# Milliequivalent Converter (mEq ↔ mg / mmol) Convert mEq ↔ mg/mmol (or mEq/L ↔ mmol/L, mg/L) from molecular weight and valence: mEq = mmol × valence, mg = mmol × MW. Not medical advice. > Canonical page: https://elysiatools.com/en/tools/milliequivalent-converter - **Category:** Health - **Keywords:** milliequivalent, meq, meq to mg, mg to meq, mmol to meq, valence, electrolytes, potassium chloride, calcium carbonate, unit conversion, pharmacy ## Overview The Milliequivalent Converter translates values between milliequivalents (mEq), millimoles (mmol), and milligrams (mg), as well as their corresponding concentration metrics (mEq/L, mmol/L, mg/L), using compound molecular weight and valence. ## Inputs - **Value** (number): Amount or concentration to convert. - **Input Unit** (select): Unit of the entered value (amount or concentration family). - **Molecular Weight (g/mol)** (number): Molecular weight in g/mol (KCl 74.55, Na 22.99, CaCO₃ 100.09). - **Valence** (number): Ionic valence/charge: Na⁺/K⁺/Cl⁻ = 1, Ca²⁺/Mg²⁺ = 2. - **Decimal Places** (number) ## When to use - Converting clinical electrolyte prescriptions between milliequivalents (mEq) and mass in milligrams (mg). - Comparing serum laboratory electrolyte concentrations reported in mEq/L, mmol/L, or mg/L across different hospital systems. - Formulating compounding pharmacy preparations and parenteral nutrition solutions requiring specific ionic charges. ## How it works - Enter the numeric value and select its unit from either the amount family (mEq, mmol, mg) or concentration family (mEq/L, mmol/L, mg/L). - Enter the compound or ion's molecular weight in g/mol and its ionic valence (charge). - Specify the desired decimal precision to calculate the converted equivalents across the unit family. ## Use cases - Dosing verification for potassium chloride (KCl) or sodium bicarbonate additive orders. - Normalizing clinical laboratory electrolyte panels between SI units (mmol/L) and conventional units (mEq/L). - Calculating elemental calcium content from bulk calcium carbonate (CaCO₃) salt weights. ## Frequently asked questions ### What formulas are used for mEq, mmol, and mg conversions? The tool calculates mEq = mmol × valence, mg = mmol × MW, and mEq = (mg × valence) / MW. ### Why are mEq and mmol identical for potassium and sodium? Monovalent ions such as K⁺, Na⁺, and Cl⁻ have a valence of 1, making 1 mmol equal to 1 mEq. ### Can I convert directly between an amount (mEq) and a concentration (mg/L)? No. Conversions occur strictly within either the amount family (mEq, mmol, mg) or concentration family (mEq/L, mmol/L, mg/L) because volume is required to cross between them. ### What valence should be used for divalent ions like calcium and magnesium? Set valence to 2 for divalent ions (such as Ca²⁺ and Mg²⁺), where 1 mmol provides 2 mEq. ### Does this tool provide clinical medical advice? 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