This calculator is easy to use, and references a commonly used equianalgesic dosing table.
I recommend checking with your health-system to see whether this is the ratio card your institution uses.
*it includes ratio options taught through EPEC - which is what major academic institutions use, including Institute for Palliative Care at San Diego Hospice.
I disagree with the previous commentator suggesting it uses dangerous conversions.
Suzanakm about Opioids Dosage Conversion