Opioid Conversion Calculator
Opioid Conversion Factors (to MME)
| Opioid | Conversion Factor |
|---|---|
| Morphine (oral) | 1 |
| Hydrocodone | 1 |
| Oxycodone | 1.5 |
| Hydromorphone (oral) | 4 |
| Codeine | 0.15 |
| Fentanyl (mcg/hr patch) | 2.4 |
| Methadone (oral) | Variable* |
| Tramadol | 0.1 |
| Tapentadol | 0.4 |
*Methadone conversion is non-linear. This calculator uses 4 for <=20mg/day, 8 for 21-40mg/day, 10 for 41-60mg/day, 12 for >60mg/day.
Always use clinical judgment and consider cross-tolerance (reduce calculated dose by 25-50% for safety).
Always use clinical judgment and consider cross-tolerance (reduce calculated dose by 25-50% for safety).