Ideal gas law 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
PV = nRT
Where this usually goes wrong
R is 0.08206 L·atm/(mol·K) here, so pressure is in atm and temperature in kelvin. Add 273.15 to a Celsius figure first.
Worked example
1 mol at 0 °C and 1 atm occupies 22.4 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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