Mattress Sizes
and Dimensions

Choosing the Right Size
Mattress is the First Step
to Getting Your Best Sleep

Thinking about upgrading your old mattress? Picking the right size mattress can help you avoid the costly and frustrating hassle of having to return a bed that doesn’t fit your bedroom (or your needs).

And if you’re making the leap to an entirely new mattress size, choosing the right dimensions is doubly important, as you have to consider how much sleeping space that you’ll need for ultimate comfort and the best night’s sleep possible.

Mattress Size Chart

The good news is that you can use the convenient mattress sizing charts below to guide you in making the right size selection, and the best choice for your new mattress.


38” x 75” x 10”

Twin XL

38” x 80” x 10”


54” x 75” x 10”


60” x 80” x 10”


76” x 80” x 10”

Cal King

72” x 84” x 10”

While adults can sleep on a twin size mattress, it is most commonly used with children’s bed frames, as it is the smallest sleep area of all the standard mattress sizes. Twin mattress dimensions are typically 38 inches wide by 75 inches long (38” W x 75” L).

Check out Lull's Twin Mattress

With 5 inches of additional length, the twin XL (extra long) mattress is a great option for college students due to its extra leg space – this size mattress is regularly found in university dorm rooms. Twin XL mattress dimensions are typically 38 inches wide by 80 inches long (38” W x 80” L).

Check out Lull's Twin XL Mattress

Also known as a “double mattress,” a Full size mattress is a great choice for growing children, but usually doesn’t provide enough space for two adults to share comfortably, especially if they are over 5’8” tall. Full mattress dimensions are 54 inches wide by 75 inches long (54” W x 75” L).

Check out Lull's Full Mattress

The most popular mattress size choice for the average adult sleeper, the Queen size mattress provides more sleeping space than the Full mattress, and is usually offers enough space for two adults to sleep together in comfort, especially if you and your partner enjoy cuddling up with one another at bedtime. Queen size mattress dimensions are 60 inches wide by 80 inches long (60” W x 80” L).

Check out Lull's Queen Mattress

The best choice for partners that enjoy their own space when sleeping, or for those that share their bed with kids or pets, the King size mattress provides ample room for a quality night’s sleep. Essentially two Twin XL mattresses merged together, the King size mattress dimensions are 76 inches wide by 80 long (76” W x 80” L).

Check out Lull's King Mattress

For people that are over 6’ tall or enjoy “family sleeping” with kids or pets, the California King size mattress is a great choice. A “Cal” King mattress is 4 inches narrower and 4 inches longer than a traditional King size mattress, giving tall sleepers plenty of room to stretch their legs. California King size mattress dimensions measure 72 inches wide by 84 inches long (72” W x 84” L).

Check out Lull's Cal King Mattress

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Online Competitors

Retail Stores

**Based on twin mattress price of top online and retail stores

Works with Bed
Frames and More

Place on any flat surface. Works with
or without a box spring.

Flat Platform

Adjustable Bed

Top Questions

The short answer is yes. You may find references to Twin mattress sizes as 39” W x 74” L. And Twin XL mattress sizes as 39” W x 80” L. Many manufacturers round-up dimensions of their mattresses to make them appear larger. In some cases by over 1 inch. The dimensions displayed on this page are more accurate measurements of your new mattress.

Unfortunately, the answer to this question is no. Bed frame manufacturers leave one to two inches around the mattress to fit into their frames. The amount of clearance will vary by manufacture. Take time to measure your sleeping space. This will ensure your bed frame will fit and leave room for movement around the bed. The Metal Bed Frame, The Platform Bed Frame, and The Foundation have been specifically designed for The Mattress, a perfect fit to complete your new bed.

Complete Your Dream Bed







Wood Frame

Wood Frame