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US vs. Canada Plate Size: Same 12 × 6 Inches, With Catches

Sketches of license plates and measuring marks

A standard car plate in the United States and a standard car plate in Canada are the same size: 12 inches wide by 6 inches tall. That is roughly 300 × 150 mm, and it is why a frame or cover made for one country usually bolts onto the other. The real differences show up elsewhere: mounting-hole spacing, motorcycle plates, older plates and the shape of your bumper.

This guide covers the numbers, the history behind them, and the cases where “same size” still doesn’t mean “it fits.”

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TL;DR

  • Passenger-car plates in the US and Canada are both 12 × 6 inches (304.8 × 152.4 mm). Metric sources round that to 300 × 150 mm.
  • The two countries agreed on the size in 1956, so the match is deliberate, not a coincidence.
  • Motorcycle plates are a different, smaller format (7 × 4 inches is typical in the US), with different hole spacing.
  • Fit problems usually come from hole position, frame lips, bolt access and curved bumpers, not from the plate’s outer dimensions.
  • Measure your actual plate before buying any frame or cover.

Table of Contents

The short answer: one rectangle across the border

A US passenger plate is 12 inches wide and 6 inches tall, according to the Texas DMV’s own specification. Alabama’s administrative code lists the same 6 × 12-inch passenger plate. Canada uses the same format: Wikipedia’s entry on Canadian plates gives 12 in × 6 in (300 mm × 150 mm) for the current series.

The metric figure is a rounded nominal. The exact conversion of 12 × 6 inches is 304.8 × 152.4 mm. If you see “300 × 150 mm” on a Canadian listing and “12 × 6 in” on an American one, they describe the same plate.

United States Canada
Standard car plate 12 × 6 in (304.8 × 152.4 mm) 12 × 6 in (about 300 × 150 mm)
Typical hole spacing 7 in between centers 7 in between centers
Motorcycle plate Usually 7 × 4 in Smaller than car plates
Standard set in 1956 1956

The hole spacing row deserves a caveat. The 7-inch figure is the common convention for passenger plates, not a guarantee for every jurisdiction, so we treat it as a starting point and tell you to measure.

Why the two countries match

Before the 1950s, plate sizes varied from state to state and year to year. In 1956, the Canadian provinces and US states agreed on a common size. HowStuffWorks describes the same shift: after 1956, American and Canadian plates measured 6 by 12 inches.

That shared standard is the reason accessory makers sell frames, brackets and covers marketed for “US/CA” plates. It is also why the narrow, boxy look of North American plates is so different from the long, thin European format. Jalopnik’s comparison of European and North American plates explains that European plates follow different standard sizes built around an oblong shape, while American plates are more square.

For comparison, VehiclesDB lists most European plates at 520 × 110 mm, which is more than 20 inches long and only about 4.3 inches tall. A North American cover will not fit that, and a European one will not fit yours.

Proportional comparison of plate dimensions

Where “same size” stops being true

Motorcycles

This is the biggest exception. Motorcycle plates are smaller than car plates, and they don’t follow one national format. Texas specifies 7 × 4 inches, with horizontal hole spacing of 5 13/16 inches and vertical spacing of 2¾ inches. Alabama lists a 4 × 7-inch motorcycle plate, which is the same rectangle turned on its side. Lookupaplate notes that Minnesota is an exception, at 7-3/16 × 4-3/16 inches.

Two things follow:

  1. A frame or cover made for a car plate will not fit a motorcycle plate, and the holes will not line up.
  2. Orientation matters. Some states mount the motorcycle plate with the long edge vertical.

If you ride, our guide to motorcycle plate privacy walks through the four plate types and the fit and legal issues for each.

A product advertised as fitting all “US/CA plates” should be read as fitting standard passenger plates unless it separately confirms motorcycle dimensions. Check the listing before you order.

Hole spacing

Outside dimensions are only half of it. Texas specifies 7 inches between passenger-plate mounting-hole centers and 4¾ inches between vertically aligned hole centers on its passenger, truck, bus and trailer plates. If your car has a different bracket, or a dealer frame that sits between plate and body, the hole position you actually have to work with can change.

We cover the common problems in detail in our piece on 7-inch plate hole spacing and fixes. The short version: if the holes in your plate are the standard 7 inches apart, most universal hardware lines up. If you are bolting through a bracket with odd slots, test-fit before you tighten.

Frames, lips and curved bumpers

A frame that is nominally 12 × 6 inches still has a lip that sits over the plate edge. On a plate with embossed characters close to the border, a deep lip can cover a state name, a slogan or a registration sticker. Some Canadian plates carry provincial names and slogans near the edges, and some US states do the same, so check what your frame hides before you drive.

Then there is the mounting surface. A flat plate on a curved bumper flexes, and a rigid cover on top of it can crack or sit proud at one corner. Plate recesses on some cars are shaped for the plate alone and leave no clearance for a thicker accessory.

Older and vintage plates

If you are restoring a classic, don’t assume. California DMV historical material identifies 12 × 6 inches as the standard for autos starting with the 1956 standardization, and notes that plates before then could differ in length and width. Measure the actual plate.

Can you drive across the border with the other country’s plates?

Plate size has nothing to do with it. A Canadian-registered vehicle can be driven in the US if it is properly registered and the trip is lawful, and the same logic applies in reverse. What border officers look at is registration status, admissibility and paperwork.

