Mattress Sizes, Dimensions, and Bed Sizes Guide | Gotta Sleep

Mattress Measurements and Bed Sizes 

Looking for mattress sizes?  This article will help you find the right dimensions for your mattress.  Beds come in many sizes, from the small single Twin, queen size and go all the way to the massive California King.  Unfortunately, manufacturing procedures, padding and types of support can all alter the size.

IMPORTANT: This guide offers the most common sizes. It is important to know that there are no legal standard mattress dimensions.  As a result, if you are looking for a specific bed size in Canada or the USA, be sure to ask your vendor for exact measurements if you are unclear.   

In Canada and the USA, we use terms like Queen, King, Double and so on to define mattress sizes. In other places, like various European countries, the language can be different, and the same name could apply to a very different size. So be on the lookout if your set isn't from North America!

If you are looking for a quality graphite and gel cooling mattress with plant-based foams and a 10 year Warranty & 101 Night Trial, we have a grand opening sale on The OMG Mattress.  Use discount code: 50OFFANOMG for $50 off The OMG Mattress.

The commonly manufactured sizes in Canada and the USA are:

Here is our

When the coils in spring or coil mattresses are made the count and thickness of the wire varies. This can greatly affect the width and length of coil mattresses. Because of this in Canada and the USA, manufacturers must produce inner-spring or coil mattresses within 1” of what they have indicated in their marketing.

Foam mattresses are cut from slabs of foam, so their sizes don't vary as much.  As a result, you don’t have to worry about size variations with foam mattresses. They are the exact size they state on the label and description.  

When buying mattresses online, like bed in a box, they’re usually foam mattresses. Some of them also contain coil inner springs, so it’s good to check.

Foam Mattresses

Foam Mattress Sizes | Bed Measurements

Bed Width and Length*
(Bed sizes in Inches)
*+/- 1"
Bed Width and Length*
(Bed sizes in cm)
*+/- 2.5 cm
Size we carry: Suitable for:
Crib 28" x 51" 71.1 cm x 129.5 cm N/A Babies or an infant.
Small Single or Cot 30" x 75" 76.2 cm x 191 cm N/A A toddler which has outgrown a crib.
Twin or Single 39" × 75" 99 cm × 191 cm 39" x 74.5" Kids who have outgrown their crib or an adult living in a smaller room. It can also be used for a bunk bed.
Twin XL, Single XL, or TXL 39" × 80" 99 cm × 203 cm 39" x 79.5" Kids or taller adults who need an extra five inches compared to a Twin or Single.
Super Single or Three-quarters (3/4) 48" × 75" 122 cm × 191 cm N/A Kids or adults who prefer a little extra width in exchange for less height.
Full or Double 54" × 75" 137 cm × 191 cm 54" x 74.5" Good for a single sleeper or someone with children or pets. Can be used for a couple who do not require much leg room.
Full XL or Double XL 53" × 80" 135 cm × 203 cm N/A Plentiful for a single sleeper and ideal for couples who need extra leg room, but don't have room for a queen size bed.
Queen RV (common in recreational vehicles) 60" x 75" 152.5 cm x 190.5 cm 60" x 74.5" A bed for a a couple in a recreational vehicle (RV).
Queen 60" × 80" 152 cm × 203 cm 60" x 79.5" Most commonly purchased mattress size as it is the perfect size for most couples and provides plenty of room for single sleepers.
Olympic Queen 66" x 80" 168 cm x 203 cm N/A The next size larger than the queen for couples before they get a King.
California queen waterbed insert 58" × 82" 147 cm × 208 cm N/A Couples looking for a california queen size water bed.
King 76" × 80" 193 cm × 203 cm 76" x 79.5" Great choice for couples who want plenty of room and personal sleeping space. Be sure to check your room to ensure it will fit in your bedroom.
California King - Waterbed Insert 70" × 82" 178 cm × 208 cm N/A 2 inches longer but 6 inches narrower than a standard king. Good for taller individuals in the market for a waterbed.
California King 72" × 84" 183 cm × 213 cm 72" x 83.5" 4 inches longer but 4 inches narrower than a king sized bed. Great for taller individuals.
Texas (or athletic) King 80" × 98" 203 cm × 249 cm N/A People in the market for the maximum standard size of bed that money can buy with an equally large room.

