The Ultimate Mattress Size Chart and Bed Dimensions Guide

The Different Sizes of Beds: Finding the Perfect Fit for Your Bedroom Choosing the right size mattress for your bedroom may seem like a simple task, but there are actually many factors to consider. From...

The Different Sizes of Beds: Finding the Perfect Fit for Your Bedroom

Choosing the right size mattress for your bedroom may seem like a simple task, but there are actually many factors to consider. From the dimensions of your room to the amount of legroom you desire, finding the perfect bed can be a bit more complicated than you think.

To help you make an informed decision, we have put together a comprehensive guide to the most common mattress sizes. Whether you are shopping online or in-store, this guide will give you a clear idea of which size is right for you and your bedroom.

Small Single Bed (Cot) Dimensions

Illustrated image of Small Single Cot Dimensions

Starting with the smallest option, the Small Single Bed (Cot) is the size of a crib mattress. It can also serve as a toddler bed once your baby outgrows the cot. Typically measuring 30” wide and 75” long, this size is perfect for young children.

If you are looking for a crib mattress or toddler bed, be sure to check out our selection of the best Crib Mattresses here.

Twin Bed Dimensions

Illustrated image of Twin size bed dimensions in inches

A typical single, twin, or bunk mattress measures 38” wide and 75” long. This size is ideal for children who have outgrown cribs and toddler beds and are ready for a larger mattress. Additionally, it works well for those who sleep in tight quarters, have small rooms, or share a room with a sibling or roommate.

Twin beds can also be used as day beds, bunk beds, dorm room beds, and in guest rooms. They are versatile and practical for various situations.

Twin XL

Twin XL Bed Dimensions Illustration

For adults who need a bed that saves space but still provides comfort, the Twin XL is a great option. It measures 38” wide and 80” long, making it 5” longer than a standard twin bed. This extra length can make a significant difference for taller individuals.

If you want to know more about the differences between Twin XL and Twin beds, check out our comprehensive Twin XL vs. Twin guide here.

Full Bed Dimensions

Illustration of full size bed dimensions in inches

Full-size mattresses, also known as "Standard Double", measure 54” wide and 75” long. They are larger than Twin beds and offer more room for adults who need extra space. However, if you share the bed with a partner, the Full size may feel a bit snug.

Full-size beds are an excellent choice for those on a budget or who have a pet or child that sleeps next to them. They provide a wider option compared to Twin beds.

If you are considering a Full size mattress, we recommend checking out the Helix Kids or the WinkBeds Original. The Helix Kids is specifically designed for children, while the WinkBeds Original offers versatility and solid edge support for partners.

Full (Double) XL

Double Bed XL measures in inches

The Full XL bed measures 54” x 80”, providing an extra 6 inches of leg space compared to the Full size bed. If you don't need extra width but want more room for your legs, the Full XL is a perfect option.

To learn more about the differences between Double and Full size mattresses, check out our detailed Double vs. Full mattress comparison here.

Queen Bed Dimensions

Image showing a queen size bed dimensions in inches

Queen size mattresses measure 60” wide and 80” long. They are long and wide enough to accommodate most sleepers comfortably. If you sleep with a spouse, child, or pet, a Queen bed might be the perfect choice for you.

When considering larger sizes like Queen, it's essential to take your living space into account. They take up more room than Twin or Full beds, so make sure your bedroom can accommodate the larger size without feeling too cramped.

If you are interested in a Queen size mattress, we suggest checking out the DreamCloud Original or the Nectar Original. The DreamCloud offers a luxurious design with premium features, while the Nectar excels in categories such as pressure relief and support.

Olympic Queen

Image showing the size of an Olympic Queen type

Olympic Queen mattresses are slightly wider than standard Queen beds, measuring 66” wide and 80” long. They are perfect for those who want more width but don't want to upgrade to a King size bed.

King Bed Dimensions

King Bed Dimensions Illustration

The standard King size mattress measures 76” wide and 80” long. We recommend considering this size only if your room is at least 12x12 square feet. King size beds provide ample space for couples who sleep with their kids or pets and desire extra room for themselves.

It's worth noting that a King bed is equivalent to two Twin XL beds. This can be a great solution for couples who have different firmness preferences or sleep positions.

For a high-quality King size bed, we recommend the Saatva Classic or the Nolah Evolution. The Saatva Classic offers premium support with its dual coil unit, while the Nolah Evolution is equipped with advanced cooling features.

California King Bed Dimensions

Illustrated image of California King measurements

The California King mattress measures 72” wide and 84” long, making it one of the largest options available. This size is perfect for active sleepers, taller individuals, or couples with kids or pets. The California King is 4” longer but 4” narrower than a standard King bed.

To accommodate a California King mattress, we recommend having a large room of at least 12x12 square feet.

For a detailed comparison between California King and King size mattresses, check out our comprehensive guide here.

What to Keep in Mind When Choosing the Right Mattress Size

Bedroom Size

Before choosing a new mattress, it's essential to consider the dimensions of your bedroom. Ensure that the size you select fits comfortably in your room, allowing you to open the door and move around without any obstacles.

Refer to the illustrations below to understand how different mattress sizes will fit in your room.


When choosing the right mattress size for you or your family, there are a few important factors to keep in mind.

First, if you are considering an upgrade, make sure you know the dimensions of your current bed to avoid purchasing the same size accidentally.

Second, if you are moving, remember to measure the room where you will be placing your new mattress. It's crucial to have enough space for the mattress to fit comfortably without restricting your movement or compromising the aesthetics of the room.

Finally, consider who will be sleeping in the bed. If you are the only user, a Double size bed is sufficient. However, if you share the bed with a spouse, kids, or pets, you may want to opt for a larger size such as Queen or King. King size beds offer the ultimate comfort if your room can accommodate them.

Now that you have a better understanding of different mattress sizes, you can explore our other guides on various mattress styles and brands to find the perfect fit for your needs.