What is the Size of a King Box Spring?

Find out how to properly measure your bed and determine which size box spring is right for you.

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A box spring is a type of bed base that typically consists of a wooden frame covered in fabric. It sits under the mattress and provides support and stability. Box springs come in a variety of sizes, the most common being twin, full, queen, and king. They can also be found in speciality sizes like California king and Split king. The size of a box spring is determined by the size of the mattress it is meant to support. For example, a queen-size box spring is meant to support a queen-size mattress.

Standard Sizes

King sized beds have become increasingly popular in recent years. Many manufacturers have started selling king sized bedding, which includes sheets, comforters, and pillows. One important item that is often overlooked is the box spring. A box spring is a platform that sits under the mattress and provides support. Box springs come in a variety of sizes, but the standard size for a king bed is 76 inches by 80 inches.

Custom Sizes

King box springs are available in custom sizes. The most common custom sizes are five inches, six inches, and seven inches. Custom sizes can be ordered from most retailers that sell box springs.


Now that you know all about box springs, including what they are and how much they typically cost, you may be wondering if you need one for your mattress. The answer to this question is determined by a few factors, such as the type of mattress you have, your personal sleep preferences, and whether or not you plan on using a frame. In general, though, most people will find that a box spring provides a nice solid foundation for their mattress, helps to prolong its lifespan, and can even provide some additional storage space underneath.