A trampoline needs much more room than its frame. Most trampoline injuries come from falls off the mat, collisions or landing on something hard, so a clear zone around it matters as much as the net. This calculator adds that zone and checks the fit in your yard.
How much clear space?
Manufacturers and safety organizations commonly recommend:
- about 7 to 8 ft of clear space on every side, free of fences, walls, trees, play equipment and patios;
- about 24 ft of overhead clearance, with no branches or power lines above;
- a level, soft surface such as grass or bark mulch, never concrete or decking.
With an enclosure net, the zone can sometimes be a little smaller, but keep at least several feet so the net does not throw a jumper into an obstacle.
The calculation
For a round trampoline:
zone diameter = trampoline diameter + 2 × clearance
A 14 ft trampoline with 8 ft on every side needs a 30 ft circle, about 707 sq ft. The calculator then checks that the zone fits within your yard’s length and width.
For a rectangular trampoline, the zone is (length + 2 × clearance) × (width + 2 × clearance).
Choosing a size
| Diameter | Typical use |
|---|---|
| 8 to 10 ft | small yards, young children |
| 12 ft | the most common family size |
| 14 to 15 ft | older children and teens |
| 16 ft or rectangular | experienced jumpers, more bounce |
Rectangular trampolines give a more even bounce and are used for gymnastics; round ones direct jumpers back toward the center.
Safety rules that matter most
- One jumper at a time. Most serious injuries happen with several people on the mat, especially when a smaller child is bounced by a heavier one.
- Use an enclosure net and frame padding, and check them each season.
- No flips or somersaults without training.
- Children under 6 should not use full-size trampolines, according to many pediatric guidelines.
- Supervise children at all times and remove the ladder after use.
- In windy areas, anchor the frame with a tie-down kit; trampolines can blow over in storms.
Homeowner’s insurance
Some insurers exclude trampoline injuries or require nets and fencing. Check your policy before installing one, and let guests’ parents know the house rules.