How does the Osmolality Calculator work?

Calculate: Osm = 2[Na] + (Glu/18) + (BUN/2.8) Then: Normal: 280-310 mOsm/kg Then: Compare measured to calculated osmolality.

Can you give an example of how to use the Osmolality Calculator?

Example: Input Na 128, glucose 200, BUN 28 gives a result of Osm ≈ 318 (high), measured lower suggests hyponatremia (Pseudohyponatremia likely).

Is the Osmolality Calculator free to use?

Yes — completely free with no registration, download, or subscription required. All calculations happen instantly in your browser.

How accurate is the Osmolality Calculator?

Our Osmolality Calculator uses verified mathematical formulas and is accurate to multiple decimal places. Results are calculated in real-time using the same methods used by professionals.

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Osmolality Calculator

Serum Osmolality

Sodium (mEq/L)

Glucose (mg/dL)

BUN (mg/dL)

Osmolality measures solute concentration in body fluids. It's critical for diagnosing hyponatremia, hypernatremia, and fluid disorders.

Symbol	Name	Unit	Description
Na	Na value	—	Variable used in the calculation
BUN	BUN value	—	Variable used in the calculation

Difficulty:intermediate

References

›Osmolality — Wikipedia

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Osmolality Calculator

Serum Osmolality

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Serum Osmolality