How to interpret opioid conversion results
Equianalgesic conversions are estimates, not dose recommendations. Published tables differ, and patient factors can change how a result should be used.
Why conversion factors vary
Ratios can differ between references because they draw on different populations, endpoints, routes, dose ranges, and levels of evidence. Some conversions are non-linear or especially sensitive to clinical context. A single number should not be treated as universally correct.
Before using a result
- Use results only as an estimate for a trained clinician.
- Confirm the medicine, route, formulation, dose units, and time period before interpreting a result.
- Check the result against local policy, product information, and a current clinical reference.
- Consider incomplete cross-tolerance, organ function, age, comorbidities, concurrent medicines, and prior opioid exposure.
- Seek specialist advice for complex, high-risk, or dose-dependent conversions.
Local conversion factors
OpioidCalc supports custom conversion factors so a clinician can match an approved local reference. Changing a factor does not validate it; the clinician or organisation remains responsible for selecting and governing the source used.
Sources and further reading
These sources are included for comparison. They do not endorse OpioidCalc, and the app does not necessarily use their conversion factors.
Last updated 30 August 2026. Also read the Terms of Service.