NoteA guide only. Response to different opioids varies. Reassess closely after switching and adjust the dose. Methadone conversion is not included; restrict it to specialists. Fentanyl patch uses a factor of 3.6 (12 µg/h ≈ 43 mg oral morphine/24 h, the upper part of the guide’s 30–45 mg range); sublingual buprenorphine (8–16 mg) uses the mid-point.
SourceConversion values are taken from the WA Department of Health Opioid Conversion Guide (OCM-14654, April 2026). The 25% cross-tolerance reduction is common practice and is not part of that guide. This is an independent tool, not published, affiliated with or endorsed by the Department.
Values in purple are calculated v1.5