Key points
- Standard UK plate: 520mm x 111mm (20.5 x 4.4 inches) front and rear on most cars and vans
- No plate size is fixed in law; character size, spacing and an 11mm margin are
- Oversized rear plates are 533mm x 152mm (21 x 6 inches)
- Square 4x4 plates are about 279 to 285mm x 203mm (11 x 8 inches)
- Import plates for US and Japanese recesses are 305mm x 152mm (12 x 6 inches)
- Motorbike plates are 229mm x 178mm (9 x 7 inches) and fitted at the rear only
- A seven character car registration needs at least about 460 x 101mm on one line or 255 x 199mm on two
- Front and rear plates can be different sizes but must show the same registration
UK Number Plate Sizes and Dimensions
UK number plate sizes are not fixed by law. What the law fixes is the size of the characters, the gaps between them and an 11mm margin around them, so a plate has to be big enough to hold your registration with all three. Suppliers make a set of standard sizes that fit almost every vehicle, and the right one depends on the recess or bracket on your car or bike. Find your size below, then choose your layout in the number plate builder.
Standard UK Number Plate Sizes
The standard number plate size for most cars and vans is 520mm x 111mm. The other common sizes cover square recesses, larger rear panels, imports and motorbikes.
Plate | Size in mm | Inches | Typical use |
|---|---|---|---|
Standard oblong | 520 x 111 | 20.5 x 4.4 | Front and rear of most cars and vans |
Oversized oblong | 533 x 152 | 21 x 6 | Rear of some 4x4s and larger vehicles |
Square (two line) | 279 to 285 x 203 | 11 to 11.25 x 8 | Rear of many 4x4s and some imports |
Import | 305 x 152 | 12 x 6 | US and Japanese vehicles with a smaller recess |
Motorcycle (two line) | 229 x 178 | 9 x 7 | Rear of motorbikes first registered from 1 September 2001 |
Short oblong | Shorter length x 111 | Varies | Short registrations in a narrow recess |
Square plates are cut at slightly different widths by different suppliers, so measure your recess before ordering.
The Legal Minimum Number Plate Dimensions
Because characters are 79mm tall and 50mm wide on cars, with fixed gaps and margins, every registration has a minimum plate size. For a current seven character registration such as AB12 CDE:
Layout | Minimum width | Minimum height |
|---|---|---|
Car, one line | About 460mm | 101mm |
Car, two lines | About 255mm | 199mm |
Motorbike, two lines with 64mm characters | About 228mm | About 163mm |
These figures are worked out from the measurements in the display regulations. The full breakdown is in number plate spacing rules. Anything smaller cannot carry a full registration legally, which is why mini plates are sold only as show plates.
Number Plate Size by Vehicle
Cars and vans: a 520mm x 111mm oblong front and rear on most models. Order a single front plate or single rear plate if only one side needs replacing
4x4s and SUVs: often an oblong front with a square or oversized rear. See oversized and 4x4 plates
Motorbikes: one 9 x 7 inch rear plate on two lines. See motorbike number plates
Imports: a 305mm x 152mm recess is common on US and Japanese vehicles. See import number plates
Short registrations: a shorter oblong with full size characters. See short number plates
Trailers: the towing vehicle's registration on a rear plate, covered under trailer number plates
Plate sizes also vary by make and model. Our manufacturer plate fitments guide lists the usual size and fixing for each major brand.
How to Measure for the Right Plate Size
Measure the old plate. Measure the width and height of the plate you are replacing in millimetres, edge to edge.
Check the recess or bracket. Measure the flat area the plate sits on. The new plate must fit without overhanging, being cut or covering lights or sensors.
Allow room for a flag. A flag and identifier band adds up to 50mm on the left, so a plate with a flag needs more length than one without.
Match the layout. Choose one line or two lines to suit the shape of the recess, then pick the matching size in the builder.
Oblong or Square on a 4x4
Many 4x4s and SUVs have a deep rear panel that takes either a square plate or an oversized oblong. Fit the shape the recess was designed for: a square plate in a wide oblong recess leaves the fixing holes exposed, and an oblong in a square recess can overhang or sit at an angle. If the old plate fitted well, match its size exactly; if it was the wrong shape, measure the recess itself and choose from that.
Sizes Do Not Change the Rules
Whatever size you choose, characters stay at full height with fixed gaps and an 11mm margin. You cannot trim a standard plate to fit, squeeze characters onto a smaller plate, or tilt a plate to make it fit a recess. Plates should be fitted vertically or as close to vertical as the vehicle allows, as covered in how to fit number plates.
Frequently asked questions
What is the standard UK number plate size?
The standard oblong plate is 520mm x 111mm (20.5 x 4.4 inches), used front and rear on most cars and vans.
Is there a legal number plate size?
No single size is set in law. The law fixes character size, spacing and an 11mm margin, so the plate must be large enough to hold the registration with all three.
What size is a square number plate?
Square two line plates are usually about 279mm to 285mm wide and 203mm tall (around 11 x 8 inches), common on the rear of 4x4s.
What size is a motorbike number plate?
The usual motorbike plate is 229mm x 178mm (9 x 7 inches), a two line rear plate with 64mm characters.
Can I get a smaller number plate for my car?
Only if your registration still fits with full size characters, legal gaps and margins. A shorter registration can use a shorter plate; a full seven character registration needs about 460mm on one line.
Do front and rear plates have to be the same size?
No. Many vehicles use an oblong front plate and a square or oversized rear plate. Both must show the same registration.