💨Ideal Gas Law Calculator

Solve PV = nRT for pressure, volume, moles, or temperature — with full unit conversion.

Pressure P

Volume V

Moles n

Temperature T

Runs entirely in your browser. No data is sent to a server.

Free Ideal Gas Law Calculator

Need to solve PV = nRT but the units keep tripping you up? Our free ideal gas law calculator handles the conversions for you. Enter any three of pressure, volume, moles, or temperature — in whichever units you have — and it solves for the missing value using the correct gas constant automatically.

All pressure, volume, and temperature units are converted internally before solving, and temperature is always checked against absolute zero to catch impossible inputs. Every step is shown, from unit conversion through to the final rearranged formula, so you can follow exactly how the answer was reached. A quick STP toggle is included for standard-condition problems.

Perfect for chemistry and physics coursework, it runs entirely in your browser. No sign-up, no downloads, no limits. See the About page or the FAQ for more.