Boyle's Law Calculator

At constant temperature, the pressure of a fixed amount of gas is inversely proportional to its volume. Squeeze it to half the volume and the pressure doubles.

Results update as you type.

Final volume

2 L

In mL
2,000 mL
In m³
0.002 m³
In cm³
2,000 cm³

About this calculator

Find any one of the four values.

How to use it

  1. Choose what to find, enter the other values with their units, and read the answer in every common unit.

The formula

P₁ × V₁ = P₂ × V₂
P₁, V₁
initial pressure and volume
P₂, V₂
final pressure and volume

Worked example

6 L of gas at 1 atm compressed to 3 atm

  1. V₂ = 1 × 6 ÷ 3 = 2 L.

What the result means

A syringe with a blocked end shows Boyle’s law: pushing the plunger raises the pressure.

Assumptions

  • Constant temperature and amount of gas.

Limitations

  • Ideal gas behaviour.

Frequently asked questions

What does Boyle’s law state?

At constant temperature, pressure × volume is constant for a fixed amount of gas.

Can I mix units?

Yes, each value has its own unit.

Is it the same as PV = nRT?

It is a special case with n and T constant.

Last reviewed on 6 October 2026. Found a mistake? Tell us.