https://www.gettrampoline.com/trampoline-articles/trampoline-prices-trampoline-sizes-guide/
The Trampoline Sizes Guide: Standard and Average Size Trampolines | GetTrampoline.com
May 6, 2019 - Typical trampoline size will be around 14 feet in diameter. The best size trampoline for 9 year old is 12ft. Find out the best trampoline size for you here.
sizes guidetrampolinestandard