At Gotta Sleep we offer the 7 most popular sizes of foam mattresses. Less popular sizes need to be custom modified, which makes them more expensive.  Our mattresses are all shortened intentionally by 1/2" to give the best fit for sheets without scraping your hands between the mattress and the bed frame.  Our mattresses also fit into tight bed frames, so it doesn't creak every time you lay down or move around. Don't worry, the half inch or 2 cm won't be noticeable while you sleep!

Coil Inner-Spring Mattresses / Spring Mattresses

Coil Inner Spring Mattress Sizes | Bed Sizes

Bed Width and Length*
(Bed sizes in Inches)
*+/- 2"
Bed Width and Length*
(Bed sizes in cm)
*+/- 5 cm
Size we carry: Suitable for:
Crib 28" x 51" 71.1 cm x 129.5 cm N/A Babies or an infant.
Small Single or Cot 30" x 75" 76.2 cm x 191 cm N/A A toddler which has outgrown a crib.
Twin or Single 39" × 75" 99 cm × 191 cm 39" x 74.5" Kids who have outgrown their crib or an adult living in a smaller room. It can also be used for a bunk bed.
Twin XL, Single XL, or TXL 39" × 80" 99 cm × 203 cm 39" x 79.5" Kids or taller adults who need an extra five inches compared to a Twin or Single.
Super Single or Three-quarters (3/4) 48" × 75" 122 cm × 191 cm N/A Kids or adults who prefer a little extra width in exchange for less height.
Full or Double 54" × 75" 137 cm × 191 cm 54" x 74.5" Good for a single sleeper or someone with children or pets. Can be used for a couple who do not require much leg room.
Full XL or Double XL 53" × 80" 135 cm × 203 cm N/A Plentiful for a single sleeper and ideal for couples who need extra leg room, but don't have room for a queen size bed.
Queen RV (common in recreational vehicles) 60" x 75" 152.5 cm x 190.5 cm 60" x 74.5" A bed for a a couple in a recreational vehicle (RV).
Queen 60" × 80" 152 cm × 203 cm 60" x 79.5" Most commonly purchased mattress size as it is the perfect size for most couples and provides plenty of room for single sleepers.
Olympic Queen 66" x 80" 168 cm x 203 cm N/A The next size larger than the queen for couples before they get a King.
California queen waterbed insert 58" × 82" 147 cm × 208 cm N/A Couples looking for a california queen size water bed.
King 76" × 80" 193 cm × 203 cm 76" x 79.5" Great choice for couples who want plenty of room and personal sleeping space. Be sure to check your room to ensure it will fit in your bedroom.
California King - Waterbed Insert 70" × 82" 178 cm × 208 cm N/A 2 inches longer but 6 inches narrower than a standard king. Good for taller individuals in the market for a waterbed.
California King 72" × 84" 183 cm × 213 cm 72" x 83.5" 4 inches longer but 4 inches narrower than a king sized bed. Great for taller individuals.
Texas (or athletic) King 80" × 98" 203 cm × 249 cm N/A People in the market for the maximum standard size of bed that money can buy with an equally large room.

The sizes between coil and foam mattresses vary a bit, but there's a very good reason! Innerspring coil mattresses are much harder and don't squish around like foam mattresses do. As a result, and to make it easier to fit into frames and tuck sheets under them, they're often just a touch smaller. This difference won't be noticeable in your bed frame, so don't worry!

The stiffer nature of the innerspring coil does have to be accounted for, but the manufacturers do that for you.

All these sizes have different intended purposes, and below we've listed those for you! Whether your baby is growing up and you want to get them a real bed to sleep in, or maybe your old double just isn't good enough for two people anymore, there's options for everyone. 

Mattress Sizes Explained

Mattress Depth | Bed Depth

Bed depth varies depending on the type of mattress and the company that makes them. Taller beds can be difficult to crawl in to and short ones are harder to get out of, so all Gotta Sleep mattresses are 10.5 inch deep. Some of our competitors go as low as 6 inches and some offer mattresses which are 16 inches thick. This is important to consider when choosing a bed frame and box-spring.

Crib Mattress Size - 28" x 51"

Crib mattresses are designed to be used by one infant or baby. The average height of a crib is 51 inches. The average width of a crib is 28".

Small Single or Cot Mattress Size - 30" x 75"

Small Single or Cot mattresses are designed to be used by one person. The average height of a small single is 75 inches. The average width of a small single is 30".

