Boyle's Law Calculator
Pressure and volume at constant temperature.
Enter your values
ⓘ Live results
Results
- Final pressure
- 2.4 atm
- Pressure change
- 0.9 atm
- Volume ratio
- 1.6
- Constant P×V
- 6
Working
- 1P₂ = (1.5 × 4) ÷ 2.5 = 2.4 atm
Quick answer
At constant temperature, gas pressure and volume are inversely proportional, so P₁V₁ = P₂V₂.
P₁V₁ = P₂V₂
How to use the Boyle's Law Calculator
- 1Enter the initial pressure and volume.
- 2Enter the new volume.
- 3Keep units consistent throughout.
Worked example
Using the values the calculator loads with:
Inputs
- Initial pressure1.5 atm
- Initial volume4 L
- Final volume2.5 L
Results
- Final pressure2.4 atm
- Pressure change0.9 atm
- Volume ratio1.6
- Constant P×V6
- P₂ = (1.5 × 4) ÷ 2.5 = 2.4 atm
Frequently asked questions
Does temperature matter?
Boyle's law assumes it is constant; otherwise use the combined gas law.
Is it exact?
It is an ideal-gas approximation — real gases deviate at high pressure.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.