Serum Osmolality Calculator
Result
Calculated result
290
Based on the values entered.
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Serum Osmolality Calculator — free online calculator.
Formula
Osmolality = 2 * Na + glucose/18 + BUN/2.8
- Serum Osmolality Calculator calculates its result from Sodium, Glucose, BUN, Measured osmolality (optional). It uses the formula Osmolality = 2 * Na + glucose/18 + BUN/2.8. Change any input to recalculate the result instantly. This is an informational calculation and is not medical advice.
- The main inputs are Sodium, Glucose, BUN, Measured osmolality. Enter them in the units and format shown in the calculator.
- Use the measurement units shown beside each field. The result is an estimate and should be interpreted in context.
- Changing any input above recalculates the result with the same calculation engine used by this page.
Example: Serum Osmolality
Inputs
- Sodium: 140
- Glucose: 90
- BUN: 14
- Measured osmolality: 0 optional
Using Sodium = 140, Glucose = 90, BUN = 14, Measured osmolality (optional) = 0, the calculated result is 290.
Sample result: Calculating…
Frequently asked questions
What does the Serum Osmolality calculate?
Serum Osmolality Calculator — free online calculator.
Which values should I enter?
Enter Sodium, Glucose, BUN, Measured osmolality using the units and format shown beside each field.
What formula does this calculator use?
The calculator uses the following relationship: Osmolality = 2 * Na + glucose/18 + BUN/2.8.
Why might my result differ from another source?
Results can differ because measurement methods, rounding and assumptions vary. This calculator is an estimate and is not a medical diagnosis.
Does the result update automatically?
Yes. Changing an input updates the result using the same calculation engine shown on this page.