Enter the value in mmol/L and select the ion or electrolyte to determine the equivalent concentration in mEq/L, or use the formula below to convert manually.
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mmol/L to mEq/L Formula
The following formula is used to convert a concentration from millimoles per liter to milliequivalents per liter.
mEq/L = mmol/L × |z|
To convert in the opposite direction, divide the mEq/L value by the absolute charge of the ion.
Variables:
- mEq/L is the concentration in milliequivalents per liter
- mmol/L is the concentration in millimoles per liter
- |z| is the absolute value of the ion’s electrical charge, also called valence
For ions with a single charge such as sodium, potassium, chloride, and bicarbonate, the mmol/L value and mEq/L value are numerically the same. For calcium and magnesium, multiply by 2. For phosphate, multiply by 3.
What is mmol/L to mEq/L Conversion?
Converting mmol/L to mEq/L is a way of expressing concentration that accounts for both the amount of a substance and its electrical charge. While mmol/L measures the number of particles present in a liter of solution, mEq/L adjusts that amount based on how many charges each particle carries. This is why monovalent ions such as sodium (Na⁺) and potassium (K⁺) have the same numerical value in mmol/L and mEq/L, while divalent ions such as calcium (Ca²⁺) and magnesium (Mg²⁺) produce an mEq/L value that is twice as large.
This conversion is commonly used in clinical medicine, chemistry, and laboratory interpretation because electrolytes are often discussed in terms of their charge contribution rather than only their particle count.
Common mmol/L to mEq/L Examples
- For Na⁺, K⁺, Cl⁻, and HCO₃⁻ (|z| = 1): 10 mmol/L = 10 mEq/L
- For Ca²⁺ and Mg²⁺ (|z| = 2): 10 mmol/L = 20 mEq/L
- For PO₄³⁻ (|z| = 3): 3 mmol/L = 9 mEq/L
mmol/L to mEq/L Conversion Table
The following table shows example conversions for a concentration of 10 mmol/L.
| Ion | |z| | 10 mmol/L in mEq/L |
|---|---|---|
| Sodium (Na⁺) | 1 | 10 mEq/L |
| Potassium (K⁺) | 1 | 10 mEq/L |
| Chloride (Cl⁻) | 1 | 10 mEq/L |
| Bicarbonate (HCO₃⁻) | 1 | 10 mEq/L |
| Calcium (Ca²⁺) | 2 | 20 mEq/L |
| Magnesium (Mg²⁺) | 2 | 20 mEq/L |
| Phosphate (PO₄³⁻) | 3 | 30 mEq/L |
How to Convert mmol/L to mEq/L?
The following steps outline how to convert mmol/L to mEq/L.
- First, determine the concentration in mmol/L.
- Next, identify the ion and its absolute electrical charge, |z|.
- Multiply the mmol/L value by |z| using the formula mEq/L = mmol/L × |z|.
- After calculating the result, verify your answer with the converter above.
Example Problem:
Use the following values as an example problem to test your knowledge.
Concentration = 10 mmol/L
Ion = Calcium (Ca²⁺)
mEq/L = 10 × 2 = 20 mEq/L
Because calcium is divalent, each mmol contributes two milliequivalents. That is why the converted value is 20 mEq/L instead of 10 mEq/L.