Casper

California King Mattresses

Shop award-winning California king size mattresses for great sleep, at an even greater price.

Review Rating: 4.3 stars
(1181)

Wave Hybrid

From
$2,895.00
Firmness: Medium
The best of support for less aching and more sleeping.
Ergonomic Support
Firm Support
Standard Advanced
Cooling Technology
Advanced Cooling
Standard Advanced

Review Rating: 4.6 stars
(91)

Nova Hybrid

From
$2,295.00
Firmness: Medium
For those dreaming of cloud-like comfort and support.
Ergonomic Support
Firm Support
Standard Advanced
Cooling Technology
Moderate Cooling
Standard Advanced

Review Rating: 4.4 stars
(21275)

Original

From
$1,295.00
Firmness: Medium-Firm
The mattress that started it all with the perfect balance of support and cooling.
Ergonomic Support
Soft Support
Standard Advanced
Cooling Technology
Regular Cooling
Standard Advanced

Review Rating: 5 stars
(5)

Element pro

From
$995.00
Firmness: Medium-Firm
Casper comfort and support at a cozy price.
Ergonomic Support
Soft Support
Standard Advanced
Cooling Technology
Regular Cooling
Standard Advanced

How big is a California King size mattress?

A California King mattress is 84 inches long and 72 inches wide.

Mattress sizing chart

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.

Ready for the coolest night of your life?

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.

Who should get a California King Size Bed?

A Treat for the Tall

A Treat for the Tall

The Cal King is 84 glorious inches long - slightly longer and narrower than a standard King.
Master Bedroom Ready

Master Bedroom Ready

The California King bed is ideal for a spacious master bedroom - think 13 by 13 feet.
Splendid for Sprawling

Splendid for Sprawling

The Cal King offers a luxurious amount of space. Perfect for couples with kids or pets, or those who like to sprawl out.

Premium comfort with "just right" firmness

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.

Free shipping & returns.* Great rest guaranteed.

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.

Which Casper California King Hybrid mattress is right for you?

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.

The Wave Hybrid
Wave Hybrid Mattress

The Wave Hybrid

The Wave Hybrid combines the powers of springs, gel and memory foam for the supreme dream state. The five layers give you the most support using innersprings for added lift, and foam and gel for Hyper-Targeted support to provide contouring spine alignment.

The Nova Hybrid
Nova Hybrid Mattress

The Nova Hybrid

Our Nova Hybrid features a luxuriously soft top layer making it our most plush mattress. It features hundreds of resilient springs, added lift, airflow, and a bit of bounce to have you sleeping in the clouds.

The Original Hybrid
Original Hybrid Mattress

The Original Hybrid

Our award winning Original mattress, upgraded. The Original Hybrid combines the best of both worlds with resilient springs as the base for added lift and our proprietary foam for pressure relief. The "just right" feel is now even better.

Which California King foam mattress is right for you?

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.

The Original
The Original

The Original

Our award winning Original king bed was engineered using feedback and data from customers like you. If sleeping on a cloud sounds good, consider this your sweet spot.

Frequently Asked Questions

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.

How Casper keeps prices low and quality high

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.

Shop the Original California King Mattress