mEq/L Calculator: Convert mg/dL, mg/L & mmol/L to mEq/L

Calculate mEq/L from mg/dL, mg/L, or mmol/L using each ion’s molar mass and valence, convert mEq/L back to mg/dL, and check cation-anion balance.

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Required: choose an ion, then enter its concentration and unit.

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Meq/L Formula

The following formula is used to calculate the milliequivalents per liter (Meq/L) when concentration is in mg/L and molecular weight is in g/mol:

Meq / L = (C \times V) / MW

Variables:

C is the concentration in mg/L
MW is the molecular weight in g/mol
V is the valence of the substance

To calculate Meq/L, multiply the concentration by the valence and then divide by the molecular weight.

What is Meq/L?

Meq/L is a unit of concentration that stands for milliequivalents per liter. It is often used in chemistry and medicine to express the concentration of ions in a solution, taking into account the charge of the ions. This unit is particularly useful for solutions with electrolytes, where the chemical reactivity is dependent not only on the concentration but also on the charge of the ions present.

How to Calculate Meq/L?

The following steps outline how to calculate Meq/L:

First, determine the concentration (C) of the substance in mg/L.
Next, determine the molecular weight (MW) of the substance in g/mol.
Next, determine the valence (V) of the substance.
Use the formula Meq/L = (C × V) / MW to calculate the milliequivalents per liter.
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 (C) = 200 mg/L

Molecular Weight (MW) = 58.44 g/mol (for NaCl)

Valence (V) = 1 (for Na+ or Cl-) → Meq/L = (200 × 1) / 58.44 ≈ 3.4223 meq/L