Calculator · MSK / pain

Oral morphine equivalent (OME)

Oral morphine equivalent — the conversion factors, as a reference card (no dose is calculated here).

What it is for

Chronic non-cancer pain safety — Opioids Aware (Faculty of Pain Medicine, 2026): ideally ≤50 mg/day OME; seek specialist advice before escalating towards about 120 mg/day (local high-dose guidance).

Use the working calculator

The working Oral morphine equivalent (OME) calculator is on our calculators page. It is free and needs no account. Enter the values and it shows the result with the reading that goes with it.

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What you enter

The calculator asks for 2 items.

  • Opioid (oral, total per day)Options: Morphine (oral); Codeine; Dihydrocodeine; Tramadol; Oxycodone (oral); Tapentadol
  • Total dose per day (mg/day)

How the result is read

The result is shown as OME in mg/day. Formula: OME = total daily dose × conversion factor.

The calculator reports one of these readings, with the action that goes with it: Lower dose; Caution zone; High-risk dose.

Sources

These are the sources the calculator cites. Check the current version before relying on a threshold.

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For qualified clinicians. A score supports a clinical decision and does not make it: check the inputs, read the cited source, and use the tools in your clinical system for patient care where one is provided.