About the Combined Gas Law Calculator
Combined gas law P₁V₁/T₁ = P₂V₂/T₂ — solve for any one of the six values.
Also known as: general gas equation, p1v1/t1 = p2v2/t2, combined gas equation.
How to use this calculator
- Enter solve for and the other fields.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
P₁V₁ / T₁ = P₂V₂ / T₂
Worked example
Using the values pre-filled in the calculator above:
- Solve for: Final volume
- Initial pressure = 101.3 kPa
- Initial volume = 2 L
- Initial temperature = 293.15 K
- Final pressure = 202.6 kPa
- Final temperature = 293.15 K
the calculator returns:
- Final volume: 1 L
- In millilitres: 1,000