Charles's Law Calculator

Your details

Pick the scale your temperatures are in. Values are converted to kelvin internally because the law needs an absolute scale.
Both volumes use this unit. Units cancel in the ratio, so the solve is the same; the unit only matters for the optional moles step.
Volume before the change. Leave blank to solve for it.
L
Temperature before the change, in the unit chosen above. Leave blank to solve for it.
K
Volume after the change, same unit as V₁. Leave blank to solve for it.
L
Temperature after the change, in the unit chosen above. Leave blank to solve for it.
K
Optional. With a constant pressure, use the ideal gas law n = PV/RT to report how many moles of gas the container holds.
Solved value
2
Unknown solvedFinal volume (V₂)
Constant ratio V/T0.003661
Volume change100%
V₁1
V₂2

Final volume (V₂) = 2 L.

  • At constant pressure, volume and absolute temperature rise and fall together: V₁/T₁ = V₂/T₂.
  • The gas expands by about 100% as it is heated.
  • The ratio V/T stays constant for the sample, so both states share the same value of V divided by kelvin T.

Next stepIf the pressure also changes, switch to the combined gas law (P₁V₁/T₁ = P₂V₂/T₂) to account for all three variables.

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