The Reaction Quotient (Q) Calculator helps determine the reaction quotient for any chemical equilibrium system using the formula Q = [products] / [reactants]. By entering the concentrations or partial pressures of the reactants and products, the calculator computes the value of Q, which indicates the direction in which a reaction will proceed to reach equilibrium. If Q is less than K, the reaction will move forward toward the formation of products; if Q is greater than K, the reaction will shift backward toward the reactants; and if Q equals K, the system is already at equilibrium. This tool is especially useful in predicting the behavior of reversible reactions under different concentration conditions in chemistry.