The Avogadro’s Law Calculator computes one unknown variable in the equation V1/n1=V2/n2V₁/n₁ = V₂/n₂V1​/n1​=V2​/n2​, which states that the volume of a gas is directly proportional to the number of moles at constant temperature and pressure. By entering three of the four variables, the calculator determines the missing value. This tool is useful for chemistry and physics students, laboratory calculations, and understanding gas behavior in reactions and processes.