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Gas Moles Calculator

Enter pressure, volume and temperature to find the moles of gas.

How to use

  1. Enter your values in the fields above.
  2. Press Calculate to see your result instantly.
  3. Use the Share button to copy a link to your result.

About this calculator

The ideal gas law, PV = nRT, links pressure (P), volume (V), amount of substance in moles (n), and absolute temperature (T) through the gas constant R (8.314 J/(mol·K), or 0.0821 L·atm/(mol·K) when using liters and atmospheres). Rearranged to n = PV/RT, it lets you compute how many moles of gas are present in a container without ever weighing the sample.

This relationship is a staple of general chemistry and physics coursework and of real lab work — filling gas cylinders, calibrating vacuum systems, or checking stoichiometric yields in a gas-phase reaction. Once you have the mole count, multiplying by Avogadro's number (6.022×10²³) gives the equivalent number of individual gas molecules, which this calculator also reports.

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