The number of children that can fit in a 10x10 bounce house can vary depending on the design and specifications of the specific bounce house. However, as a general rule of thumb, a 10x10 bounce house can typically hold around 8-12 children at a time, with a maximum weight limit of around 800-1000 pounds. It's important to note that the number of children and the weight limit should always be checked with the manufacturer or rental company before using the bounce house. It's also important to follow the safety guidelines and supervise the children when they are using the bounce house.