Calculate morphine milligram equivalents for daily opioid doses, including single-drug conversions and total MME for multiple opioids.

MEQ / MME Opioid Dose Calculator

Enter daily opioid amounts, then calculate total morphine equivalents.

Multiple Opioids
Single Conversion
Opioid
Daily amount
Morphine equivalents
Buprenorphine transdermal
mcg/hr
0
Codeine
mg/day
0
Fentanyl transdermal
mcg/hr
0
Hydrocodone
mg/day
0
Hydromorphone
mg/day
0
Methadone
mg/day
0
Morphine
mg/day
0
Oxycodone
mg/day
0
Oxymorphone
mg/day
0
Tapentadol
mg/day
0
Tramadol
mg/day
0
Methadone uses tiered factors: 1-20 mg/day x4, 21-40 x8, 41-60 x10, 61+ x12.
Transdermal fentanyl and buprenorphine are calculated from mcg/hr unless another unit is selected.
Show calculation steps ▼

mEq Formula

The following formula is used to calculate the milliequivalent (mEq) of a substance. 

mEq = mg * V / MW
  • where mEq is the milliequivalent
  • mg is the milligrams of substance
  • V is the valence of the substance
  • MW is the molecular weight of the substance

To calculate mEq, multiply the milligrams by the valence of the substance, then divide by the molecular weight of the substance.

mEq Definition

mEq is short for milliequivalent. The milliequivalent is a measure of the combining power of an element relative to the activity of 1 mg of hydrogen. This term is most often associated with electrolytes.

Example Problem

How to calculate mEq?

  1. First, determine the mg of the substance.

    In this example, there is a total of 25mg of substance.

  2. Next, determine the valence.

    The valence of this material is 3.

  3. Next, determine the molecular weight.

    The molecular weight is found to be 40 mg/mol.

  4. Finally, calculate the mEq.

    Using the formula above, the milliequivalent is calculated to be:
    mEq = mg * V / MW
    mEq = 25*3/40
    mEq = 1.875