Opioid Conversion Calculator

Written by Great Medico

Updated September 24, 2026 •2 min read

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Medication calculations can look deceptively simple: one unit or branch can change the answer. Opioid Conversion Calculator keeps the exact inputs used by this calculator visible so the result can be checked rather than trusted blindly.

What this calculator does

Opioid Conversion Calculator uses Incomplete cross tolerance reduction, Morphine IV, Morphine oral, Morphine SC, Diamorphine SC, Oxycodone oral, and the remaining displayed fields to produce the opioid equivalence table used by this calculator. It only uses the fields shown in this calculator; it does not silently add tests, diagnoses, symptoms, or clinical variables that are absent from the interface. Mirrors the live simultaneous opioid-equivalence fields. The engine normalizes entered values to the published 10 mg IV morphine equivalence and fills the equivalent-dose table.

How to use it

Enter or select Incomplete cross tolerance reduction, Morphine IV, Morphine oral, Morphine SC, Diamorphine SC, and the remaining displayed fields. Double-check the medication, route or formulation choices, weight/unit conversions, and concentration before relying on the output. If an input is unknown, it is better to leave the calculation unresolved than to invent a value.

How the calculation works

Each non-zero opioid entry is converted to a common 10 mg IV-morphine-equivalent basis using the table built into the calculator. If more than one source opioid is entered, the engine averages the normalized equivalents, then applies the selected incomplete-cross-tolerance reduction and converts that adjusted IV-morphine equivalent back across the displayed opioid table.

Example

Using the calculator’s prefilled demonstration values, the primary output is 10 mg IV morphine equivalent, labeled “Opioid equivalence table”; Cross-tolerance reduction is 0% and Morphine IV is 10 mg. That sample is useful for checking the calculation path, but real interpretation should use verified measurements from the same clinical or study context.

How to interpret the result

Use the table to understand approximate relative potency only. The cross-tolerance reduction is still a simplified safety adjustment; the clinically chosen new dose is often lower and depends on the opioid, route, duration of therapy, pain status, and patient-specific risk.

Limitations and notes

Equianalgesic tables vary and cannot capture incomplete cross-tolerance, genetics, organ function, active metabolites, route differences, tolerance, or opioid-use-disorder treatment. Do not use this table as a self-directed opioid-switching or tapering plan; overdose can result from apparently reasonable arithmetic.