Charles's Law Calculator
Volume and temperature at constant pressure.
Enter your values
ⓘ Live results
Results
- Final volume
- 3.1292 L
- Volume change
- 0.6292 L
- Temperature ratio
- 1.2517
- Initial temperature in °C
- 24.85
- Final temperature in °C
- 99.85
Quick answer
At constant pressure, gas volume is directly proportional to absolute temperature in kelvin.
V₁/T₁ = V₂/T₂
How to use the Charles's Law Calculator
- 1Enter the initial volume.
- 2Enter both temperatures in kelvin.
- 3Convert °C to K by adding 273.15.
Worked example
Using the values the calculator loads with:
Inputs
- Initial volume2.5 L
- Initial temperature298 K
- Final temperature373 K
Results
- Final volume3.1292 L
- Volume change0.6292 L
- Temperature ratio1.2517
- Initial temperature in °C24.85
- Final temperature in °C99.85
Frequently asked questions
Why kelvin?
The law is proportional to absolute temperature; celsius would give nonsense at low values.
What happens at 0 K?
Volume theoretically goes to zero — real gases liquefy long before then.
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.