Twin Mattress Size or Single Mattress Size- 39" × 75"

Despite ‘Twin’ being in the name, twin sized mattresses are intended to be used by one person. The average length of single bed is 75 inches. The average width of single bed is 39".

Their small size means they’ll fit well in most spaces. It’s a great size for growing kids to give them enough space to sleep and grow without taking up so much space in their room. It’s also the most common bed measurements found in dorms due to their compact but comfortable size, though it's a bit short for some college students. Because of that, a lot have switched to the Twin XL.

Twin XL, Single XL, or TXL Mattress Size - 39" × 80"

Twin XL bed dimensions measure 39" × 80".  The average length of Twin XL bed is 80".  The average width of Twin XL bed is 39".  

Like a twin, this mattress is the same width, but is 5 inches longer to accommodate taller sleepers. This size is commonly used for growing teenagers who are close to 6’0” and in dorm rooms where there's more athletes.

It’s a longer economy size that’ll fit well in the spare room, or in the small apartment bedroom you're sleeping in, without being too short for your legs. Or whatever pet you have sleeping at the foot of it.

Super Single or Three-quarters (3/4) Mattress Size - 48" × 75"

Super Single bed dimensions measure 48" × 75". The average width of a single bed is typically 48". The average length of a single bed is 75". 

Super Single beds are a throwback to the 1920s.  Designed for one sleeper but often accommodating two, these beds are very rare on the market today. For the most part, only antique bed frames and military living quarters will require this size, so Gotta Sleep doesn’t carry it. You'll like have to find a custom or specialty mattress store to get a mattress this size that is both comfortable and new.

Full Size or Double Mattress Size - 54" × 75"

Double mattress measurements or full size bed dimensions typically measure 54" × 75". The average length of a double bed can extend to 75" depending on the manufacturer. The width of a double or full bed is 54"

The double, or the full, used to be the industry standard for a bed meant for two people. It wasn’t until the 1950's that the Queen-sized mattress overtook the market, as ad campaigns didn't want to depict couples getting too close, and the space was quite appealing. 

It’s a popular choice nowadays for spare bedrooms, luxurious singles, growing children, or rooms that would just be overtaken by a bigger mattress size.

Full mattresses work great for children as they are cost-effective and are long enough to last until the child has grown into an adult and can buy their own mattress for their needs.

Full size box spring dimensions differ based on the model so be sure to check your vendor's specifications if you're worried about it.

Double XL or Full XL Mattress Size - 54" x 79½"

The Full XL or Double XL comes is typically 53" × 80".  The average length of Double XL bed is 80". The average width of Double XL bed is 53".

Just like the Twin XL, the Double or Full XL is made longer and a little less wide. It’s meant to accommodate taller sleepers who just don't have the space for a Queen sized mattress. Or maybe they just like the cozy feeling of a smaller bed, it's all about your own comfort. As this is a far less popular option, this is not a size we carry at Gotta Sleep.

Queen Mattress Size - 60" × 80"

Queen-sized mattresses range between 55 and 100 pounds and the average dimensions of a queen size bed typically are 60" × 80" or 152 cm × 203 cm.  The average length of Queen bed is 80" or 203 cm. The average width of Queen bed is 60" or 152 cm.

Queen sized mattresses have become the preferred size on the market. It’s considered the ideal size for two people to share and fits comfortably into most modern bedrooms. As the standard on the market, you won't find a single manufacturer that doesn't offer the size.

Queen beds provide plenty of space for sleeping, even for those who move a lot in their sleep. Gotta Sleep offers high-quality Queen-sized memory foam mattresses that greatly reduces motion transfer. This makes it even more desirable for couples, as getting up or rolling over won’t disrupt the other person’s sleep.

Queen mattresses have more room than the rest of the list so far, so restless sleepers can sleep through the night without being bothered every time the person next to them turns in their sleep. Sure, bigger mattresses do this too, but bigger is not always so much better.

Because it's the most popular size on the market, it's where the market is most competitive. That's good news for buyers, because you'll be able to find a better deal with significantly less work on your part.

Queen RV Mattress Size (common in recreational vehicles) - 60" x 75"

A Queen RV bed dimensions measure 60" x 75". The average length of Queen RV bed is 75" +/- 2 inches for inner spring mattresses and +/- 1 inch for foam mattresses.  The average width of Queen RV bed is 60".

