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K and Q are calculated in the same way, except that K uses the values from equilibrium and Q uses initial conditions/conditions not at equilibrium. You can use the value of Q to determine which way the the reaction will proceed to reach equilibrium!
Q is the reaction quotient, whereas K is the equilibrium constant. While they are both ratios of product to reactant, K represents the ratio when the reaction is at equilibrium, or when the forward rate of the reaction is equal to the reverse rate (products are being formed at the same rate as reactants). On the other hand, Q is simply the ratio of product to reactant at any given time during the reaction.