Complete Mattress Sizes Guide: Size Chart & Dimensions

Standard U.S. mattress sizes range from a 38" x 75" Twin to a 72" x 84" California King. The six most common sizes are Twin, Twin XL, Full, Queen, King and California King, and each offers a different amount of sleeping space and needs a different amount of bedroom floor space. Beyond these, a handful of oversized specialty sizes go as large as the 108" x 108" Alaska King.

This mattress size guide includes a complete chart of dimensions for every standard U.S. bed size, plus the less common sizes you may come across. Compare them to find the right fit for your bedroom, number of sleepers, height, sleeping habits and lifestyle.

U.S. Mattress Sizes Chart & Dimensions

Mattresses in the U.S. typically come in six standard sizes: Twin, Twin XL, Full, Queen, King and California King. Here's a detailed mattress size chart with the dimensions of each standard option.

Looking for something wider or longer than a California King? Jump to the uncommon mattress sizes section below for Olympic Queen, Wyoming King, Texas King and Alaska King dimensions.

Twin Mattress Size Guide

A twin mattress measures 38 inches wide by 75 inches long (97 x 191 cm). It's the smallest standard U.S. mattress size and is commonly used for children, teenagers, bunk beds and smaller bedrooms. Explore our twin mattresses if you're furnishing a kid's room or a compact guest room.

Who Should Choose a Twin Mattress?

• Children moving up from a toddler bed
• Teenagers
• Guest rooms with limited space
• Single adults who prefer a compact sleeping setup

How Much Space Does a Twin Mattress Need?

A bedroom around 7 x 9.5 feet can usually fit a twin bed while still leaving room for basic furniture and a walkway. That makes twin one of the easiest mattress sizes to work with in compact guest rooms and children's bedrooms.

Twin XL Mattress Size Guide

A twin XL mattress has the same width as a twin but is 5 inches longer, measuring 38 inches wide by 80 inches long (97 x 203 cm). It's the standard size in most college dorms and suits taller sleepers without taking up much more floor space.

Twin XL vs. Twin Mattress

Twin and Twin XL mattresses share the same 38-inch width. The difference is length: a Twin XL adds 5 inches, which matters for teens and adults close to 6 feet tall or taller.

Full Mattress Size Guide

A full size mattress, also known as a double bed, measures 54 x 75 inches (137 x 191 cm). It gives single sleepers room to spread out and can work for couples who don't mind sleeping close together. Many adults choose a full mattress for smaller apartments. Browse our full size mattresses to compare options.

Who Should Choose a Full Mattress?

• Single adults
• Teenagers
• Guest bedrooms
• Smaller apartments

Can Two People Sleep on a Full Size Mattress?

Two adults can share a full mattress, but the width is limited. A 54-inch-wide mattress gives each person about 27 inches when shared equally, which is narrower than a Twin. For couples who sleep together every night, a queen mattress is usually the more comfortable starting point.

Full vs Twin Mattress Comparison Chart

A Twin mattress measures 38 inches wide by 75 inches long, making it ideal for children, teenagers, dorm rooms and smaller bedrooms where saving space matters. A Full mattress is the same length but 16 inches wider at 54 inches, giving one adult much more room to move.

Queen Mattress Size Guide

The queen mattress is the most popular size for couples, measuring 60 x 80 inches (152 x 203 cm). It fits comfortably in most bedrooms and works with most U.S. bed frames, so for many couples it offers the best balance of comfort and practicality. Explore BedStory queen mattresses to find your fit.

Who Should Choose a Queen Mattress?

• Couples
• Primary bedrooms
• Taller adults
• Sleepers who occasionally share the bed with a child or a pet

How Much Space Does a Queen Mattress Need?

A bedroom of around 10 x 10 feet or larger is a good starting point for a queen bed.

Full vs Queen Mattress Size Chart

King Mattress Size Guide

A king size mattress, also called an Eastern King, measures 76 x 80 inches (193 x 203 cm), making it the widest of the standard U.S. mattress sizes. It's ideal for couples who want plenty of personal space and suits larger bedrooms, with room for a child or pet as well. Shop our king size mattresses to compare models.

Who Is a King Size Mattress Best for?

• Couples who want more personal space
• Larger sleepers
• Combination sleepers
• Couples with different sleeping positions
• Parents who occasionally share the bed with children
• Pet owners whose pets sleep on the bed
• Large primary bedrooms

What Room Size Is Best for a King Mattress?

