mEq/L to mg/L Converter

Convert mEq/L to mg/L instantly with molecular-weight and valence-based results.

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How This Tool Works

Converting milliequivalents per liter (mEq/L) to milligrams per liter (mg/L) depends on the ion's molecular weight and valence. The calculator uses mg/L = mEq/L x molecular weight / valence.

For example, calcium has a molecular weight of 40.08 g/mol and a valence of 2, so 5 mEq/L equals 5 x 40.08 / 2 = 100.20 mg/L.

  • Input: Concentration in mEq/L plus molecular weight and valence.
  • Output: mg/L, mmol/L, mol/L, and equivalent weight.
  • Preset ions: Common ions such as Na+, Ca2+, Mg2+, and Cl- fill in standard molecular weight and valence values.

Why This Matters in Health Monitoring

Electrolyte concentrations may be reported in mEq/L, mmol/L, or mg/L depending on the lab, instrument, or reference material. Keeping the units straight helps avoid misreading values for sodium, potassium, calcium, magnesium, chloride, bicarbonate, and other clinically important ions.

Do not treat mEq/L and mg/L as numerically equal. For sodium (Na+), 1 mEq/L is about 22.99 mg/L because sodium's molecular weight is 22.99 g/mol and its valence is 1.

Common Mistakes to Avoid

  • Do not multiply by valence: For mg/L, divide molecular weight by valence, then multiply by mEq/L.
  • Use valence magnitude: Enter 1, 2, or 3 for charge size; the sign of the ion does not make concentration negative.
  • Check the ion form: Different ions of the same element can have different valence values, such as Fe2+ and Fe3+.

Frequently Asked Questions

Common questions about the mEq/L to mg/L Converter

Concentration describes how much of a substance is present in a mixture. It can be expressed as mass/volume (mg/L), molar (mol/L), parts per million (ppm), or percentage.
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Sources & References

International System of Units (SI): amount-of-substance concentration

Amount-of-substance concentration is measured in the mole per cubic metre (mol/m³). Conversions between SI and other units use exact, internationally agreed factors maintained by NIST.
→Source: NIST — International System of Units (SI)

International System of Units (SI)

Authoritative definitions for amount-of-substance concentration, from the BIPM SI Brochure (9th edition), the defining reference for the SI.
→Source: BIPM — SI Brochure (9th ed.)

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