What is the Standard Crib Mattress Size?

Not sure what size mattress to buy for your baby’s crib? Check out our guide to the standard crib mattress size and find the perfect fit for your little one.

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Standard Crib Mattress Size

Most cribs use a standard crib mattress size, which is 27.5 inches wide by 51.6 inches long. This size is also sometimes referred to as a “mini” or “playard” mattress. There are a few other mattress sizes that are occasionally used in cribs, but the standard size is by far the most common.

Standard crib mattress size in the United States

The standard crib mattress size in the United States is 27 1/4 inches by 51 5/8 inches. This is the size for all baby cribs sold in the US, and it is also the size for all mini and portable cribs. The mattress should be no thicker than 6 inches, and it should have a firm surface to support your baby’s developing spine.

Standard crib mattress size in Canada

The standard crib mattress size in Canada is 27.5 inches by 51.6 inches. This is the same size as a regular twin mattress, which makes it easy to find sheets and other bedding that will fit your crib mattress. The standard crib mattress size in the United States is slightly smaller, at 27 inches by 52 inches, so be sure to check the dimensions of your mattress before you buy any bedding.

Standard crib mattress size in Europe

The standard crib mattress size in Europe is 60 x 120 cm. This size is also known as a “cot mattress”. Most European countries use this size for their cribs, although there are some regional variations. For example, in the UK the standard size is slightly larger at 70 x 140 cm.

Crib mattresses in Europe are usually made from firm foam or firm springs, with a layer of softer material on top for comfort. The mattress should be firm so that it is safe for your baby to sleep on and so that they don’t sink down into the mattress and suffocate.

If you are buying a crib mattress in Europe, make sure that you measure your crib to check that the mattress will fit. You should also check the thickness of the mattress to make sure that it meets safety standards. The thickness of a standard crib mattress should be at least 10 cm.

Crib Mattress Dimensions

Most crib mattresses have dimensions of about 51.6 cm x 27.9 cm, which is about 20.9 inches by 11 inches. This size is generally large enough for most cribs, but make sure to double check the dimensions of your crib before purchasing a mattress. Some people prefer to get a mattress that is a little larger so that their baby has more room to move around.


The average length of a crib mattress is about 28 inches, which is about 2 feet, 4 inches. However, the standard size for a crib mattress is actually 27 1/4 inches by 51 5/8 inches. That’s about 2 feet, 3 1/4 inches by 4 feet, 3 5/8 inches.


The width of a crib mattress is typically 28 to 30 inches, which is just over two feet. This mattress size is standardized so that all cribs will accommodate the same width, regardless of the brand or style. The width of the mattress should be snug against the sides of the crib so that there is no gap where your baby could become stuck.


The standard crib mattress is six inches thick, although some mattresses are as thick as eight inches. The thickness of the mattress is a personal preference, but keep in mind that a thicker mattress will be more expensive and may not fit in all cribs. Some parents prefer a thicker mattress for their baby’s comfort, while others find that a thinner mattress is just as comfortable and easier to move around.

The height of the average cribMattressis approximately 28 inches, although some brands may be slightly taller or shorter. The height of the mattress is important because you want to make sure that your baby can not climb out of the crib. A taller mattress may be more difficult to get in and out of the crib, but it will provide a barrier between your baby and the floor.

Mattress Types

The Standard Crib Mattress Size is the most common size for cribs. This size is 27.5 inches by 51.6 inches. It is important to know the standard crib mattress size when you are shopping for a crib mattress. There are other sizes of crib mattresses, but the Standard Crib Mattress Size is the most common.


Innerspring mattresses are the oldest and most common type of mattress. They consist of a steel coil support system with layers of padding on top. The number of coils and the gauge (thickness) of the wire varies by manufacturer and model, but most have between 300 and 850 coils. The amount of padding also varies, but most innerspring mattresses have at least two different types of padding, including a layer of cotton batting or fiberfill.


Foam mattresses are a type of mattress that is made from foam, rather than springs. They can be made from a variety of different materials, including memory foam, latex foam, and polyurethane foam. Foam mattresses are often considered to be more comfortable than spring mattresses, as they contour to the body and provide pressure relief. However, they can also be more expensive.


Organic mattresses are made with certified organic materials, such as cotton and wool, that have been grown without the use of pesticides or other chemicals. These mattresses are often more expensive than non-organic options, but they may be a good choice for people who are looking for an eco-friendly option.