# Opioids Dosage Conversion

> Opioid analgesic dosage conversion calculator for medical professionals. (iPhone/iPad app by Chris Marcellino MD LLC.)

- Source: https://appshunter.io/ios/app/opioids-dosage-conversion/id382383903 (this page in markdown: same URL + `.md`)
- Developer: [Chris Marcellino MD LLC](https://appshunter.io/developer/1161719220)
- Category: Medical, Health & Fitness
- Price: Free
- Rating: 4.28/5 from 18 App Store ratings · 44 written reviews indexed
- Age rating: 17+
- Requires: iOS 15.6 · 2 MB
- Languages: English
- Released: 2010-07-30
- Data updated: 2026-08-16
- Monetization: free
- User reviews in markdown: https://appshunter.io/ios/app/opioids-dosage-conversion/id382383903/reviews.md

## What is Opioids Dosage Conversion?

Opioids by Chris Marcellino MD and Norris Vivatrat MD is an opioid analgesic dosage conversion calculator for use by trained medical professionals. The application supports conversion to and from opioids commonly prescribed and used in U.S. hospitals orally, parenterally, or transdermally, including morphine, codeine, hydromorphone, hydrocodone, fentanyl, methadone, oxycodone and oxymorphone.  The application is intended to help and instruct in the process of conversion of opioid regimens.

    • Native support for iPhone, iPad and iPod touch
    • Multiple route support
    • Multiple drug support
    • Incomplete cross tolerance option
    • Breakthrough dosing calculator
    • Provides instructional details about each calculation
    • Saves last calculation on exit
    • Supports landscape and portrait modes
    • Reference guide

By Professor EBM, the Internal Medicine Residency Teaching Resource for Evidence-Based Medicine: http://www.professorebm.com/, a resource of the Santa Clara Valley Medical Center.

While effort has been made to ensure that calculations are accurate and that conversion factors are in accordance with current accepted medical practices, use of this application is entirely at your own risk. This application should only be used by trained medical professionals and all results should be double checked by hand. Use of the app requires acceptance of the terms of use that are included with the application. 

Please send support requests and feedback using the link in the About tab of the app, though as a free academic tool we only have limited resources to address new feature requests.

Opioid equipotency data is taken from CAPC conversion values except where noted (see the reference tab in the app.) CAPC values are as published in the Center to Advance Palliative Care Prescribing Opioids: A Reference Guide curriculum, which are adapted from McPherson ML. Demystifying Opioid Conversion Calculations: A Guide for Effective Dosing, 2nd ed. American Society of Health-System Pharmacists, Bethesda, Maryland, 2018. EPEC values are as published in EPEC-O Participants Handbook, 2005.

Chris Marcellino, MD — Mayo Clinic
Norris Vivatrat, MD — UCSD Medical Center

Special thanks to Dr. Tom Mouser (EveryStep, Des Moines, IA) and Dr. David Rand (UVM Medical Center).

## Key features

- Opioid dosage conversion
- Multiple drug support
- Multiple route support
- Breakthrough dosing calculator
- Incomplete cross tolerance option
- Instructional details

## Recent user reviews (10 of 44)

All indexed reviews: https://appshunter.io/ios/app/opioids-dosage-conversion/id382383903/reviews.md

### 5/5 — EBM converter

*2025-09-02, version 3.0.2*

I use this app daily in my practice and regularly give it to learners. Great app!

### 5/5 — Needs IV option for fentanyl

*2023-07-14, version 3.0*

Otherwise excellent app! Recommended throughout anesthesia and palliative departments

### 1/5 — Needs better interface

*2022-07-26, version 2.0*

Very cumbersome, and needs better user interface. Needs update.

### 1/5 — Incomplete

*2018-11-01, version 1.8*

Does not include Tapentadol or many other opioids.  Only dosing options are q6h, q8h and w24h.

### 4/5 — It works

*2015-11-29, version 1.8*

This app appears to work well. You can choose from 2 different calculation algorithms with lettered abbreviations, but there is no explanation how to choose.  prn doses require a frequency input before allowing you to enter the actual number of doses given and this is unnecessary. Looks good though and appears to work.

### 5/5 — You are the best tool I found after looking for so long... Thank you !!!

*2015-04-03, version 1.8*

Thanks!!!!!!

### 5/5 — Great tool

*2014-12-06, version 1.8*

Use it all the time. It is quick and efficient!

### 4/5 — Pretty good opioid calculator

*2014-10-26, version 1.8*

When I upgraded my iPhone to iOS 8, I lost the ability to use my original opioid calculator app, the opioid. This is a fairly suitable replacement, and it works well with good stability on my iPhone 5S running iOS 8. The only suggestion I would have is that it is cumbersome to enter in numerical quantities for milligrams received using "rollers" instead of a keypad.

### 5/5 — Great app!!

*2014-10-12, version 1.8*

I use it everyday working in pain management! The only improvements you could make is add Nucynta and a two a day dose for Fentanyl Patch!!

