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Ideal Gas Law Calculator — PV = nRT Solver

Enter any three of pressure, volume, amount of substance and temperature, and this calculator solves the ideal gas law PV = nRT for the fourth. It handles common unit combinations and shows the rearranged equation so you can check the working.

How to use Gas Laws

1. Choose which quantity you want to solve for.
2. Enter the three known values with their units.
3. Read the result and the rearranged formula.

Frequently asked questions

What is the ideal gas constant R?

R = 8.314 J/(mol·K) in SI units, or 0.08206 L·atm/(mol·K) when using litres and atmospheres.

When does the ideal gas law break down?

At high pressure and low temperature, where molecular volume and intermolecular forces matter. Real gas equations such as van der Waals fit better there.

Must temperature be in Kelvin?

Yes — the law requires absolute temperature. Enter Celsius and the calculator converts it for you.

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