The standard US license plate size is 12 inches wide by 6 inches tall (304.8 × 152.4 mm). This size is used for nearly every car, truck, and SUV registered in the United States.
License plate dimensions seem simple until you actually need exact numbers for a frame, a DIY project, or an import vehicle.
Below, we break down every exception, every vehicle type, and every measurement you’ll actually need.
Standard Car License Plate Size in Inches and Millimeters
A standard American license plate measures 12 inches by 6 inches. In metric terms, that’s 304.8 mm by 152.4 mm. The plate itself is typically stamped from aluminum, about 0.032 inches thick, giving it enough rigidity to survive road vibration without warping.
This 2:1 aspect ratio is deliberate. It leaves enough width for six to eight characters plus a state name or slogan, while staying compact enough to fit standard bumper brackets on sedans, trucks, and SUVs alike.
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License Plate Dimensions by Vehicle Type
Motorcycle License Plate Dimensions
The standard motorcycle license plate size in the US is 7 inches by 4 inches (178 mm x 102 mm).
Nearly every state follows this 7×4 measurement, but the bolt hole spacing varies more than you’d expect. Some states space their mounting holes just under 6 inches apart, others closer to 5.75 inches, and a handful use different hole diameters entirely.
Truck and Commercial Vehicle License Plate Dimensions
Trucks, vans, and most commercial vehicles use the same 12 x 6 inch standard as passenger cars. Where things differ is weight classification, not size.
Commercial plates are often tied to a gross vehicle weight rating (GVWR), which affects registration cost and plate wording, not the physical dimensions.
Trailer License Plate Size Requirements
Trailers also typically use the standard 12 x 6 inch plate. However, trailer weight limits matter for registration purposes.
License Plate Frame and Mounting Dimensions
Standard License Plate Frame Size
Most license plate frames are built around a 12.25 inch by 6.25 inch outer dimension, slightly larger than the plate itself so the frame can wrap around the edges without covering any numbers or letters.
Frame thickness typically runs around 0.0625 inches for economy plastic models, with aluminum and billet frames running thicker for durability.
Bolt Hole Spacing and Screw Size Chart
Screw size and hole spacing are where most fitment problems happen. Most states use a quarter-inch (1/4 inch) bolt hole diameter, though a few states, like Connecticut, use an oversized 11/32 inch hole.
Standard hole spacing on car plates generally runs close to 5.75 inches apart horizontally.
For motorcycle plates, spacing is tighter and less consistent, which is exactly why so many riders end up drilling extra holes into new mounting brackets after switching states.
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US License Plate Dimensions vs International Sizes
| Country/Region | Dimensions (inches) | Dimensions (mm) |
|---|---|---|
| United States/Canada | 12 × 6 | 304.8 × 152.4 |
| European Union | 20.5 × 4.3 | 520 × 110 |
| United Kingdom | 20.5 × 4.4 | 520 × 111 |
| Australia | 14.6 × 5.3 | 372 × 134 |
| Japan | 13 × 6.5 | 330 × 165 |
| China | 17.3 × 5.5 | 440 × 140 |
| India | 13.4 × 7.9 | 340 × 200 |
FAQ’s About License Plate Dimensions
What size is a standard license plate in the US?
The standard US license plate size is 12 inches wide by 6 inches tall (304.8 mm x 152.4 mm). This applies to nearly all cars, trucks, and SUVs nationwide.
Are license plate dimensions the same in every state?
Almost. Nearly every state follows the 12 x 6 inch standard, with Maryland as one of the few notable exceptions after its 2008 size adjustment.
What are the dimensions of a motorcycle license plate?
Motorcycle plates measure 7 inches by 4 inches (178 mm x 102 mm) in nearly all US states, though bolt hole spacing can vary by state.
What size screws are used for license plates?
Most states use a 1/4 inch bolt hole diameter, though states like Connecticut use an oversized 11/32 inch hole. Always measure your specific plate before buying hardware.
Do US license plates fit international plate frames?
No. US plates measure 12 x 6 inches, while EU and UK plates use a longer, narrower 520 x 110mm format. A frame built for one will not properly fit the other.
Conclusion
License plate dimensions look simple on the surface, but the details matter once you’re buying a frame, registering a trailer, or importing a vehicle.
The 12 x 6 inch standard covers most of the US, motorcycles follow their own 7 x 4 inch format, and a handful of states and international regions break from the norm entirely. Knowing these exact numbers saves you from returns, mismatched frames, and drilling extra holes you didn’t need to drill.
James Walker is a content researcher and writer specializing in dimensions, measurements, size comparisons, and conversion topics. He creates clear, practical, and easy-to-understand guides that help readers visualize and understand real-world measurements.