Essentially a Queen mattress but 5 inches shorter, the Queen RV is exactly what it sounds like. They’re made for Fifth Wheel, Travel Trailers, and Motor homes, where every bit of space matters. 

It’s rarely found outside of these mobile homes, as the name would imply it was a size invented with nothing but RVs in mind. We don't carry the size here at Gotta Sleep, and in fact most companies don't. You'll have to find a company specializing in them in order to get the right size, but wherever you got the trailer will tell you exactly where to go.

Olympic Queen Mattress Size - 66" x 80"

Olympic Queen bed dimensions measure 66" x 80". The average length of an Olympic Queen bed is 80" +/- 2 inches for inner spring mattresses and +/- 1 inch for foam mattresses.  The average width of an Olympic Queen bed is 66".

California Queen Waterbed Insert Size - 58" × 82"

California Queen Waterbed Insert bed dimensions measure 58" x 82". The average length of an California Queen Waterbed Insert bed is 82".  The average width of an California Queen Waterbed Insert bed is 58".

King Mattress Size - 76" x 80"

King bed dimensions measure 76" x 80". The average length of King bed is 80". The average width of King bed is 76".

At double the width of a twin, the King-sized mattress offers 16 inches more wiggle room than the Queen. Even the most restless sleepers won’t disturb their partners on this massive surface. Not recommended for smaller rooms unless taking up the entire floor-space with a mattress is your idea of a perfect bedroom.

For those who often have children or pets joining them to sleep, or for people like Kawhi Leonard, the King-sized mattress is large enough to accommodate everyone without feeling cramped. It’s highly recommended for families who have the space. We often hear couples say that once they got a King-sized mattress, they couldn’t comfortably go back to a smaller size. 

If you are interested king bed dimensions Canada, you don't have to worry they are the same as the US, so that bed frame you inherited can be filled here too.

If you have a small bedroom, we would not recommend this large-sized mattress, but for medium to larger rooms, this is often the most comfortable choice for couples who like to spread out in their sleep.

California King Waterbed Insert Size - 70" × 82"

California King Waterbed bed dimensions measure 70" x 82".  The average length of the California King Waterbed is 82".  The average width of the California King Waterbed Insert is 70", 6 inches less than a King bed and 2 inches taller.

California King Mattress Size - 72" × 84"

California King bed dimensions measure 72" × 84".  The average length of the California King bed is 84".  The average width of the California King bed is 72", 4 inches less than a King bed.

If you are looking for a mattress that can truly accommodate taller people, those who like to stretch out in their sleep or share their sleeping spaces with pets or children, nothing will beat a California King mattress. Unless, of course, your name is Marc Gasol, then you might consider something custom.

A little bit narrower and a hand longer, California Kings are the kings of comfort. Tall people won't have their feet hanging off the bed, sleepers who move a lot won't be bothering their partners, dogs won't get kicked off by accident, and there's plenty of room for a kid to slip in nearly unnoticed when they have a nightmare.

The California King’s luxurious size means you might not have the space for end tables or dressers in some bedrooms. For those with the space, the sprawling space may be worth it. We suggest some drawers under the bed for convenience, there's room!

Texas (or Athletic) King Mattress Size - 80" × 98"

Texas King bed dimensions measure 80" × 98".  The average length of the Texas King bed is 80" × 98".  The average width of the Texas King bed is 98", 4 inches wider than a King bed. The average length of a Texas King is 98", 18" taller than a King

Other Considerations

When deciding on which size mattress is right for you it is important to consider a variety of influential factors. Each of these factors play a significant role in sleep quality, comfort and can help to select the perfect mattress. By carefully selecting the bed dimensions or size of mattress you are one step closer to ensuring you can receive a proper night's sleep. Things like country of origin, your height, available space, and so on. You really have to look at everything, it's a big decision! The guide below should help you on your way to finding just what you need.

Country of Origin

Mattress sizes vary from country to country. Standard sizes in Canada and the USA are mostly the same, but there are some slight variations. Common bed sizes for the U.K. and E.U. are listed below, they don't all quite match up the same way.

