An official website of the State of Oregon
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* Conversion functions derived from https://amdg.wa.gov/calculator/DoseCalculator.
Please refer to the Short-Term and Long-term Opioid Practice Tips published by Oregon Workers' Compensation Division.
Caution: This calculator is for informational purposes only and should not be used to determine daily doses when switching a patient from one opioid to another or changing the route of administration, e.g., from IV to orally. This is especially important when switching a patient to or from fentanyl. Equianalgesic daily doses displayed are only approximations and do not account for genetic factors, incomplete cross-tolerance, and pharmacokinetics.
There are special considerations for calculating Methadone (Methadose, Dolophine) MED. This calculator uses the following conversion factors: for up to 20 mg of Methadone per day the conversion factor is 4, for 21-40 mg per day the conversion factor is 8, for 41-60 mg per day the conversion factor is 10, and for more than 60 mg per day the conversion factor is 12.
This calculator was developed by the Oregon Department of Consumer and Business Services Workers' Compensation Division as part of the implementation of opioid use guidelines.
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