Shop award-winning California king size mattresses for great sleep, at an even greater price.
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A California King mattress is 84 inches long and 72 inches wide.
Twin Mattress - 38" x 75"
Often found in kid's rooms and studio apartments.
Twin XL Mattress - 38" x 80"
Often found in college dorm rooms and studio apartments
Full Mattress - 53" x 75"
Often found in guest rooms.
Queen Mattress - 60" x 80"
Often found in master bedrooms.
King Mattress - 76" x 80"
Often found in extra large master bedrooms.
California King Mattress - 72" x 84"
Often found in extra large master bedrooms, perfect for gathering the family.
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Our cooling, open-cell memory foam makes up the sumptuous layers of the California King Bed. It let's excess hot air escape to keep you breezy and fresh, all night long. If you’ve never slept on a cloud before, you’re in for a treat.
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Multiple layers of proprietary memory foam cradle you weightlessly, relieving pressure and lulling you gently to sleep. With its premium materials and precision design, the Cal King delivers this rejuvenating support for years to come.
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Order your California King and it’ll appear at your door in a few days. If you don’t love it, let us know within 100 days and we’ll give you a full refund anytime after the 30-Night Adjustment Period.
There are three versions to choose from if you're looking for a California King Size Bed. Our hybrid collection combines the pressure relief of our original foam with the added lift from resilient springs.
Our California King mattress comes in different flavors. Whether you’re looking for a budget-friendly streamlined model or a more luxurious option with extra features, we'll help you find the best California King mattress type for your needs.
A California king bed is 72 inches wide and 84 inches long—the longest standard mattress size available.
The extra length makes California king beds perfect for taller sleepers, couples with pets or kids, or large bedrooms. As long as your bedroom is at least 12 x 12 feet, you can accommodate a California king.
While a California king is longer, it actually takes up less total space than a king mattress, but only by a few square inches. Typically, a king-sized mattress is 76 inches wide and 80 inches long. Compared to the California king size —72 x 84 inches—a king adds 4 inches in width but loses 4 in length.
Both sizes provide a luxurious amount of room for couples and solo sleepers alike. The difference in length vs. width comes down to individual preferences and sleeping configurations. The size difference does not have a large effect on the layout of other bedroom furniture. A standard king-sized bed may fit those who need that extra wiggle room from side to side for pets, children, or simple comfort. Meanwhile, a California king bed frame better fits tall sleepers or lengthier rooms.
An Alaskan king bed is typically 108 x 108 inches, a perfect square and the largest bed size on the market. Compared to a California king bed—72 x 84 inches—the Alaskan king is 36 inches wider and 22 inches longer.
Due to its very large size, most homes can’t accommodate an Alaskan king bed—your bedroom would need to measure at least 16 x 16 feet. And because an Alaskan king is square-shaped, it also makes for an unusual interior design feature. For most homes, a California king mattress is plenty large enough.
Across all markets, an Alaskan king size bed—108 x 108 inches—is the largest available standard size. But for most homes and sleepers, it’s not a practical bed size to own, especially if you want your bedroom to be more than a sleeping space and include other furniture. Buying an Alaskan king size mattress might even prove difficult.
If you’re looking for a large, luxurious bed, we recommend a Casper Cal king mattress (72 x 84 inches) or a standard king mattress (76 x 80 inches). For tall sleepers who want extra support, a California king memory foam mattress with springs like the Wave Hybrid or Nova Hybrid will provide the length and lift you need.
You can put these mattresses directly onto a platform bed frame, sleigh bed, or any other type of bed frame.
When Casper was founded in 2014, many people were skeptical. Would consumers really buy a standard king size mattress without testing it first? Several years and numerous awards later, we have an answer: It turns out no one likes visiting stuffy mattress showrooms to make high-stakes purchases under the scrutiny of needy salespeople. (Who knew??)
Everyone loves the ease and convenience of buying online from a trusted source, and having a high-quality mattress shipped in a box to their doorstep. And people keep spreading the word that our mattresses deliver unparalleled comfort and support, top-notch construction quality, and high-tech, innovative design.
But the Casper experience isn’t just about quality, trust, and transparency. Our mattresses are a mere fraction of other brands’ prices. That’s because we’ve flipped the mattress industry on its head. By eliminating showrooms and middlemen, we keep our costs low - and pass those savings on directly to you.
