Local bed voidages have been experimentally determined by means of an optical fiber probe in conical spouted beds of different geometry (angle, inlet diameter) and working under different operating conditions (particle diameter, stagnant bed height, and air velocity). Based on the experimental results, original correlations have been proposed and proven for calculation of bed voidage along the axis of the spout and near the contactor wall. A correlation has been proposed for calculation of bed voidage at any bed position as a function both of bed voidage along the spout axis and at the wall and of the spout radius.