Number plate spacing rules (UK)
UK number plates have strict, legally defined character sizes, spacing and margins. Get them right and your plate is readable and road legal; get them wrong and it can fail an MOT.
The layout of a UK plate isn't a matter of taste — the character size and spacing are set out in law so registrations are easy to read and recognise. Squeezing characters together, spreading them out, or shifting spaces to "spell" something is illegal. Here are the dimensions a standard car plate must use.
The legal character dimensions
For most cars and light vehicles, road-legal plates use the following measurements:
| Element | Measurement |
|---|---|
| Character height | 79mm |
| Character width (except 1 and I) | 50mm |
| Character stroke (thickness) | 11mm |
| Space between characters | 11mm |
| Space between groups | 33mm |
| Top, bottom and side margins (minimum) | 11mm |
The number 1 and the letter I are narrower than 50mm because of their shape, but every other character follows the width above. The registration is split into two groups, and the 33mm gap between those groups is wider than the 11mm gap between individual characters.
Why correct spacing matters
The whole point of these rules is legibility and consistency. A plate must show your registration exactly as issued, with no creative spacing. Misrepresenting a registration — for example by moving spaces, altering gaps, or using bolts and fixings to make a character look like a different one — is illegal.
Illegal spacing and the MOT
Number plates are checked as part of the MOT test. A plate that doesn't display the registration correctly — including incorrect character spacing or a registration that can't be properly read — can result in an MOT failure. Beyond the MOT, incorrectly displayed plates can attract a fine and, in some cases, the registration can be withdrawn. It simply isn't worth the risk.
- Never move spaces to make the plate spell a word or name.
- Keep the 11mm character gap and the wider 33mm group gap.
- Don't use screws or fixings to alter how a character looks.
How we get spacing right
When you build your plate and choose a road-legal option, the layout uses the legal character sizes and spacing automatically, so you don't have to measure anything. If you want custom spacing for display purposes only, that can be supplied as a show plate — but a show plate can never be used on the road. See our show plates page and our road-legal number plates page for the difference.
Common questions
Can I space my plate to read like a name?
No. Altering the spacing to make the registration appear to spell a word or name is illegal and can fail an MOT or lead to the registration being withdrawn.
Why are the 1 and I narrower?
Because of their shape, the digit 1 and the letter I use a narrower width than the standard 50mm. Every other character keeps the full width.
Do motorbikes use the same spacing?
No. Motorcycle plates have their own character sizes and are typically laid out over two rows, so always use a plate made for your vehicle type.
Get the spacing right, automatically
Build a road-legal plate with the correct legal character sizes and spacing built in — with free UK delivery.