Molarity calculator
Fill in what you know and leave the unknown box empty — it works out whichever one is missing. Nothing is uploaded; the arithmetic happens in your browser.
The formula
M = n ÷ V
Where this usually goes wrong
Volume must be in litres. A 250 mL flask is 0.25 L — this is where most marks are lost.
Worked example
0.5 mol in 2 L is 0.25 mol/L.
Those numbers are already in the boxes above — press Work it out to see it, then change them for your own.
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