# Opioid MME (Morphine Milligram Equivalent) Calculator
> Free opioid MME calculator using the CDC 2022 opioid guideline conversion factors. Supports oral morphine, oxycodone, hydrocodone, hydromorphone, codeine, tramadol, oxymorphone, tapentadol, methadone, and fentanyl transdermal.

## Overview

Morphine milligram equivalents (MME) is a standardised conversion framework used to summate daily opioid burden across multiple agents. The CDC 2022 Clinical Practice Guideline for Prescribing Opioids retained MME as a tool for clinical safety review while explicitly cautioning against its use as a hard prescribing threshold. This calculator implements the CDC 2022 conversion factors for the most commonly prescribed oral opioids plus the standard fentanyl transdermal conversion (mcg/hr × 2.4 = MME/day). Methadone is dose-tiered per the CDC 2022 guideline because of its non-linear potency profile.

## Who this is for

- Primary care, palliative care, and pain medicine clinicians
- Hospitalists managing opioid stewardship
- Pharmacists performing prescribing safety reviews

## How to interpret the result

| Score / band | Meaning |
|---|---|
| < 50 MME/day | Below the CDC 2022 threshold for additional caution. |
| ≥ 50 MME/day | CDC 2022 recommends additional risk-benefit review. |
| ≥ 90 MME/day | CDC 2022 recommends careful justification and monitoring; avoid escalation when feasible. |

## Cited source

**CDC Clinical Practice Guideline for Prescribing Opioids for Pain (2022)** (2022) — U.S. Centers for Disease Control and Prevention

_Primary publication:_ Dowell D et al., MMWR 2022

## FAQs

### Are MMEs a hard prescribing threshold?

No. The CDC 2022 guideline explicitly emphasised that MMEs are decision-support, not a regulatory cap. Patients on stable, effective regimens should not be tapered solely because of MME.

### Why is methadone tiered?

Methadone has non-linear potency that increases with daily dose due to NMDA antagonism and prolonged tissue accumulation. The CDC 2022 guideline retained the dose-tiered conversion factors.

### How do I convert fentanyl patches?

Standard CDC convention: fentanyl mcg/hr × 2.4 = oral morphine MME/day. A 25 mcg/hr patch ≈ 60 MME/day.

### Are tramadol and tapentadol included?

Yes. Tramadol uses a 0.1 conversion (oral); tapentadol uses 0.4 (oral). Both are atypical opioids; treat MME conservatively.

### Does this calculator address chronic vs acute pain?

MME applies to total daily opioid burden regardless of indication. Use clinical judgement to interpret in chronic vs acute contexts.

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_Rounds AI is a citation-first clinical AI assistant. It supports clinical reasoning by surfacing cited information and is not a substitute for independent clinical judgement._