Convert mEq/L to mg/dL or reverse mg/dL to mEq/L using analyte-specific molecular weight and valence, with presets for common electrolytes and custom ions.

Convert ionic equivalents per liter to mass per deciliter.

Chemical unit conversion only. Use the exact reported ionic species; this does not interpret a medical test or select a dose.

mEq/L to mg/dL Conversion Formula

The following formula is used to convert a concentration from mEq/L to mg/dL.

mg / dL = (mEq / L × Molecular Weight) / (Valence × 10)

Variables:

  • mEq/L is the concentration in milliequivalents per liter
  • Molecular Weight is the molecular weight of the substance (g/mol)
  • Valence is the positive integer magnitude of the specified ion’s charge
  • mg/dL is the concentration in milligrams per deciliter

To convert mEq/L to mg/dL, multiply mEq/L by the molar mass in g/mol (numerically mg/mmol), then divide by the absolute ionic charge and 10. For the reverse direction, mEq/L = mg/dL × 10 × absolute charge / molar mass. Match the exact analyte; elemental-ion mass is not salt mass. This unit conversion does not interpret a medical test or select a dose.

mEq/L to mg/dL Conversion Table (Calcium, MW = 40.078 g/mol, z = 2)
mEq/L mg/dL
0.51.002
12.004
1.53.006
24.008
2.55.010
36.012
3.57.014
48.016
4.59.018
510.020
5.511.021
612.023
714.027
816.031
918.035
1020.039
1224.047
1530.059
2040.078
2550.098
* Rounded to 3 decimals. Assumes Calcium (MW 40.078 g/mol, valence = 2). Conversion: 1 mEq/L ≈ 2.0039 mg/dL; mg/dL = mEq/L × MW / (z × 10).

What is mEq/L?

mEq/L (milliequivalents per liter) is a unit of concentration often used in chemistry and medicine to express the amount of a substance in a solution. It takes into account the substance’s valence, or charge, providing a more accurate measure of the substance’s chemical combining power.

How to Calculate mg/dL from mEq/L?

The following steps outline how to convert the concentration from mEq/L to mg/dL.

  1. First, determine the concentration in mEq/L.
  2. Next, determine the molecular weight of the substance (g/mol).
  3. Next, determine the absolute charge number of the same specified ion.
  4. Use the formula to calculate the concentration in mg/dL.
  5. After inserting the variables and calculating the result, check your answer with the calculator above.

Example Problem:

Use the following variables as an example problem to test your knowledge.

Concentration (mEq/L) = 4 mEq/L

Molar mass = 40.078 g/mol for elemental calcium (Ca2+)

Absolute charge = 2 for Ca2+. Result: 4 × 40.078 / (2 × 10) = 8.0156 mg/dL.