Opioid Calculator Converter (MME Estimator)
Educational tool only. It estimates oral opioid conversion to Morphine Milligram Equivalents (MME/day) and an approximate equivalent oral dose.
What this opioid calculator converter does
This converter helps you estimate opioid potency using a common reference standard called Morphine Milligram Equivalents (MME). MME lets you compare different oral opioid doses on a single scale. For example, oxycodone and hydromorphone are more potent than morphine per milligram, while codeine and tramadol are less potent.
The main purpose of this tool is educational: it shows how a dose of one oral opioid maps to an approximate equivalent dose of another oral opioid based on published conversion factors.
How the conversion works
1) Convert your current opioid dose to MME/day
The formula is: MME/day = Current daily dose × Conversion factor.
2) Convert MME/day to a target opioid dose
Then: Estimated target daily dose = MME/day ÷ Target conversion factor.
3) Apply safety judgment
Even mathematically correct conversions may not be clinically appropriate. Individual tolerance, organ function, other medications, age, and diagnosis all matter. Many clinical workflows also reduce calculated equivalent doses when rotating opioids to account for incomplete cross-tolerance.
Conversion factors used in this page
| Opioid (oral) | MME Conversion Factor |
|---|---|
| Morphine | 1 |
| Oxycodone | 1.5 |
| Hydrocodone | 1 |
| Hydromorphone | 4 |
| Oxymorphone | 3 |
| Codeine | 0.15 |
| Tramadol | 0.1 |
| Tapentadol | 0.4 |
Important limitations
- This tool covers common oral opioids only.
- It does not include methadone, buprenorphine, or transdermal fentanyl due to more complex conversion behavior.
- It does not account for PRN patterns, formulation differences (IR vs ER), or patient-specific risk factors.
- It does not provide tapering or prescribing plans.
Best-practice use of opioid conversion tools
If you are a learner or clinician, think of this calculator as a first-pass estimate. Always verify against current institutional guidelines, drug labeling, and clinical references. If you are a patient or caregiver, use this page only for general understanding and discuss any medication changes with a licensed healthcare professional.
Opioid safety is especially important when doses increase, when sedating medications are combined, or when there is sleep apnea, lung disease, kidney/liver impairment, or prior overdose history.