Bed sizes and mattress dimensions: a complete guide + chart
Is it time to replace your mattress? This mattress dimensions guide covers all six standard bed sizes to help you select the mattress that best suits your needs.
Bed sizes chart
The right bed size comes down to who’s sleeping in it, the size of your room, your budget, and more. These are the typical dimensions of each mattress size, along with the room size they require.
Twin
Dimensions: 38-by-75 inches
Recommended room size: 8-by-11 feet
Best for: Single sleepers, typically children
Budget: Twin Purple mattresses starting at $999
The twin mattress size is the smallest of all standard bed sizes. Also known as a single bed, the twin’s narrow width accommodates most younger sleepers and fits well into small or shared bedrooms. They also make ideal daybeds and are suitable for bunk beds.
Twin XL
Dimensions: 38-by-80 inches
Recommended room size: 8-by-12 feet
Best for: Tall single sleepers, primarily teens and in college dorms
Budget: Twin XL Purple mattresses starting at $1099
Twin XLs are as wide as standard twins but are 5 inches longer, making them ideal for taller sleepers. In shared or smaller rooms, a twin XL can provide more length to stretch out without taking up much extra space.
Most colleges furnish dorm rooms with twin XL mattresses, so you can easily find bedding and accessories in home stores or online.
Placing two twin XLs together in one bed frame makes a split king, allowing each sleeper to choose a mattress that meets their needs.
Full
Dimensions: 54-by-75 inches
Recommended room size: 11-by-11 feet
Best for: Single sleepers or cuddly couples
Budget: Full Purple mattresses starting at $1,399
Otherwise known as a double bed, a full mattress is a spacious choice for young adults who toss and turn in their sleep. It’s affordable and versatile, making it a popular choice for individuals furnishing their first solo apartment or for use in guest rooms.
Queen
Dimensions: 60-by-80 inches
Recommended room size: 10-by-12 feet
Best for: Single sleepers, couples, or even pets
Budget: Queen Purple mattresses starting at $1,499
As the most popular bed size on the market, queen mattresses offer suitable space for two sleepers at a lower price than the king size.
You’ll typically find them in primary bedrooms, though queens are also great for guest rooms. Their popularity makes it easy to find bedding and accessories like a queen size bed frame to fill your space.
King
Dimensions: 76-by-80 inches
Recommended room size: 12-by-12 feet
Best for: Two sleepers who sprawl or small families
Budget: King Purple mattresses starting at $1,999
The widest option among standard sizes, the king mattress appears luxurious in large primary bedrooms.
Many brands make split king mattresses. With the same measurements as a king, split kings allow for customized sleep experiences with different firmness or elevation levels when paired with an adjustable base.
California King
Dimensions: 72-by-84 inches
Recommended room size: 12-by-12 feet
Best for: Two taller individuals, plus pets
Budget: California king Purple mattresses starting at $1,999
Although narrower than a standard king, California king mattresses are the longest standard bed size, with 4 extra inches to stretch your legs or as a place for Fido to keep your feet warm.
Considerations for your mattress size
Mattresses directly impact the quality of your sleep. Upgrading or downsizing means swapping out furniture and linens. Make sure you invest in the right mattress size, bed frame, bedding, and pillows for a bedroom that feels cohesive and comfortable. When choosing the right mattress, keep these factors in mind:
Sleeping partner
Who will you share the mattress with? Queens may be a popular bed size for couples, but for couples with children or pets, a king might be best option.
Room size
Leave at least two feet of space around the mattress to ensure you can move around comfortably. Also, consider door and staircase widths for maneuvering your mattress.
Body size
Most beds are wide enough for at least one person but may not be long enough. For someone 6 feet or taller, consider mattresses at least 80” long.
Sleep positions
Consider how much space you need based on your sleep position. If you move around when you sleep, are a side or combination sleeper, or just want extra space, go for a wider mattress.
Budget
Understand what influences mattress prices: size, quality, and mattress type. High-quality mattresses may cost more, but can last longer and support your body better.
Future plans
Mattresses are a long-term investment. While a smaller mattress may be the right fit now, if you plan to move or grow your family within the next 5 to 10 years, consider the next size up.
