How to use the Ideal Gas Law Calculator
Solve for gas volume from pressure, amount of substance, and absolute temperature using PV = nRT. Enter the requested values, review their units, and select Calculate. The result panel shows both the answer and the substituted steps.
The formula
V = nRT ÷ P, where R = 0.082057366 L·atm·mol⁻¹·K⁻¹
Frequently asked questions
Why must temperature be in kelvin?
The ideal gas law requires an absolute temperature scale so zero corresponds to the thermodynamic lower limit.
When is the ideal gas law inaccurate?
Real gases can depart from ideal behavior, especially at high pressure, low temperature, or near a phase transition.
Important notes
Results are estimates based on the values supplied and the formula shown. Round only at the end of a calculation, and verify safety-critical, medical, financial, or construction decisions with an appropriate professional.