The Dalton’s Law Calculator computes the total pressure of a gas mixture by summing the partial pressures of all individual gases in the mixture, according to Dalton’s Law: Ptotal=P1+P2+P3+…P_\text{total} = P_1 + P_2 + P_3 + \dotsPtotal​=P1​+P2​+P3​+…. Users input all the partial pressures separated by commas, and the calculator adds them to give the total pressure of the system, also showing the substitution formula. This is useful in chemistry and gas law problems involving mixtures of ideal gases, helping students quickly determine total pressure in a mixture.