A room of around 12 x 12 feet or larger gives a king mattress a comfortable layout with space for nightstands and walkways.

King vs Queen Mattress Size

A king and a queen are the same 80-inch length, but a king is 16 inches wider. Shared between two people, that works out to 38 inches of personal width on a king versus 30 inches on a queen.

California King Mattress Size Guide

The California King mattress, often shortened to Cal King, is slightly narrower and longer than a standard king, measuring 72 x 84 inches (183 x 213 cm). The extra 4 inches of length makes it the best standard size for taller sleepers who need more legroom, and its narrower footprint suits long, narrow bedrooms. Explore BedStory california king mattresses if length matters more to you than width.

Despite the name, a California King isn't the biggest standard mattress overall. Its 6,048 square inches of sleeping surface is almost identical to a king's 6,080 square inches. The space is simply arranged differently: 4 inches less width in exchange for 4 inches more length.

Who Should Choose a California King Mattress?

• Sleepers taller than 6'4" who hang off the end of an 80-inch mattress
• Couples where one or both partners are tall
• Sleepers who like a pet curled up at the foot of the bed
• Long, narrow primary bedrooms where a 76-inch-wide king feels tight
• Stomach and side sleepers who stretch out with their feet pointed

How Much Space Does a California King Mattress Need?

A bedroom of around 11 x 13 feet or larger gives a California King enough room for nightstands and walkways. Because it's 4 inches narrower than a king, it leaves a little more space on either side of the bed, while the extra length needs a deeper room. Leave about 2 feet along each side and at the foot of the bed.

Before ordering, measure doorways, hallways and stairways along the delivery route. Large sizes are much easier to move into a bedroom when they arrive compressed, which is one reason a mattress in a box is a practical choice for a California King.

California King Bed Frames and Bedding

A California King needs a California King bed frame or foundation, since a standard king frame is too wide and too short for it. The same goes for fitted sheets and mattress protectors: standard king fitted sheets will be about 4 inches too wide and 4 inches too short, so look for products labeled California King. Flat sheets, comforters and duvets are more forgiving, and many king-size versions will still cover a California King.

King vs California King

Choose a king if you want the most width for two sleepers, kids or pets. Choose a California King if you or your partner need extra length.

Uncommon Mattress Sizes: Olympic Queen, Wyoming King, Texas King & Alaska King

Beyond the six standard sizes, there are a few specialty mattress sizes for sleepers who want extra width or length. These sizes are rare in stores and are usually made to order, so they often need matching custom bed frames, sheets and bedding.

Olympic Queen Mattress Size

An Olympic Queen measures 66 x 80 inches (168 x 203 cm), 6 inches wider than a standard queen with the same length. It gives couples a bit more elbow room without moving up to a king. Standard queen fitted sheets may stretch to fit, but most Olympic Queen beds need a matching frame, and the size is no longer widely made.

Wyoming King Mattress Size

A Wyoming King is a square mattress measuring 84 x 84 inches (213 x 213 cm). It's 8 inches wider and 4 inches longer than a standard king, giving couples more space in both directions. It suits large primary bedrooms of around 13 x 13 feet or more.

Texas King Mattress Size

A Texas King measures 80 x 98 inches (203 x 249 cm). At 14 inches longer than a California King, it's the size built for very tall sleepers who still hang off the end of an 84-inch bed. Because of its length, it needs a long room, ideally at least 14 feet deep.

Alaska King Mattress Size

An Alaska King is the largest mattress size you're likely to find, measuring 108 x 108 inches (274 x 274 cm), or 9 x 9 feet. It's designed for families who co-sleep with children or several pets, and it needs a very large bedroom of around 15 x 15 feet or more.

How to Choose the Right Mattress Size

The right mattress size depends on more than the dimensions of your bedroom. Before buying a mattress, consider these key factors.

1. Bedroom Size

Start with the usable floor space in your bedroom. Your mattress and bed frame should fit comfortably without blocking doors, closets or walkways.

A larger mattress gives you more sleeping space, but it can also make a small bedroom feel crowded. Leave about 2 feet around the bed for nightstands, dressers and other essential furniture.

