Milligrams, Millimoles, Milliequivalents and Milliosmoles
Converts a salt quantity among mg, mmol, mEq and ideal mOsm, from its formula or molecular weight.
Open the tool → Runs in your browser. Data leaves only if you deliberately send a problem report from the interactive tool.
Example
- Quantity
- 600
- Unit of the quantity
- mg
- Formula of the form weighed
- KCl
- Valence: total positive charge per formula unit
- 1
- Particles on complete dissociation
- 2
Result: 600 mg = 8.04851 mmol = 8.04851 mEq = 16.097 mOsm (ideal).
The tool opens with these values already filled in. Replace them with your own.
What you enter
- Quantity
- Unit of the quantity
- Formula of the form weighed (give this or the molecular weight)
- Molecular weight
- Valence: total positive charge per formula unit (blank gives millimoles only)
- Particles on complete dissociation (blank gives no milliosmoles)
- Volume, for per-liter values (optional)
- Label check (optional)
How this is calculated
Citation
Definitions: mmol = mg ÷ molecular weight; mEq = mmol × valence; ideal mOsm = mmol × particles. Molecular weight from the formula by the IUPAC CIAAW Abridged Standard Atomic Weights 2024. The valence is entered, never assumed. Read the source ↗
A reference and educational tool. Not medical, legal, or financial advice, and not a substitute for clinician judgment.