The Henry’s Law Calculator computes the concentration of a gas dissolved in a liquid using Henry’s Law, which states that the solubility of a gas is directly proportional to its partial pressure above the liquid: C=kH⋅PC = k_H \cdot PC=kH​⋅P. By entering the Henry’s law constant and the gas partial pressure, the calculator determines the gas concentration in mol/L and shows the formula substitution. This tool is useful for chemistry students and researchers studying gas solubility, physical chemistry, and applications like carbonated beverages, oxygen transport in blood, and industrial gas absorption.