King Size Mattresses
Complete Your Sleep System
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King Size Mattress Frequently Asked Questions
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What are the dimensions of a king size mattress?
The dimensions of a king bed are 76" wide and 80" long, or, 6' 4" by 6' 8". The height of the mattress varies by model but generally ranges from 6" tall all the way up to 18" tall.
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What's the difference between a king and a cal king bed?
A king size mattress measures 76" X 80" while a cal king mattress measures 72" X 84". There is no real difference in the area of the bed, it's really all about the length. The cal king was designed for people who are 6' 2" or taller so that their feet do not hang off the bed.
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What's the size difference between a king size and a queen size bed?
An extra sixteen inches of width. A queen size mattress measures 60" by 80" while a king size mattress measures 76" by 80".
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Do I need a box spring for a king size mattress?
Yes, a king mattress needs a proper foundation on which to rest and provide you with comfort. However, box springs are unnecessary if you have a platform bed. Also, king box springs come in two pieces for ease of shipping, movement through the house, and set up.
Need Help Choosing a Mattress?
The mattress experts at Gardner White have your back! Our Mattress Buying Guide can help you cut through all the confusion when you're shopping for a new mattress. Decades of collective experience went into creating the perfect guide for mattress shopping, check it out now!
We've also developed a list of the Best Mattresses of 2025. These include the Best Innerspring Mattress, the Best for Back Pain, and the Best Cooling Mattress among ten other 'Best Of' models. If you're looking for the best of the best in a new mattress, this list is your go-to guide to find youre perfect fit!
