When switching between opioids, equianalgesic conversions may overestimate the potency of the new opioid due to incomplete cross-tolerance. Incomplete cross-tolerance can occur due to variability in opioid binding. An intuitive drum-dial opioid calculator. Beautifully designed for quick Methadone, Fentanyl, and Hydromorphone conversions with cross-tolerance built in. The opioid conversion calculator tells you equivalent doses of analgesic drugs, such as morphine, fentanyl, or tramadol. Guidance on Opioid Switching. Enter 24-hour total doses below, then click the convert button to display 24-hour equianalgesic doses. Convert your patient’s opioid daily dose to the Morphine Equivalent Dose (MED) by using this online calculator. The Opiate Conversion Calculator converts between different types and routes of opiates. Opioid equivalent doses calculator. Opioid conversions based on equianalgesia -potency for all of the common opioids hydrocodone, oxycodone, morphine, etc The half life of the two drugs needs to be considered when converting so that the patient does not experience breakthrough pain or receive too much opiate during the conversion period. Opioid equivalence should NOT be used for opioid conversion. To do so is an inappropriate and potentially dangerous misunderstanding of the tool. Instructions: Fill in the mg per day * for whichever opioids your patient is taking. The web page will automatically calculate the total morphine equivalents per day.