The Boyle’s Law Calculator computes the unknown variable in the equation P1V1=P2V2P₁V₁ = P₂V₂P1​V1​=P2​V2​, which describes the inverse relationship between pressure and volume of a gas at constant temperature. By providing three of the four variables (initial and final pressure and volume), the calculator can determine the missing value. This tool is useful for physics and chemistry students, as well as in laboratory and engineering applications to analyze gas compression and expansion under constant temperature conditions.