-04
- Data updated: 2026-06-01
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/ebm-stats-calc/id1329546106/reviews.md

## What is EBM Stats Calc?

Occasionally in medicine, we really need to "do the math".  This app will help.  EBM Stats Calc let's a clinician do calculations that are hard or impossible to do in one's head.  A clinician can get NNT's (number needed to treat) from rates, percentages, or raw event and patient numbers.  And a clinician can use sensitivity and specificity or likelihood ratios (LR+, LR-) to go from a pretest probability to posttest probability and positive predictive value and negative predictive value.

Although these calculators themselves are somewhat novel for apps, the unique tool in this app is for educators.  Students and residents have a hard time understanding how the utility of a test can vary with pretest probability.  Instead of saying it in words and hoping they get it, now you can demonstrate it.  A test might perform well, giving good PPV and NPV, when pretest probability is in a certain range.  But slide that pretest probability up or down and see the diagnostic utility change with the numbers flying right before your eyes.  The tool also shows a student that in many cases, an imprecise estimate of pretest probability doesn't much matter.  Different doctors might judge a clinical case to suggest likelihood of disease (pretest probability) of 40%, 50%, or 60%.  The slider tool shows that the differences may not matter, and the test in mind will render good clarity regardless of differing opinions on pretest probability.

The app is written for clinicians, students, residents, and especially educators, in any discipline of medicine.  As a clinician and educator myself, I would be grateful for feedback to make the tool better.

## Key features

- Calculate Number Needed to Treat (NNT)
- Calculate diagnostic test utility
- Pretest to posttest probability conversion
- Positive and Negative Predictive Value calculation
- Interactive slider for pretest probability demonstration
- Useful for clinicians, students, residents, and educators

## Recent user reviews (2 of 2)

All indexed reviews: https://appshunter.io/ios/app/ebm-stats-calc/id1329546106/reviews.md

### 5/5 — Get rid of all your other Apps!!

*2020-04-23*

This app is your conduit to THE TRUTH! Use it before you order any test and you'll be a much better clinician.

### 4/5 — Great app

*2018-09-07*

Love this app but would be a 5/5 if it had a standard 2x2 calculator where you enter each of the four squares and get Sn/Sp/PPV/NPV.

## Frequently asked questions about EBM Stats Calc

### What is EBM Stats Calc used for?

EBM Stats Calc is a medical application designed to help clinicians and educators perform complex calculations related to evidence-based medicine. It aids in determining metrics like Number Needed to Treat (NNT), sensitivity, specificity, and predictive values.

### Who is the target audience for EBM Stats Calc?

The app is intended for a broad medical audience, including practicing clinicians, medical students, residents, and educators across all medical disciplines who require statistical calculations for their work or teaching.

### Does EBM Stats Calc have ads?

No, EBM Stats Calc does not contain advertisements. It is a free application designed to provide a clean and focused user experience for medical calculations.

### What devices is EBM Stats Calc available on?

EBM Stats Calc is available for iPhone, iPad, and iPod devices. It is designed to run on iOS operating systems.

### How often is EBM Stats Calc updated?

The latest version of EBM Stats Calc is 1.2, which was last updated on May 10, 2020. Users can expect updates to improve functionality and address any issues.

### What is the age rating for EBM Stats Calc?

EBM Stats Calc has an age rating of 12+. This indicates it is suitable for users aged 12 and above, generally due to the nature of medical terminology and concepts.

### What are the key features of EBM Stats Calc?

Key features include calculating NNT from various inputs, converting pretest probability to posttest probability, and demonstrating the impact of pretest probability on diagnostic test utility using an interactive slider.

### What is the user rating for EBM Stats Calc?

EBM Stats Calc has a high user rating of 4.5 stars, based on 2 ratings. This suggests a positive reception from its user base.

## Version history (last 3 releases)

### 1.2 — 2020-05-10

updates links, updated for compatibility with latest iOS programming standards

### 1.1 — 2018-01-22

- reworked the layout to support iPhone X properly
- all other iPhones and iPads should see no evident changes
- but if something ain't quite right, do please let me know!

### 1.0 — 2018-01-04

No release notes.

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## More apps by Joshua D. steinberg

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All apps by Joshua D. steinberg: https://appshunter.io/developer/374154837

## Related topics

[ebm stats calc](https://appshunter.io/ios/topics/ebm-stats-calc) · [sensitivity specificity](https://appshunter.io/ios/topics/sensitivity-specificity) · [nnt](https://appshunter.io/ios/topics/nnt) · [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 2026-06-01.*