- Each step in the UK range (6ft, 8ft, 10ft, 12ft, 14ft) adds 61 cm of diameter.
- A 10ft frame takes 7.3 m² of lawn before clearance; a 12ft, 10.5 m².
- Stated user weights seen on the site's listings: 80 to 100 kg at 8ft, up to 150 kg at 10ft and 12ft, 200 kg on one 14ft.
- A 10 x 7ft rectangle needs only 213 cm of width.
What size trampoline fits: the garden arithmetic
Measure the flat part of the lawn at its narrowest, then take away the frame. What is left, split in two, is the room on each side if the trampoline sits in the middle. Compare it with the clearance in the manual of the model you are looking at; that figure, not ours, decides.
| Size | Frame | Frame area | Room each side in a 6 m wide garden |
|---|---|---|---|
| 6ft | 183 cm | 2.6 m² | 208 cm |
| 8ft | 244 cm | 4.7 m² | 178 cm |
| 10ft | 305 cm | 7.3 m² | 147 cm |
| 12ft | 366 cm | 10.5 m² | 117 cm |
| 14ft | 427 cm | 14.3 m² | 86 cm |
| 16ft | 487 cm | 18.6 m² | 56 cm |
Look up as well as across
With the net, the listings we compared stand 231 cm (Monzana 8ft) to 283 cm (Zero Gravity 15 x 10ft) tall. Branches, washing lines and the shed roof count: manuals ask for clear space above the jumper too.
Frame size against the mat you jump on
The size in the title is the frame. Springs and padding take a ring of it, so the mat is smaller, and a few listings say by how much.
| Listing | Frame | Mat (stated) | Difference |
|---|---|---|---|
| Kanga 8ft | 244 cm | 202 cm | 42 cm |
| HyperMotion 10ft | 305 cm | 264 cm | 41 cm |
| Kanga 12ft | 366 cm | 318 cm | 48 cm |
| HyperMotion 16ft | 487 cm | 434 cm | 53 cm |
That is why a jumper on an 8ft frame is never more than about a metre from the edge, and why the net matters more on small frames.
What size trampoline for the people who will jump
Diameter gives room; the stated user weight says who may use it. Choose the weight first, then the smallest frame that carries it and fits the garden.
| Heaviest jumper | Sizes that list it | Examples from our comparisons |
|---|---|---|
| Up to 80 kg | 8ft and up | SONGMICS kids 8ft, Zupapa 8ft |
| Up to 100 kg | 8ft and up | Kanga 8ft, Charles Bentley Monster |
| Up to 150 kg | 10ft and up | SONGMICS, Devoko and PlayActive 10ft |
| Up to 200 kg | 14ft | AWEV 14ft |
One jumper, whatever the size
A bigger frame never means two jumpers. Manuals and RoSPA say one person at a time, and RoSPA adds that children under six should not use full-size trampolines. Our safety guide lists the rest.
Devoko 10ft4.4/5 from 1,000 ratingsSee on Amazon
Three gardens, three answers to what size trampoline
A garden 9 m long and 6 m wide
Length is rarely the limit; width is. A 12ft frame leaves 117 cm each side, a 14ft 86 cm. Check both against the manual and pick the larger one that passes. The 12ft comparison is the place to start.
Two children of 6 and 11
They jump in turns, so the frame does not double. Size for the 11-year-old in three years: a 10ft trampoline rated at 150 kg, like the one in our SONGMICS 10ft review, outlasts an 80 kg 8ft.
A sloping lawn
- Manuals ask for flat, level ground: measure only the level patch.
- If no patch is level, an in-ground trampoline needs a dug pit, drainage and airflow under the mat.
- Do not prop legs on bricks or slabs.
Round or rectangular: what size trampoline in each shape
Rectangular trampolines are sold by width and length. They use a narrow garden better than a round frame of the same length.
| Rectangular size | Frame | Area | Round size it replaces |
|---|---|---|---|
| 10 x 7ft | 305 x 213 cm | 6.5 m² | 10ft round (7.3 m²) in a narrower space |
| 12 x 8ft | 366 x 244 cm | 8.9 m² | 12ft round (10.5 m²) |
| 15 x 10ft | 457 x 305 cm | 13.9 m² | 14ft round (14.3 m²) |
Zero Gravity says its Ultima 5 rectangle is not for the very young but for experienced jumpers. The rectangular comparison sets out the models.
What size trampoline to order, in five steps
- Measure the narrowest width of the level lawn, and look for branches, lines and roofs overhead.
- Take away the frame diameter from the table above and halve what remains.
- Open the manual of the model, or its listing, and compare that room with the clearance it asks for.
- Read the stated user weight and check it covers your heaviest jumper on their own.
- Check the box for anchors, a ladder and a cover; order what is missing with the frame.
If step 3 fails, drop one size and run the sums again: each step down gives back 61 cm of width, about 30 cm on each side.
Where trampoline size choices go wrong
- Measuring the whole garden instead of the flat, open part.
- Reading the jumping mat as the frame: the size in the title is the frame, the mat is smaller.
- Taking the dimension field as gospel: one 10ft listing shows 263 cm, another the 14ft size.
- Sizing up for somersaults: manuals and RoSPA say no somersaults on a garden trampoline.
- Forgetting anchors: wind can move any size, and a bigger net catches more of it.
Ground anchor pack of 44.5/5 from 674 ratingsSee on Amazon
U-shaped ground pegs, 4 pack4.6/5 from 1,000 ratingsSee on AmazonFrequently asked questions
- What size trampoline is best for a small garden?
The largest frame that leaves the manual's clearance on every side. In a 4 m wide space that is usually an 8ft (244 cm), which leaves 78 cm each side when centred.
- How big is a 10ft trampoline?
305 cm across the frame and about 7.3 m² of lawn, before clearance. With the net it stands 240 to 266 cm tall on the listings we compared.
- What size trampoline for adults?
Pick by stated user weight: 150 kg appears from 10ft up, and one 14ft listing (AWEV) states 200 kg. Adults jump one at a time.
- Is 12ft too big for two children?
Not if the garden takes 366 cm plus the manual's clearance. The children still jump one at a time; the extra room is for one jumper.
- Are trampoline sizes the same in feet and centimetres?
The feet are rounded. Listings pair 8ft with 244 cm, 10ft with 305 cm, 12ft with 366 cm and 14ft with 427 cm.
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