According to FIFA Futsal Laws of the Game 2021/22 the size of an official futsal goal is defined as "The distance (inside measurement) between the posts is 3m and the distance from the lower edge of the crossbar to the ground is 2m. Both goalposts and the crossbar have the same width and depth as the goal lines, 8cm."  This converts to approximately 6'7" high x 9'10" wide. Learn more by reading The Ultimate Guide to Futsal Goal Dimensions 2022.