Osmolarity Calculator
Calculate the osmolarity of a solution based on the concentrations of its solutes. Useful for medical, biological, and chemical applications.
Published by:
isCalculator Editorial Team
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How to use this tool?
How to Use the Osmolarity Calculator
- Enter all six values in the fields provided. All inputs are required and must be numbers (decimals allowed).
- Units: Sodium, Potassium, Chloride, and Bicarbonate are in mmol/L. Glucose and BUN are in mg/dL.
- Click "Calculate Osmolarity" to compute the result.
- Read the result displayed in mOsm/L. The formula used is:
2 × Na + Glucose/18 + BUN/2.8. - If an error appears, ensure all fields are filled with non-negative numbers.
Tip: This calculator estimates serum osmolarity using the standard clinical formula. Potassium, Chloride, and Bicarbonate are collected but not used in the calculation.
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Frequently Asked Questions
Osmolarity is a measure of solute concentration per liter of solution, expressed in milliosmoles per liter (mOsm/L). It is commonly used in medicine to assess body fluid balance.
The formula used is: Osmolarity = 2 × Na + Glucose/18 + BUN/2.8, where Na is sodium in mmol/L, Glucose in mg/dL, and BUN in mg/dL.
Normal serum osmolarity ranges from 275 to 295 mOsm/L. Values outside this range may indicate dehydration, overhydration, or other medical conditions.
