At PAO Zaporozhkoks, the coke yield is determined experimentally as a function of the batch properties and the final coking temperature, in box coking. An empirical formula for the coke yield is obtained. With increase in the yield of volatiles from dry batch by 1%, the coke yield falls by 0.71%. With increase in the final coking temperature by 50(circle)C, the coke yield falls by 0.35%.