Osmolarity & TonicityChemistry
Osmolarity, Osmolality & Solution Tonicity Calculator
Calculate solution osmolarity (mOsm/L), osmolality (mOsm/kg), and clinical tonicity classification (hypotonic, isotonic, hypertonic) for intravenous and physiological fluids.
Calculated Result
Solution Osmolarity
308mOsm/L
Calculator Inputs
M
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particles
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Solution Osmolarity
308mOsm/L
Estimated Osmolality
314.16 mOsm/kg
Osmotic Pressure at 37°C
7.84 bar
Osmotic Balance Metrics
Osmolarity
308 mOsm/L(50%)
Osmolality
314.16 mOsm/kg(50%)
Standard biochemical and medical chemistry tool for osmotic balance and intravenous fluid administration.
Calculation Methodology
Osmolarity (mOsm/L) = Molarity (mol/L) * van 't Hoff factor (i) * 1000. Human plasma normal osmolarity is 280-295 mOsm/L.
Frequently Asked Questions
Osmolarity counts all dissolved solute particles, whereas tonicity only considers effective impermeable solutes that pull water across cell membranes.
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