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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.
Execution
Fill in the form, run the tool, and review the result in one place.
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Tool usage guide
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.
Background
A physician orders 20 mEq of potassium chloride (KCl) for an IV additive.
Problem
The pharmacist needs to verify the mass in milligrams of KCl (MW 74.55 g/mol, valence 1) to cross-check inventory stock.
How to use
Input 20 with unit mEq, set Molecular Weight to 74.55, Valence to 1, and Decimal Places to 2.
Outcome
Calculates that 20 mEq corresponds to 20 mmol and 1491.00 mg of KCl.
Background
A multicenter trial receives laboratory reports of serum sodium in mEq/L that must be archived alongside mmol/L and mg/L values.
Problem
Convert a standard patient sodium reading of 140 mEq/L (MW 22.99 g/mol, valence 1) to mmol/L and mg/L.
How to use
Input 140 with unit mEq/L, set Molecular Weight to 22.99, Valence to 1, and Decimal Places to 2.
Outcome
Yields 140.00 mmol/L and 3218.60 mg/L.
The tool calculates mEq = mmol × valence, mg = mmol × MW, and mEq = (mg × valence) / MW.
Monovalent ions such as K⁺, Na⁺, and Cl⁻ have a valence of 1, making 1 mmol equal to 1 mEq.
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.
Set valence to 2 for divalent ions (such as Ca²⁺ and Mg²⁺), where 1 mmol provides 2 mEq.
No. This converter performs stoichiometric calculations for informational and educational use only.
Background
A formulation protocol specifies 500 mg of calcium carbonate (CaCO₃, MW 100.09 g/mol, valence 2 for Ca²⁺).
Problem
Determine the milliequivalents of calcium provided by a 500 mg dose of CaCO₃.
How to use
Input 500 with unit mg, set Molecular Weight to 100.09, Valence to 2, and Decimal Places to 2.
Outcome
Yields 5.00 mmol and 9.99 mEq of Ca²⁺.