The Percent Yield Calculator is an essential chemistry tool used to measure the efficiency of a chemical reaction. By comparing the actual yield obtained in an experiment to the theoretical yield predicted by stoichiometry, this calculator quickly determines how successful a reaction was. It helps students, teachers, and laboratory chemists understand reaction performance, identify errors, and optimize experimental procedures. A high percent yield indicates a more efficient reaction, while a low yield suggests incomplete reactions or product loss. Use this simple and accurate calculator to save time and improve precision in your chemistry calculations.