mEq/L to mg/L Calculator
Convert milliequivalents per liter to milligrams per liter using molecular weight and ionic charge.
Convert ionic concentrations for laboratory analysis, medical testing, and water quality assessment across chemistry and healthcare applications.
Concentration Converter
Milliequivalents per liter
Select predefined ion or choose custom
Molecular Weight: 23.0 g/mol
Valence: 1
Conversion Results
Enter concentration and select ion, then click "Calculate"
to see mg/L conversion results
mEq/L to mg/L Conversion
In chemistry, medicine, and water quality testing, concentrations can be expressed in different ways. Milliequivalents per liter (mEq/L) measures ionic charge concentration, while milligrams per liter (mg/L) measures mass concentration. Converting between these units requires knowledge of the ion's molecular weight and electrical charge.
This calculator handles the conversion automatically by using the appropriate molecular weight and valence for common ions, or allowing you to input custom values for less common substances. It's an essential tool for laboratory work, medical analysis, and environmental monitoring.
The Conversion Formula
The relationship between mEq/L and mg/L is:
This formula accounts for both the mass of the ion and its electrical charge:
- Molecular weight represents the mass per mole of the substance
- Valence (charge) adjusts for how many charges each ion carries
- mEq/L considers charge, mg/L considers mass
Common Ion Conversions
Here are conversions for frequently analyzed ions:
| Ion | mEq/L | Molecular Weight | Valence | mg/L |
|---|---|---|---|---|
| Na⁺ | 2.0 | 23.0 | 1 | 46.0 |
| K⁺ | 1.5 | 39.1 | 1 | 58.7 |
| Ca²⁺ | 3.0 | 40.1 | 2 | 60.2 |
| Mg²⁺ | 2.5 | 24.3 | 2 | 30.4 |
| Cl⁻ | 5.0 | 35.5 | 1 | 177.5 |
| HCO₃⁻ | 4.0 | 61.0 | 1 | 244.0 |
| PO₄³⁻ | 1.0 | 95.0 | 3 | 31.7 |
| SO₄²⁻ | 2.0 | 96.1 | 2 | 96.1 |
When working with polyvalent ions (charge > 1), remember that the same mass concentration will give different mEq/L values. A divalent ion will have half the mEq/L of a monovalent ion with the same mass concentration.