This Stoichiometry Calculator determines the mass of a product formed in a chemical reaction by using the mass of the reactant, the molar masses of the reactant and the product, and the stoichiometric coefficient ratio between them. When the user inputs the mass of the reactant, its molar mass, the product’s molar mass, and the stoichiometric ratio, the calculator first computes the number of moles of the reactant by dividing its mass by its molar mass. Then, it multiplies the moles of the reactant by the product’s molar mass and the stoichiometric ratio to determine the theoretical mass of the product. This allows users to quickly and accurately predict how much product can be obtained from a given amount of reactant, making it a practical tool for laboratory calculations and reaction planning.