About this tool
Solve the ideal gas law PV = nRT for any one variable by entering the other three; calculations run live in your browser with R = 8.314 J/(mol·K).
Frequently asked questions
What units are expected?
Pressure in kilopascals (kPa), volume in litres (L), amount in moles (mol) and temperature in kelvin (K). With these units kPa·L equals joules, so R = 8.314 applies directly.
How do I convert °C to K?
Add 273.15 to the Celsius temperature to get kelvin before entering it, since the gas law requires an absolute temperature.