The Ideal Gas Law Calculator allows users to compute one unknown variable in the equation PV=nRTPV = nRTPV=nRT if the other quantities are known. Here, PPP is pressure, VVV is volume, nnn is the number of moles, RRR is the gas constant, and TTT is temperature. By rearranging the equation, the calculator can solve for pressure, volume, number of moles, or temperature. This tool is extremely useful in physics and chemistry for analyzing gases, performing lab calculations, and understanding gas behavior under different conditions.