Trampoline size calculator

The most common mistake when buying a trampoline is choosing one that's too big for the garden, because it also needs clear space all round. Enter the size of your clear area and we'll show the largest trampoline that fits with a safe margin.

This calculator uses general guidance: at least two metres (about 6.5 ft) clear on every side and five metres (about 16 ft) of clear height above, with no branches, cables or roofs. Enter the length and width of the clear area in feet or metres, and we subtract the safety margin and show the largest outer footprint that fits. Rectangular models may be turned to fit best.

Below the result you'll see which sizes and models in our range fit, each linking to its product page where you can compare prices. We use the outer dimensions stated by manufacturers; models with unknown dimensions are left out. The guidance never replaces the manufacturer's manual, which may ask for more room. Measure twice and allow for any slope.

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Frequently asked questions

How much space does a trampoline need?

As general guidance, at least two metres (6.5 ft) clear all round and five metres (16 ft) of clear height. A 12 ft trampoline therefore needs roughly 25 × 25 ft. Always follow the manufacturer's manual.

Is the net included in the dimensions?

We use the outer dimensions the manufacturer states, which normally include the frame. The safety margin is added outside that.

Can I put the trampoline closer to a fence?

We don't recommend it. The clearance is there to reduce the risk of hitting obstacles after a fall or an off-centre bounce.

Why aren't all models shown?

Models with unknown outer dimensions are not shown, because we can't check that they fit.

Updated 29 September 2026 · Find My Trampoline editorial team