Importing is a different matter. The Canada Border Services Agency’s Memorandum D19-12-1 on importing vehicles says the importer is responsible for researching a vehicle’s eligibility before arriving at the border, since not every vehicle bought in the US qualifies. You can’t solve that by swapping a plate onto a car. Registration, provincial requirements and documentation all come first.

So keep two questions apart: “Will this plate or accessory physically mount?” and “Is this vehicle properly registered and permitted here?” This article only answers the first.

A note on the other “US vs. Canada size” question

People who search this topic sometimes want to know which country is bigger. Canada is larger by total area. If you meant license plates, neither country’s standard plate is materially bigger. And the North American tectonic plate, which covers roughly 75.9 million square kilometers according to Los Alamos National Laboratory, is another subject entirely.

How to measure your plate in five minutes

You only need a tape measure and a screwdriver.

  1. Outer size. Measure width and height of the plate. Expect about 12 × 6 inches (304.8 × 152.4 mm) on a car, and a small variation is normal.
  2. Hole centers. Measure from the center of one mounting hole to the center of the other. Standard car plates commonly use 7 inches.
  3. Hole shape. Note whether holes are round or slotted, and whether there are two or four.
  4. Mounting surface. Check whether the bumper or trunk is flat or curved, and whether the plate sits in a recess.
  5. Hardware. Identify the screw or bolt type. Our mounting hardware checklist covers M6, 1/4-inch and No. 14 sizes.

If you want a fuller walkthrough of the numbers, see our guide to U.S. plate cover dimensions.

The general guidance holds for any jurisdiction: treat 12 × 6 inches as a convention, not a law of nature, and measure the plate and mounting area before buying a frame or cover.

Our perspective: fit is a hardware problem, not a country problem

We build plate covers for drivers on both sides of the border, and the thing we hear least is “the plate was the wrong size.” Because US and Canadian car plates share a format, the same cover works on both. What causes returns and frustration elsewhere in this category is almost always the details around the plate: a bracket with odd holes, a recessed mount, a frame the customer forgot was there, or a motorcycle owner who assumed a car product would work.

Our perspective: fit is a hardware problem, not a country problem — overview diagram

That is why we offer two technologies, electric and mechanical, and why we design for standard US and Canadian plates with tool-free, quick installation. A cover has to survive weather, vibration and a car wash, so a sloppy fit isn’t just ugly. It can let water in or work loose. Our advice is boring and reliable: measure first, check the hole spacing, and confirm the product states which vehicles it fits.

We also want you to understand the rules before you install anything. Plate cover laws differ by state and have been changing, and covering a plate can be illegal on public roads in many places. We keep our license plate cover laws guide current for that reason, and we position our products for private property, off-road and motorsport use, where the rules and the stakes are different. If you’ve already had a stop, our guide on what to do after a cover ticket explains the steps.

— GoGhost

A cover built for the 12 × 6 standard

If you’ve confirmed you have a standard 12 × 6 inch car plate, the Ghost Curtain Cover is our mechanical option, priced at $149.99. It uses a manual sliding curtain to hide the plate on demand, and it is built for standard US and Canadian plates with weather-sealed construction and tool-free installation. We ship the same day, and more than 10,000 drivers use our products, with a 4.9-star rating across nearly 3,000 reviews.

Prefer electric? Our electric glass model switches from clear to opaque with a wireless remote. For help choosing, our overview of plate privacy options compares the five main types, and our install guide for U.S. and Canada explains how mechanical and electric covers go on. Electric installs have their own wiring checks, which we cover in the electric cover installation guide. Browse more on the GoGhost blog.

Riding a motorcycle? Confirm the exact cover and your plate’s dimensions on the product page before ordering, because motorcycle plates don’t share the car format.

Quick compatibility checklist

Before you buy any frame, cover or bracket for a US or Canadian plate:

  • Is your vehicle a passenger car or light truck with a standard 12 × 6 inch plate?
  • Are the holes about 7 inches apart center to center?
  • Does the accessory’s lip cover any text, sticker or tab you are required to show?
  • Is the mounting area flat enough, or will the cover rock?
  • Does the listing explicitly state motorcycle, trailer or specialty plate support, if you need it?
  • Do you know your state or province’s rules on covers and frames?

If you can answer yes to the first two and know the answer to the last, you are in good shape.

FAQ

Are US and Canadian license plates the same size?

Yes, for ordinary passenger vehicles. Both use a 12 × 6 inch plate, or about 300 × 150 mm in metric terms. The two countries agreed on the format in 1956, though individual jurisdictions can vary slightly, so measure before buying accessories.

Will a US license plate frame fit a Canadian plate?

Usually, yes, because the outer dimensions match. Problems come from hole position and from frame lips that cover provincial names or stickers. Check that the frame leaves required information visible and that the screw holes line up with your bracket.

How big is a motorcycle license plate in the US?

Typically 7 × 4 inches, though states differ. Texas lists 7 × 4 inches, Alabama lists a 4 × 7-inch plate, and Minnesota is slightly larger. Motorcycle holes are also spaced differently from car holes, so a car frame or cover won’t fit.

Can I drive in the US with a Canadian plate?

Yes, if the vehicle is properly registered and the trip is lawful. Plate size doesn’t decide that. Importing a vehicle into Canada is a separate process with its own eligibility, registration and documentation rules, set out in CBSA guidance.

Sources