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Compute morphine milligram equivalents (MME/day), run opioid conversion between common agents (oxycodone, hydromorphone, fentanyl patch, buprenorphine, morphine), and map total exposure to overdose risk tiers. Pair with our pain scale calculator when documenting response. Educational— not for unsupervised prescribing; methadone and IV fentanyl need specialist protocols.
Last updated: June 5, 2026
This tool supports learning and self-audit. Opioid rotation, tapering, and high-MME management require licensed prescribers. Reduce calculated equivalents 25–50% for incomplete cross-tolerance. Call emergency services for suspected overdose.
Total MME
30 mg/day
Risk level
Low Risk
MME below 50 mg/day — lower population risk of overdose
Equivalent (morphine)
30.00 mg/day
Conversion breakdown
Reduce calculated equivalents 25–50% for incomplete cross-tolerance. Methadone and IV fentanyl need specialist protocols—not this table alone.
Oxycodone 10 mg BID → morphine
30 MME
Low Risk
Oxycodone 15 mg TID
67.5 MME
Moderate Risk
Fentanyl 25 mcg/hr patch
60 MME
≈ 60 mg/day morphine eq.
Hydromorphone 4 mg Q6H → oxycodone
64 MME
≈ 42.67 mg/day oxycodone
High-risk example: oxycodone 30 mg TID → 135 MME/day (High Risk)—naloxone and taper planning indicated per guidelines.
CDC opioid prescribing guideline teaching factors. Oral opioids use mg; patches use mcg/hr with ×24 adjustment.
| Opioid | MME factor | Unit | Notes |
|---|---|---|---|
| Morphine | 1.0 | mg | Baseline reference opioid |
| Oxycodone | 1.5 | mg | Common immediate-release and ER tablets |
| Hydrocodone | 1.0 | mg | Often combined with acetaminophen |
| Hydromorphone | 4.0 | mg | ~4× morphine potency orally |
| Oxymorphone | 3.0 | mg | High potency oral opioid |
| Codeine | 0.15 | mg | Prodrug—CYP2D6 variability |
| Tramadol | 0.1 | mg | Dual mechanism; seizure risk at high dose |
| Tapentadol | 0.4 | mg | Norepinephrine reuptake activity |
| Methadone | 0.2* | mg | Non-linear—factor varies by dose/duration; specialist only |
| Meperidine | 0.1 | mg | Short use; toxic metabolite with repeat dosing |
| Fentanyl patch | 0.1 | mcg/hr | MME = mcg/hr × 0.1 × 24 (transdermal) |
| Buprenorphine patch | 0.03 | mcg/hr | Partial agonist—conversion complex |
| Daily MME | Risk | Clinical action |
|---|---|---|
| <50 MME/day | Lower overdose risk | Monitor efficacy and side effects; consider non-opioid adjuncts |
| 50–89 MME/day | Moderate risk | Avoid dose escalation; reassess indication; pain specialist consult |
| 90–199 MME/day | High risk | Strongly consider taper; prescribe naloxone; frequent follow-up |
| ≥200 MME/day | Very high risk | Urgent dose reduction plan; addiction medicine referral |
| Rule | Detail |
|---|---|
| Reduce 25–50% for cross-tolerance | Start below calculated equivalent when rotating opioids—titrate to effect |
| Methadone non-linear | Never use simple factor tables for methadone—specialist conversion charts required |
| IV vs transdermal fentanyl | This tool models transdermal mcg/hr; IV fentanyl needs separate protocol |
| Buprenorphine partial agonist | Switching to/from buprenorphine risks precipitated withdrawal—protocol-driven |
| Add multi-opioid MME | Sum MME from all concurrent opioid sources for total daily exposure |
Daily dose (oral) = dose per dose × frequency per dayMME (oral) = daily dose (mg) × conversion factorMME (patch) = mcg/hr × factor × 24 hoursTarget equivalent = total MME ÷ target factor (÷ 24 for patch targets)Sum MME from all concurrent opioids. When rotating, start at 50–75% of the calculated target and titrate.
| Approach | When to consider |
|---|---|
| 10% per week | Typical outpatient taper when stable |
| 25% per week | Faster taper if intolerable side effects at high MME |
| Pause at each step | Hold 1–2 weeks if withdrawal or pain flare |
| Adjunct non-opioids | NSAIDs, gabapentinoids, PT, behavioral pain strategies |
Result: 30 MME/day (Low Risk) — ≈ 30 mg/day morphine; cross-tolerance start ~22.5 mg/day
Result: 60 MME/day (Moderate Risk) — oral morphine equivalent ≈ 60 mg/day before cross-tolerance reduction
At ≥90 MME/day, guidelines emphasize naloxone co-prescribing, PDMP checks, and structured taper rather than dose escalation.
Educational use only. This calculator does not store PHI, does not transmit orders to pharmacies, and cannot account for every patient-specific factor. For pain flares during taper, contact your prescriber rather than self-escalating opioids. In overdose emergency, call local emergency number and administer naloxone if available.
Help colleagues and patients understand morphine equivalents and conversion safety
Suggested hashtags: #MMECalculator #OpioidSafety #PainManagement #MedicalCalculator