Find your perfect mattress
We’re here to help you find that just-right fit — take our Mattress Quiz for personalized recommendations based on your sleep habits (and hurdles).
Three levels of adaptive comfort
Each mattress collection builds upon our exclusive GelFlex Grid technology, offering additional ways to reduce sleep barriers.
Essential Mattresses
88% of trial participants felt satisfied with their sleep**
2” of GelFlex Grid helps you stay comfortable while changing sleep positions—unlike traditional foam mattresses that resist movement.
Restore Hybrid Mattresses
95% of trial participants felt satisfied with their sleep**
Up to 3” of GelFlex Grid and responsive coils offer pinpoint pressure relief and enhanced temperature balancing capabilities.
Rejuvenate Luxe Mattresses
100% of trial participants felt satisfied with their sleep**
Up to 5” of GelFlex Grid and DreamLayer™ top offer instantly soothing, cool-to-the-touch comfort as soon as you lay down. Try it to believe it.
Try it to believe it
Stop by one of our 3400+ locations to feel the GelFlex Grid in our products and discover just how good your sleep can be.
Other ways to connect
Nonstandard bed sizes
While the standard mattress sizes suit most sleepers, some may prefer a nonstandard bed size. A bigger bed may be a better fit for tall or heavier individuals, as well as families who co-sleep with children or pets. Most nonstandard sizes are sold online or as made-to-order mattresses.
Oversized mattresses
Anything larger than a standard king is considered an oversized mattress, and most of the different king size beds fall in this category. Extra large mattresses include:
- Olympic queen: 66-by-80 inches
- Wyoming king: 84-by-84 inches
- Texas king: 80-by-96 inches
- Alberta king: 96-by-96 inches
- Alaskan king: 108-by-108 inches
- Family beds: 108 to 144 inches wide and 80 to 84 inches long
Other specialty mattresses
Specialty beds like RV mattresses share some measurements with standard sizes, but these are shorter to fit in vehicles with sleeping areas. Some of the most common specialty mattress sizes include:
- RV bunk: 28-by-75 inches
- Three quarter: 48-by-75 inches
- Full XL: 54-by-80 inches
- Short queen: 60-by-75 inches
- Short king: 72-by-75 inches
- Super king: 72-by-78 inches
- RV king: 72-by-80 inches
Bed size frequently asked questions
For single sleepers, a twin, twin XL, or full bed would be best in a smaller bedroom, especially if you have furniture like a dresser or nightstand.
Couples can make a full size bed work, though a queen is more spacious if your room can accommodate it.
The smallest standard bed size is the twin mattress, measuring 38 inches wide and 75 inches long. Some mattresses made for infants and young children are available in smaller dimensions from children’s mattress manufacturers. The four most common children’s bed sizes are:
- Bassinet: Traditionally about 15-by-30 inches
- Mini crib: About 24-by-38 inches
- Standard crib: About 28-by-52 inches
- Small single: 30-by-75 inches
For single sleepers, a twin, twin XL, or full bed would be best in a smaller bedroom, especially if you have furniture like a dresser or nightstand.
Couples can make a full size bed work, though a queen is more spacious if your room can accommodate it.
A 60-by-80-inch bed is a queen mattress. Like most standard bed sizes, it is longer than it is wide.
Yes, a person who is 5’10” can fit on a full size bed since they are 5 inches shorter than the length of the bed. Depending on the size of their pillow, preferred sleep position, and whether or not they sleep with a pet at the foot of their bed, a queen or larger may be better for someone this tall.
No, a full bed is smaller than two twins. Full mattresses measure 54-by-75 inches while twins measure 38-by-75 inches, so two twins would be wider than a full mattress by 22 inches.
Yes, full mattresses are big enough for two people, but couples with specific sleeping preferences might benefit more from a king or queen compared to a full bed. Alternatively, you can get two twin XLs to create a split king and use an adjustable frame.
Of the different bed sizes, the queen is the most popular mattress size as it suits both single sleepers and partners. Shopping for accessories like sheets, duvets, and bed frames is easy as well, as most home stores sell queen size accessories.