The Molar Volume Calculator computes the volume occupied by one mole of a gas using either Vm=V/nV_m = V / nVm​=V/n if the volume and moles are known, or Vm=RT/PV_m = RT / PVm​=RT/P from the Ideal Gas Law if only temperature and pressure are known. This tool is useful for chemistry students, laboratory calculations, and understanding the behavior of gases under different conditions. It helps determine the volume that one mole of gas occupies at a given pressure and temperature.