Boyle's Law Calculator
💨 Gas Laws & Fluids. Use the Boyle's law formula to find pressure 1, volume 1, pressure 2, volume 2: pick the value you want, type the others, and the answer updates as you go.
Pick the ○ next to the value you want to find, fill in the others, and it solves as you type.
What each letter means
| Quantity | Unit |
|---|---|
| Pressure 1 | kPa |
| Volume 1 | L |
| Pressure 2 | kPa |
| Volume 2 | L |
Worked example
Find the pressure 1 when Volume 1 = 2 L, Pressure 2 = 200 kPa, Volume 2 = 1 L.
Using P1 V1 = P2 V2: Pressure 1 = 100 kPa.
Frequently asked questions
What is the formula for Boyle's law?
P1 V1 = P2 V2.
What do the letters stand for, and what units are used?
Pressure 1 in kPa, Volume 1 in L, Pressure 2 in kPa, Volume 2 in L.
How do you calculate pressure 1?
Put the values into P1 V1 = P2 V2. For example, with Volume 1 = 2 L, Pressure 2 = 200 kPa, Volume 2 = 1 L, pressure 1 = 100 kPa.
Can I solve for a different value?
Yes. In the calculator above, pick the circle next to any value (pressure 1, volume 1, pressure 2, volume 2) and fill in the others: it rearranges the formula for you.
