Background and Aims
There are a vast number of opioid calculators available to use online.  These calculators have been demonstrated to lack consistency in opioid equivalence.  The aim of this project was to assess the quality of the most commonly used online opioid calculators and whether their use can be recommended.

Methods
Online opioid calculators were found using the Google search engine, searching for the terms “opioid calculator” and “morphine conversion”.  The searches were performed for the 6 main English language speaking regions, United Kingdom, United States, Ireland, Canada, Australia and New Zealand.  The first 10 opioid calculators that were found in each region using each of the search terms were considered.  The AGREE II instrument was applied to the calculators in order to assess the quality of the calculators.  To assess whether a calculator could be recommended for use in clinical practice, the calculator would have to score at least 75% across all domains.

Results
13 online opioid calculators were found.  Using the AGREE II instrument, the scores across the domains ranged from 0% to 72.2%. No calculator scored greater than 50% across all domains for quality.

Conclusions
The commonly used calculators available have now been shown to lack quality and well as consistency.  This study has found that online opioid calculators cannot be recommended for use in clinical practice.

OPIOID CALCULATORS: QUALITY OR JUST QUANTITY?