Trampoline Safety Zone Calculator
Trampoline clear area with solo, age, pad, and level verdicts.
What it does
Trampolines injure on bad setups more than bad luck: one jumper at a time over 6, pads over springs, level ground with 6 ft clear all around and open sky. Nets stop falls off, never injuries on.
The tool above takes mat size with age, count, pads, and level. It returns the clear footprint with area and a pass or fail verdict.
The default 14 ft round needs 26 x 26 ft (676 sq ft) and passes solo at 7 with pads. Two jumpers fail on any mat; a 10 x 14 rectangle needs 22 x 26.
Spacing follows CPSC playground guidance with AAP safety policy and ASTM home specs behind them. All three agree on solo use and under-6 limits used here.
How to use
- Pick round or rectangle.
- Enter mat size.
- Enter jumper age.
- Enter jumper count.
- Flag pads and level ground.
- Read footprint, then verdict.
Formula
- size
- Mat diameter or length in feet.
- width
- Second side for rectangles.
- zone
- 6 ft clear each side.
Rectangles add 12 ft to each side separately. Exact 6 ft clearances pass; less fails. Slope, wind, wet mats, ladders left down, and damaged nets fail regardless of space.
Worked example
Example: 14 ft backyard trampoline
Defaults: 14 ft round, age 7, solo, pads, level.
- Round mat: 14 ft diameter.
- Zone: 6 ft each side.
- Footprint: 14 + 12 = 26 ft square.
- Area: 26 x 26 = 676 sq ft.
- Checks: 1 jumper, age 7, pads on, level.
- Overhead: open sky, no wires.
- Tool shows 26 x 26 ft clear, 676 sq ft, pass.
Reference table
| Rule | Figure | Note |
|---|---|---|
| Side clearance | 6 ft | Each side |
| Jumpers | 1 | Always solo |
| Minimum age | 6 | Full size |
| Overhead | Open sky | No wires |
Limits
- Setup screening only, not coaching.
- Mats and nets wear out.
- Weather changes traction.
- Home specs assume solo use.
Common mistakes
- Doubling up jumpers.
- Skipping pads over springs.
- Sloped or wired sites.
- Under-6s on full size.
- Flips and somersaults.
Try it yourself
Quick checks. Answers sit tucked under each question.
Same setup, 2 jumpers?
Fail: 1 at a time on every mat.
10 x 14 ft rectangle?
(10+12) x (14+12) = 22 x 26 ft, 572 sq ft.
Age 5 solo with pads?
Fail: under 6 barred from full size even with nets.
Questions
How much yard does a trampoline need?
Mat plus 6 ft each side: a 14 ft round needs 26 x 26 ft clear and level.
How many jumpers at once?
One at a time, always. Extra jumpers multiply collision injuries.
Can small kids bounce?
None on full size under 6. Nets never fix mat injuries or flips.
What makes a site pass?
Level ground, open sky, no wires or branches, pads covering springs, intact net.
What rules govern use?
Yes: adult supervision, no somersaults or flips, inspect pads and net often.
Do specs allow doubling up?
No: ASTM home specs assume single users, and under-6 stays off full size.