According to Football Bible, the official dimensions for an indoor soccer goal are 6.5 feet high by 12 feet wide. This is half the width of an official outdoor soccer goal.
Soccer goals come in a variety of sizes. According to Edge Sports Center, soccer goals 6.5 by 18.5 feet are used for goalkeeper practice and offensive drills, goals 6.5 by 12 feet are used for indoor gaming and small-side practice, and goals 4 by 6 feet are used for small-side practice.
An official indoor soccer goal is slightly larger than a futsal goal, which measures 6.5 by 10 feet. Indoor goals are considerably smaller than an official outdoor soccer goal, which measures 8 by 24 feet. Youth soccer goal sizes vary greatly without a uniform standard, ranging from 4.5 by 9 feet to 8 by 24 feet.