The Size of Full-Sized Box Springs

A full-size box spring, which is also known as a "double," is usually constructed of many metal springs surrounded by a wooden frame.


A full-size box spring is 75 inches in length..A full-size box spring is 75 inches in length..
When placed underneath a similar size mattress, the sturdiness of a full-size box spring helps to create a comfortable bed.

The dimensions of a full-size box spring vary depending on whether it's a low- or high-profile version. The lower versions are approximately 5 1/2 inches in height, while the high-profile version is a standard 9 inches in height. The difference between the low and high profiles is purely ascetic. The width of a full-size box spring is 53 inches, just 15 inches more than a twin, or single size.


According to Dimensions Guide, in general, full-size box springs serve three basic purposes. They work to create a flat surface, sturdy enough to place a mattress on top, act as shock absorbers, and help raise the mattress height, making it easier to get in and out of bed. A full-size box spring also helps to expand the surface area and provides further support.

Other Considerations

At 75 inches long, a full-size box spring is the same length as a twin size. This measurement, however, is often the deciding factor when choosing between full and queen-size box spring sets, (a queen-size bed is 80 inches long). This relates particularly to men, who are typically taller. If sharing a full-size bed, each person would have 27 inches to themselves, which is the approximate width of a baby crib.

About the Author

Kate Agliata began writing in 2002 and has written for the “Niagara Gazette” and “Bee Newspapers” and has also worked as the editor of the “Clarence Bee.” She has articles published online at Got2BeGreen and WeTeach. Agliata holds a Master of Arts in English from Georgia Southern University and a Bachelor of Arts in journalism from State University of New York, Buffalo.