Ideal Gas Law Calculator (PV = nRT)

Which of the four gas variables you want; enter the other three below.

• Pressure: force per area the gas exerts.
• Volume: space the gas fills.
• Amount (moles): how much gas there is.
• Temperature: absolute temperature of the gas.

The gas pressure, read in the unit selected just below. Ignored when you are solving for pressure.

Standard atmospheric pressure is 1 atm.

Which pressure unit the value above is in; the tool converts internally to pascals.

1 atm ≈ 101.325 kPa ≈ 760 mmHg.

The gas volume in litres. Ignored when you are solving for volume.

One mole of ideal gas fills 22.414 L at STP.

The amount of gas in moles. Ignored when you are solving for the amount.

Use the Mole Calculator to turn a mass into moles.

The gas temperature, in the unit chosen below. Ignored when solving for temperature.

It is converted to kelvin before use, because PV = nRT needs absolute temperature.

Which scale the temperature above is on.

• °C: Celsius, 0 °C is freezing water.
• K: kelvin, absolute zero is 0 K.
• °F: Fahrenheit.