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Ideal Gas Law Calculator

This Ideal Gas Law Calculator helps determine the relationship between pressure, volume, temperature, and the number of moles of a gas. It’s useful for students, chemists, and engineers to solve thermodynamic problems involving gases under ideal conditions. Simply enter the known variables to calculate the unknown using the equation PV = nRT.

Ideal Gas Law Calculator

Input Fields
T
K
P
kPa
n
mol
If enabled, the result will update automatically when you change any value.

Ideal Gas Law Formula

Formula
$$PV = nRT$$

Where:

  • $$P$$ = Pressure (Pa, atm, etc.)
  • $$V$$ = Volume (L, m³, etc.)
  • $$n$$ = Number of moles
  • $$R$$ = Ideal Gas Constant (8.314 J/mol·K)
  • $$T$$ = Temperature (K)

This formula expresses the state of an ideal gas by linking its pressure, volume, temperature, and amount of substance.


The Ideal Gas Law is a fundamental equation in chemistry and physics that applies to ideal gases. It combines several simpler gas laws (Boyle’s, Charles’s, and Avogadro’s laws) into one equation. Use this calculator to solve for any variable (P, V, n, or T) when the others are known. Common in laboratory work and educational contexts, it assumes ideal behavior which is most accurate under low pressure and high temperature

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