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800.588.5720
FLASH SALE: Use code UNBOX50 for an extra $50 off!

Mattress Size Guide

Mattress Size Guide
Twin: 38" x 75"
Twin XL: 38" x 80"
Full: 53" x 75"
Queen: 60" x 80"
King: 76" x 80"
California King: 72" x 84"

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 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.