2. Number of Sleepers

Who will sleep on the mattress regularly? For couples, Queen, King and California King mattresses are the most practical. Twin, Twin XL and Full mattresses work best for kids, teens and single sleepers up to 6'4".

3. Sleeper Height

Your height also affects which mattress size you need. Sleepers under 6' (183 cm) can sleep comfortably on any standard size, including the 75-inch-long Twin and Full. Sleepers between 6' and 6'4" should look for an 80-inch length, such as a Twin XL, Queen or King. Sleepers taller than 6'4" (193 cm) need more than 80 inches of length, which makes the 84-inch California King the best standard choice.

4. Sleep Positions

Side and back sleepers can fit comfortably on several mattress sizes, while combination sleepers who change positions often will appreciate extra width. Queen, King and California King mattresses give you more room to move and stretch out. Your sleep position also shapes how firm your mattress should be, so check our mattress firmness guide as well.

5. Children and Pets

Do you often share the bed with children or pets? If so, factor in their space. A queen mattress can work for one adult with a small child or pet, while a King or California King leaves more room for the whole family.

6. Bedroom Furniture

Don't evaluate mattress dimensions in isolation. Your bed needs to work with the rest of the room, so leave at least 2 feet for nightstands, dressers and walkways.

7. Budget

Set a budget before you shop. Mattress prices vary widely by size, materials and brand, and larger sizes also cost more to outfit with frames and bedding. A quality mattress is a long-term investment in your sleep and comfort.

8. Future Plans

Consider lifestyle changes that may be coming. You might move in with a partner, start a family or get a pet. Choosing a slightly larger mattress now can save you the hassle of upgrading later.

Conclusion

Choosing the right mattress size can improve both your sleep and the way your bedroom feels. Use this quick checklist:

• Twin 38" x 75": best for kids, teens and bunk beds
• Twin XL 38" x 80": best for taller single sleepers from 6' to 6'4"
• Full 54" x 75": best for single sleepers and guest rooms
• Queen 60" x 80": the best all-around choice for adults and couples
• King 76" x 80": best for couples, or adults who share the bed with a child or pet
• California King 72" x 84": best for tall sleepers over 6'4"
• Olympic Queen, Wyoming King, Texas King and Alaska King: specialty sizes for extra width or length, usually made to order

Size is only one part of sleep comfort. When choosing a mattress, also consider:

• Firmness
• Spinal support
• Pressure relief
• Motion isolation
• Edge support
• Temperature regulation
• Mattress height
• Sleeping position

For a step-by-step walkthrough of these factors, read our mattress buying guide.

FAQs

What are the standard U.S. mattress sizes?

• Twin: 38" x 75"
• Twin XL: 38" x 80"
• Full: 54" x 75"
• Queen: 60" x 80"
• King: 76" x 80"
• California King: 72" x 84"

What is the biggest mattress size?

The Alaska King is the largest mattress size, at 108" x 108" (9 x 9 feet). Other oversized options include the Texas King (80" x 98") and the Wyoming King (84" x 84"). Among the standard sizes, the King is the widest at 76 inches and the California King is the longest at 84 inches.

What is an Olympic Queen mattress?

An Olympic Queen measures 66" x 80", which is 6 inches wider than a standard queen with the same length. It's an uncommon size, so frames and fitted sheets can be harder to find.

What's the best mattress size for kids?

Twin, Twin XL and Full mattresses work well for kids and fit easily in compact bedrooms. Twin and Twin XL mattresses also work for bunk beds, which saves space for families with two children sharing a room.

What's the best mattress size for couples?

A 60" x 80" queen mattress is a practical starting point for most couples. A 76" x 80" king gives each person 8 inches more personal space than a queen. Couples where one partner is taller than 6'4" should consider a 72" x 84" California King.

How much bigger is a queen than a full?

A 60" x 80" queen mattress is 6 inches wider and 5 inches longer than a full. A full is usually enough for one sleeper, but a queen is the better choice for two people who want room to stretch out.

How much bigger is a king than a queen?

A standard king is 16 inches wider than a queen and the same 80-inch length. For couples, that means 8 inches more personal sleeping space each.

What mattress size is best for tall sleepers?

Twin XL, Queen and King mattresses are all 80 inches long and suit sleepers from 6' to 6'4". The California King, at 84 inches, is the longest standard size and the best choice for sleepers over 6'4". For even more length, the specialty Texas King measures 98 inches long.