Boyle's Law Calculator
Calculate the unknown pressure or volume assuming constant temperature and moles.
How to Use This Calculator
1
Enter initial pressure P1
Use consistent units for pressure and volume across all inputs.
2
Enter initial volume V1
Any volume unit works as long as you stay consistent.
3
Enter final pressure P2
Click Calculate to get the final volume V2.
Formula
P1 × V1 = P2 × V2
Example: P1=1 atm, V1=2 L, P2=0.5 atm → V2=4 L
About Boyle's Law
At constant temperature, the pressure and volume of an ideal gas are inversely proportional.
Applications
- Syringes and pistons
- Scuba diving and pressure changes
- Gas compression/expansion processes
Frequently Asked Questions
Do units have to be SI?
No, but they must be consistent between P and V pairs.
Is temperature constant?
Yes, Boyle's law assumes isothermal conditions.