Ideal Gas Law Calculator

Enter value and click on calculate. Result will be displayed.

Formula:
V = nRT / P

Select your field :
 
Temperature (T) :
K
Pressure (P) :
kPa
Moles Of Gas (n) :
moles
Result:

What is the Ideal Gas Law?
The Ideal Gas Law is a fundamental equation in chemistry and physics that describes the relationship between pressure, volume, temperature, and the amount of gas in a system. The equation is:

PV = nRT

where:

  • P = Pressure (in atmospheres, pascals, etc.)
  • V = Volume (liters, cubic meters, etc.)
  • n = Amount of gas (in moles)
  • R = Universal gas constant (8.314 J/mol.K or 0.0821 L.atm/mol.K, depending on units)
  • T = Temperature (in kelvin)

Why use the Ideal Gas Law?

  • Predicting gas behavior: It’s a simple model that approximates how gases behave under different conditions of pressure, volume, and temperature.
  • Solving for unknowns: You can calculate any one of the variables (P, V, n, T) if you know the others.
  • Engineering and science applications: It’s essential for fields like chemistry, physics, and environmental science when working with gases.

How does an Ideal Gas Law calculator work?
An Ideal Gas Law calculator automates the equation PV = nRT. You input the known values, and the calculator solves for the missing one.

For example:

  • If you know pressure, volume, temperature, and the gas constant, it calculates the number of moles of gas.
  • If you know moles, volume, temperature, and the gas constant, it finds the pressure.

When to use an Ideal Gas Law calculator:

  • Lab experiments: Determining the number of moles of a gas from pressure, volume, and temperature.
  • Engineering designs: Calculating gas behavior in piping, HVAC systems, and pressurized containers.
  • Weather and atmosphere studies: Estimating atmospheric pressure and gas expansion at different altitudes.