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Calculate opioid doses with our online opioid conversion calculator. Convert opioid doses to MME with simple steps, clear results, and easy dose math.
| Opioid | Conversion Factor | Notes |
|---|---|---|
| Morphine (oral) | 1 | Reference opioid for MME |
| Hydrocodone (oral) | 1 | |
| Oxycodone (oral) | 1.5 | |
| Hydromorphone (oral) | 4 | |
| Oxymorphone (oral) | 3 | |
| Codeine (oral) | 0.15 | |
| Tramadol (oral) | 0.1 | |
| Tapentadol (oral) | 0.4 | |
| Methadone (oral) | 4 / 8 / 10 / 12 | Dose-dependent: ≤20mg/day=4, 21–40=8, 41–60=10, ≥61=12 |
| Fentanyl (transdermal) | 2.4 | Applied to mcg/hour, not mg/day |
An opioid conversion calculator can help check opioid dose math. It can show a dose as MME. MME means morphine milligram equivalent.
We made this calculator so users can check opioid math with ease. It can help with dose checks and dose review. But MME is a guide, not a new dose.
The main MME formula is:
MME per day = daily opioid dose × MME factor
The CDC lists these key factors. Hydrocodone is 1.0. Oxycodone is 1.5. Morphine is 1.0. Codeine is 0.15. Hydromorphone is 5.0. Methadone is 4.7. Tramadol is 0.2. Tapentadol is 0.4. Oxymorphone is 3.0. A fentanyl skin patch uses 2.4 per mcg/hour.
These factors are for pain care. They are not for opioid use disorder care.
A key point matters here. MME is not a direct swap dose. The CDC says these dose links are only estimates. A new opioid dose may need to be much lower. This is due to cross-tolerance and other drug and user factors. Methadone and fentanyl need extra care.
Say a user takes 20 mg of hydrocodone each day.
The CDC factor for hydrocodone is 1.0.
MME per day = 20 × 1.0
MME per day = 20 MME
So, 20 mg of hydrocodone each day is 20 MME with this factor. This does not mean 20 MME is the right dose of a new drug. A drug swap needs a full care check.
An opioid conversion calculator can make dose math fast and clear. It can help you check MME with less work. It should not take the place of a care team. Always check the drug label and care guide before a drug swap.
It is a tool that helps check opioid dose math. It can show a dose as MME.
For MME, take the daily dose and multiply it by the MME factor.
No. MME is an estimate for dose checks. It is not a direct new dose.
A skin patch uses mcg/hour. Most drugs in the CDC table use mg/day.
Methadone can stay in the body for a long time. Its risk can also last longer than its pain relief. So, a swap can be hard to judge.