Combined Gas Law

Combined gas law is the combination of Charles’s law, Boyle’s law, and Gay-Lussac’s law. It states that the ratio between the pressure-volume product and temperature is a constant. In this calculator, the initial and final volume, pressure, temperature can be calculated alternatively with the other known values.

Calculator of Combined Gas Law

I want to calculate
Initial Volume(Vi) = L
Initial Pressure(Pi) = kPa
Initial Temperature(Ti) = K
Final Volume(Vf) = L
Final Pressure(Pf) = kPa
Final Temperature(Tf) = K

Formuls of Combined Gas Law

Gas Equation: PiVi/Ti = PfVf/Tf


  • Vi = Initial Volume,
  • Pi = Initial Pressure,
  • Ti = Initial Temperature,
  • Vf = Final Volume,
  • Pf = Final Pressure,
  • Tf = Final Temperature.

Example of Combined Gas Law

If the initial and final volume is 12, 2, initial and final pressure is 10, 7 and initial temperature is 5,

Tf = (Ti x PfVf) / PiVi
= (5 x 7 x 2) / (12 x 10)
= 0.58

Hence, final temperature is 0.58

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