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Mattress Size Guide

Mattress Size Guide

Before you buy any standard size mattress in a box, there are a few things to consider, such as bedroom size and budget. Below, we outline the dimensions for six standard mattress sizes to help you determine which size suits you or your family’s needs. The general recommendation is that your bedroom offers 24-27 inches of walking space on both sides and at the foot of the bed.


Twin Size

38" x 74"

Twin size mattresses are the smallest on the market, being well suited for kids, bunk beds or extra sleeping space in guest rooms.

Twin Mattress

Twin XL Size

38" x 80"

Twin XL beds provide five inches of additional length for single sleepers who need that extra room. Twin XL mattresses are great for single sleepers who are taller or for college dorm room beds.

Twin XL Mattress

Full Size

53" x 75"

Full size mattresses are great for a child’s first standard size bed - not too big, but still big enough for snuggles with mom or dad - or for your teenage child. The additional width of a full size makes it suitable for guest rooms, as well.

Full Mattress

Queen Size

60" x 80"

Queen size beds are six inches wider than full size, providing just enough breathing room between you and your partner. Queen size mattresses are the perfect size for couples or adults who simply like the extra space.

Queen Mattress

King Size

76" x 80"

King size mattresses are 16” wider than queen size beds, allowing enough room to not only share the bed comfortably with your partner, but also with your toddler and maybe even
your pet!

King Mattress

California King Size

72" x 84"

A california king mattress in a box is not quite as wide as a standard king bed, but measures at 84” long - the longest mattress on the market. California kings are ideal for taller adults, but can also benefit families who like to share the bed.

California King Mattress

Which size is right for you?

When the time comes to bring home a new mattress from BedInABox®, we want you to rest easy knowing that you picked the best memory foam mattress for you. Before clicking checkout, make sure you have evaluated who your new mattress is for and how large the sleep space is for this new mattress in a box. Your budget can also help you choose what size mattress is best for you. We hope sleep comes even easier with free matttress delivery, a 120-night risk free sleep trial and a 20-year warranty with your purchase.

Learn more about mattress sizes


Twin Size vs. Twin XL

Twin Size
vs. Twin XL


Read More
Queen Size vs. King Size

Queen Size
vs. King Size


Read More
King Mattress Size

How Big is
a King Size
Mattress?


Read More

Frequently Asked Questions


What is the most popular mattress size?

The queen size mattress is the most popular mattress size on the market and is generally used in the master bedroom or primary bedroom. At 60 inches wide and 80 inches long, queen size beds measure six inches wider than full size beds to give you plenty of space to stretch out.

What mattress size is best for couples?

The mattress size that is best suited for couples who share the bed is the queen size. Queen size beds can comfortably accommodate you and your partner with room to spare. The next best mattress size for couples is the king mattress, which is large enough to provide ample room for couples who share the bed with children or pets.

What size bed is best for an individual?

Twin, twin XL, or full size mattresses are all great options for individuals.

Twin size mattresses are the smallest on the market, measuring 38 inches wide by 75 inches long, making them great for kids or for use in guest bedrooms. In comparison, twin XL mattresses have five inches of additional length, which is great for growing children or individual adults with limited bedroom space. The full size mattress is also a great mattress for growing children, and can also be a suitable mattress size for individual adults or for use in guest bedrooms.

Where do mattress size names come from?

During the early-to-mid 1900’s, mattress sizes were largely standardized, and the twin mattress was the most popular. Over time, mattresses became a sort of status symbol, and larger and more luxurious mattresses were developed and given the names of “queen” and “king” size. Now, the twin, twin XL, full, queen, king and California king mattress sizes are all standard in the US.

Are mattress sizes the same throughout the world?

No, mattress sizes are not standard globally. There may be similar mattress names and mattress dimensions across countries, but because different countries use different measuring systems and have different lifestyles, mattress sizes tend to vary. For example, a double mattress, or a full mattress, measures 54 inches wide by 75 inches long in the United Kingdom and the United States. In contrast, a double mattress measures 55 inches wide by 79 inches long in continental Europe.