Trampoline size is probably one of the most essential things to consider when investing. If you're looking for a small trampoline for a toddler, be aware that it will need replacing when they grow out of it (and you know they will!).
While if you want one that will stay with you for years to come, and if your child is over 6 years old (usually the minimum age requirement for bigger models) it might be worth investing a little more to increase its longevity.
If you have a small to medium size garden (and small children) six to 10 feet is plenty big enough for them to use until they are about 10 years old. Teens and adults will need at least 12 feet diameter to bounce safely with the exuberance that older kids are likely to exhibit.
We've included a variety of sizes above, from 3ft upwards, but many of the models we've featured are available to order in bigger sizes too if you have the space available in your family garden.