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Millimoles (mmol) to Milligrams (mg) Converter

Convert millimoles to milligrams accurately. Includes a built-in database of 50+ common compounds (Glucose, NaCl, etc.) for automatic Molar Mass lookup.

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About

Converting between substance amount (mmol) and mass (mg) is a daily task in chemistry labs and clinical settings. Unlike simple metric conversions, this calculation requires a specific chemical constant: the Molar Mass (g/mol). Without it, the conversion is impossible.

This tool streamlines the process by integrating a searchable database of common reagents and biological markers. Whether you are calculating a buffer solution or analyzing blood glucose levels, this calculator ensures that the stoichiometric ratios are maintained with up to 4 decimal places of precision.

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Formulas

The formula connects mass, molar mass, and amount.

mmg = nmmol × Mg/mol

Note: Since mmol is 1/1000 of a mol and mg is 1/1000 of a gram, the numerical factor is 1:1. No additional power-of-10 conversion is needed if the units are strictly mmol and mg.

Reference Data

CompoundMolar Mass (g/mol)1 mmol equals
Water (H2O)18.01518.02 mg
Sodium Chloride (NaCl)58.4458.44 mg
Glucose (C6H12O6)180.156180.16 mg
Cholesterol386.65386.65 mg
Caffeine194.19194.19 mg

Frequently Asked Questions

Yes, provided you know the Molar Mass (Molecular Weight). Our database covers common ones, but you can manually enter any value in the Molar Mass field.
Yes. Mathematically: (1e-3 mol) * (X g/mol) = X * 1e-3 g = X mg. So 1 mmol of Glucose (180 g/mol) weighs exactly 180 mg.
This tool calculates total mass (mg) from total amount (mmol). If you have a concentration (mM or mmol/L), you must first multiply by volume (L) to get the amount in mmol.