### 5/5 — Allows conversion for patients on multiple meds

*2014-06-04, version 1.7*

Allows for the entry of multiple opioids that can merge into a single conversion recommendation. Well annotated. Other apps I have used required the use of scratch paper to write down intermediate results. Not this one! Thanks for making conversions for my patients faster and safer.

## Frequently asked questions about Opioids Dosage Conversion

### What does the Opioids Dosage Conversion app do?

This application serves as an opioid analgesic dosage conversion calculator designed for use by trained medical professionals. It facilitates conversions to and from commonly prescribed opioids across oral, parenteral, and transdermal routes.

### What are the key features of this opioid calculator?

Key features include support for multiple opioid drugs and administration routes, an incomplete cross-tolerance option, a breakthrough dosing calculator, and instructional details for each calculation. It also saves the last calculation and functions in both landscape and portrait modes.

### Is this app free to use?

Yes, the application is described as a free academic tool. While efforts are made to ensure accuracy, users are advised that use is at their own risk and results should be double-checked.

### Who is this app intended for?

The application is strictly intended for use by trained medical professionals. It is designed to assist and instruct in the process of converting opioid regimens for patient care.

### What opioid drugs and routes are supported?

The app supports conversion to and from opioids commonly prescribed in U.S. hospitals, including morphine, codeine, hydromorphone, hydrocodone, fentanyl, methadone, oxycodone, and oxymorphone. It supports oral, parenteral, and transdermal routes of administration.

## Version history (last 5 releases)

### 3.0.3 — 2025-10-09

Improve reference view on recent iOS versions

### 3.0.2 — 2023-08-02

Use traditional conversion (1:2) for fentanyl based on clinical experience and increased safety (regardless of incomplete cross tolerance) when transitioning to oral opioids from transdermal fentanyl. 

Also, includes all updates in the 3.0 version: 
Changed opioid equipotency calculations to use CAPC conversion tables (which are adapted from McPherson's Demystifying Opioid Conversion Calculations...).
Simplify methadone conversion tables and remove outdated "Rule of 15" usage. Added new guidance comments for methadone initiation. 
Updated reference tab documentation.

### 3.0.1 — 2023-07-14

Added new guidance comments for methadone initiation. 
Also, includes all updates in the 3.0 version: 
Changed opioid equipotency calculations to use CAPC conversion tables (which are adapted from McPherson's Demystifying Opioid Conversion Calculations...).
Simplify methadone conversion tables and remove outdated "Rule of 15" usage. 
Updated reference tab documentation.

### 3.0 — 2023-06-29

Changed opioid equipotency calculations to use CAPC conversion tables (which are adapted from McPherson's Demystifying Opioid Conversion Calculations...).
Simplify methadone conversion tables and remove outdated "Rule of 15" usage. 
Updated reference tab documentation. 
Reliability improvements.

### 2.0 — 2020-12-19

Dark Mode support on iOS 13 and later.
(no changes to drug algorithms or function)

## Apps similar to Opioids Dosage Conversion

| App | Rating | Price | Category |
| --- | --- | --- | --- |
| [MKSAP 19](https://appshunter.io/ios/app/mksap-19/id1577787036) | 4.1 (34) | Free | Medical |
| [MyABFM](https://appshunter.io/ios/app/myabfm/id6479449824) | 2.5 (22) | Free | Medical |
| [Contraception Point-of-Care](https://appshunter.io/ios/app/contraception-point-of-care/id1212014869) | 5.0 (18) | Free | Medical |
| [ASCCP Management Guidelines](https://appshunter.io/ios/app/asccp-management-guidelines/id1498550832) | 4.8 (8,537) | $14.99 | Medical |
| [Waco Guide- Psychopharmacology](https://appshunter.io/ios/app/waco-guide-psychopharmacology/id1503707099) | 4.9 (1,025) | Free | Medical |
| [ASRA Coags](https://appshunter.io/ios/app/asra-coags/id858796572) | 1.3 (407) | Free | Medical |

## More apps by Chris Marcellino MD LLC

- [VisitCoding](https://appshunter.io/ios/app/visitcoding/id819787890)

All apps by Chris Marcellino MD LLC: https://appshunter.io/developer/1161719220

## Related topics

[opioid conversion calculator](https://appshunter.io/ios/topics/opioid-conversion-calculator) · [opioid](https://appshunter.io/ios/topics/opioid) · [opioid conversion](https://appshunter.io/ios/topics/opioid-conversion) · [opioid calculator](https://appshunter.io/ios/topics/opioid-calculator) · [cdc opioid](https://appshunter.io/ios/topics/cdc-opioid) · [opioid tool](https://appshunter.io/ios/topics/opioid-tool) · [my opioid manager](https://appshunter.io/ios/topics/my-opioid-manager) · [fentan](https://appshunter.io/ios/topics/fentan) · [buprenorphine home induction](https://appshunter.io/ios/topics/buprenorphine-home-induction)

---

*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 2026-08-16.*