Boyle's Law Calculator

PV constant: halve the volume, double the pressure.

Written and maintained by Mohit PatelLast checked August 4, 2026How we build these

Initial pressure

atm

Initial volume

Final pressure

atm

Final volume (L)

2 L → 1 L

Initial volume2 L

Final volume1 L

Initial pressure1 atm

Final pressure2 atm

Boyle's law: at fixed temperature, PV is constant, so halving the volume doubles the pressure. It is the combined gas law with the temperature terms cancelling.

How the Boyle's Law Calculator works

At fixed temperature the product of pressure and volume is constant, so halving the volume doubles the pressure. It is the combined gas law with the temperature terms cancelling.

Also known as: p1v1 = p2v2 calculator · pressure volume calculator · boyle's law formula · inverse pressure volume relationship

Where to go next

The Boyle's Law question rarely arrives on its own. These are the ones that usually come with it:

Charles's Law Calculator — V/T constant, and only in kelvin.
Combined Gas Law Calculator — P₁V₁/T₁ = P₂V₂/T₂, with kelvin handled for you.
Ideal Gas Law Calculator — PV = nRT, solving for whichever term is missing.
Speed Distance Time Calculator — Any one of the three from the other two, in four units.

Sources

Frequently asked questions

What is Boyle's law?

P₁V₁ = P₂V₂ at constant temperature. Pressure and volume are inversely proportional.

Where does it apply in practice?

Syringes, diving, and lungs. A diver's air volume halves at 10 metres because the pressure doubles, which is why ascending while holding your breath is dangerous.

Does temperature need to be constant?

Yes — that is the condition of the law. If temperature changes as well, use the combined gas law instead.

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