Home / Tools / Ideal gas law calculator

Ideal Gas Law Calculator

Solve PV = nRT for pressure, volume, amount of gas, or temperature. Mix SI and US customary units, enter gauge or absolute pressure, and get gas density, mass, and standard volume alongside the answer.

Solve for

Pressure

Calculates as you type · R = 8.314462618 J/(mol·K)

Pressure, P

Unit

Volume, V

Unit

Amount of gas, n

Unit

Temperature, T

Unit

Gas (for mass & density)

Molar mass, g/mol

Show result in

Gauge pressures (psig, barg) are converted to absolute using 1 atm (101.325 kPa). At altitude, enter absolute pressure.
Standard volume: Nm³ at 0 °C and 1 atm; SCF at 60 °F and 14.696 psia.
Ideal gas only. For high pressure or near condensation, use a compressibility factor or an equation of state.

Have a project in mind?

Get in touch with ONB Engineering to talk it through.

Schedule a call Email ONB