Popular U.K. Bed Sizes

Grand King

71 in x 79 in

180 cm x 200 cm

King

60 in x 78 in

152 cm x 198 cm

Double

53 in x 75 in

135 cm x 190 cm

Single

35.5 in x 75 in

90 cm x 190 cm

Popular European Bed Sizes

Grand King

71 in x 79 in

180 cm x 200 cm

King 

63 in x 79 in

160 cm x 200 cm

Double

55 in x 79 in

140 cm x 200 cm

Single

35.5 in x 79 in

90 cm x 200 cm

If you’re not sure about the right mattress type your bed frame, and our sizing charts are a touch too confusing, you can reach out to us for clarification. Things like manufacturing procedures, padding, and types of support can all alter both the length and width of a bed. These things can vary country to country, so it’s good to check!

Height/Size

Your height can play a large role in determining the perfect mattress size, especially if you are taller than average. XL or California King mattresses can be ideal as since they provide more length to accommodate longer legs. Or maybe you just need more height to your bed because you have a dog that likes to sleep by your feet. Whatever your reasons, you should figure out how much room you're going to need. 

When you are unable to comfortably fit your entire body on your mattress, you are potentially compromising your quality of sleep. With the wide variety of dimensions available, no one should have to sacrifice comfort as a result of their above average height. Except certain NBA players but I'm sure they can afford custom mattresses if they need to.

Room Size

The size of the bedroom or space where you would like to place the mattress is another factor to consider when choosing the perfect mattress. A mattress too small or too large can offset the feel of the bedroom and leave it feeling either empty or overloaded. If space is limited a smaller mattress is always recommended, but you do have to keep your other needs in mind. A smaller mattress might be a worthy sacrifice for your dresser set, but you might be better off with less space if you and your partner will push each other off a double sized mattress.

Before making a purchase, it’s important to measure the room to figure out how much space you have to work with. It helps to set up your bed frame, if you already have one, before you go shopping because you'll know exactly what you're working with. You want to make sure the room has enough space to safely navigate through, and enough space for other furniture like an end table and/or dresser. Of course, if the room can accommodate a larger mattress, having more space is really worth it. Who doesn't want to feel like royalty?

Want to buy a mattress online Canada? We put all this knowledge to good use and made the OMG Mattress. It's worth checking out!

Consider the Height

As mentioned before, the height of the mattress can make or break how useful it is to you. If your bed frame and box-spring are really high off the ground, really thick mattresses aren't going to serve you very well. Tall beds are harder to get in to, but short beds are harder to get out of. You have to consider all parts of sleeping while figuring out what your sleeping situation is going to look like. You don't want to throw out your back every time you stand up, and you don't want to roll onto your bed every day just because you can't lift your leg. Your own mobility affects everything, and it should be accounted for.

Number of Sleepers

For individual sleepers a Twin or Double size mattress will provide a good amount of room to make sure a quality sleep. If you share a mattress the bigger you can afford the better. For two people a Queen or King-sized mattresses are ideal. If you’re lacking space, a double-sized mattress is the next best option. It did used to be the standard, it was made for two people at one point. We're just a bit more spoiled than we used to be: and for good reason!

When sharing a mattress with two adults and children or pets a King or California King sized mattress is considered the best. These large mattresses will provide space for two or more people to sleep comfortably.

Putting a big mattress in a too-small bedroom can be a safety hazard and make the room feel cramped and uncomfortable, but sometimes it's worth the extra comfort to fill the room. Bedrooms aren't meant for much other than sleeping anyways! Just watch for fire hazards!

Custom Sizes

There are some bed frames and furniture that require non-standard sized mattresses, such as the 3/4 size and other antique sizes. There's also some people who require different amounts of space. If you need a mattress with custom dimensions, talk to us! We might be able to help. Whether you are looking for a specific RV mattress size for your Recreational Vehicle (RV), truck, unusual room, or boat, we can custom order mattresses in specific sizes to meet your needs.

Check Everything!

It’s important to be thorough when deciding which mattress is right for you. By choosing carefully you’re guaranteed a good quality and restful sleep. Check out our other page on mattress types to see what kind of mattress might serve you best, now that you know how big you need it to be. 

Remember that standard mattresses sizes Canada and standard mattress sizes USA, do not include bed linens. Linens can be finicky, but those sizes are much more standardized than mattresses. When in doubt, just but bigger and tuck it in! Better than having it curl up on you while you sleep.

If you have any questions on mattresses dimensions or anything else, contact us! We've done the research so you don't have to.