California King Mattresses

Longer in length, Cal King mattresses offer the best in comfort, support, and cooling with the extra space you need, whether you're tall, share a bed with pets, or have a narrow bedroom.

Is a California King Size Mattress Right for You?

A California King mattress, aka Cal King mattress, is longer and more narrow than a traditional king size bed, but still approximately 12 inches wider than a Queen bed.


Are you, or someone who shares your bed with you, a taller person? Do you have fur babies that sleep at the foot of your bed? Do you want room to stretch out but have a narrower bedroom? If you answered yes to any of these questions and you are finding yourself tired of feeling cramped and uncomfortable in bed and longing for more space to stretch out and relax on, you might want to consider an upgrade to a California King size mattress.


Check out some of our frequently asked questions about the Cal King below.


What size is a California King mattress?

Approx. Dimensions: 72” X 83.5” (width x height) / 6,012 sq in / 41.7 sq ft


A Cal King size mattress is the longest offering at around 83.5 inches. Both a King size bed and Queen size bed are approximately 79.5 inches long. A Cal king is about 12” wider than a Queen and 4” narrower than a King.


What is the difference between King and Cal King?

Cal Kings are longer and narrower. The measurements of a regular King are approximately 76 inches in width and 79.5 inches in length. The measurements of a California King are a bit longer and not as wide, the dimensions are approximately 72 inches wide by 83.5 inches long.

  • King Size Mattress Dimensions: 76″ Wide x 79.5″ Long
  • California King Size Mattress Dimensions: 72″ Wide x 83.5″ Long

Read more about the King vs California King differences, here.


How much do California King sized mattresses cost?

A quality Cal King can range anywhere on average from $950 to $5,000. It all depends on the materials used to construct the mattress as well as the benefits it offers.


Should I buy a California King size mattress online or in-store?

It really comes down to your own personal shopping preference. Some people were born in the age of the internet and online shopping is what they know and are more comfortable with, while others prefer being in-person to shop so they can touch, feel and see the exact product they are investing in. So, there is no right or wrong way to shop for a mattress.


Click here to find a Serta store near you.


Does Serta offer customizable options on Cal King mattresses?

Serta’s innerspring, memory foam, mattress-in-a-box, and hybrid mattresses are all available in California King. Also, most mattresses have different cooling and firmness level options to choose from. So no matter your sleep preference and preferred sleeping position (back, stomach and side sleepers, Serta has a mattress model you’ll fall in love with.


Do Serta California King mattresses need a box spring?

The short answer, no. All you technically need is a hard, flat surface to provide your mattress with the proper support. Some bed frames however may require them. Read more, here.


Do king sized sheets fit on a cal king bed?

Because a Cal King is longer and narrower than a King, fitted King sheets don’t fit properly on a Cal King. However, king-size flat sheets, comforters, and bedspreads can usually be swapped between a standard King and Cal King.


Can I expedite my order?

We do not have an expedited delivery option at this time. Our site will provide the best delivery estimate at checkout.

Do you ship internationally?

Directly on our website, we only ship within the United States, to the lower 48 states. At this time we do not offer shipping to Alaska or Hawaii.

Do you offer financing?

Financing is available directly through our website. We have partnered with Affirm to offer financing or pay-over-time options for our customers. At checkout, you will be given the option to pay through Affirm. If approved, you will be given loan options for 3, 6, or 12 months. All interest is provided up front, there are no hidden fees, and only a soft credit check is done through Affirm's system for approval. After you've confirmed your choice, you will be redirected back to our website to complete checkout.

Affirm only requests a soft credit check for approval, so the credit inquiry won’t affect your credit score. Once you've selected your financing term, you will be redirected back to the website to complete your purchase.

For returns and cancellations, refunds will be processed through Affirm and posted to your Affirm account. Refunds will be processed within 3-10 business days. Keep in mind the interest charge will not be refunded.

Please note that financing through Affirm is not available in West Virginia and Iowa.

What is the difference between ordering from .com and another retailer?

When you place an order through, you are backed by the 120-Day In-Home Trial. We know ordering a mattress online can be intimidating, so we want to take the risk out of it for you with the in-home trial that allows the perfect amount of time to test the mattress and accessories in your home and make sure it's right for you. If you decide it is not the right fit, we make returns easy and free.

Serta products are sold at many different retailers through the United States. Our goal is to be able to serve our sleepers where they feel the most confident purchasing their Serta products. Many retailers will have products on display for sleepers to test out before making your decision, and may offer different pricing or promotional advantages for buying directly through a retailer. Retailers may also have different models than what you see directly on the website.

Regardless of where you purchase, you can be confident you are getting a quality Serta product.

Do you make custom sizes?

We are unable to provide custom sizes at this time. For now, we carry industry standard sizes of twin, twin XL, full, queen, king, and California king.

Why buy Serta online?

120-Day In-Home Trial

Experience the mattress in your home for up to 120 days. If you’re not completely satisfied, you can exchange or return it for a refund.

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You should be able to rely on the quality of your rest night after night. That’s why every Serta® mattress is backed by Serta’s 10-year limited warranty.

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Free Shipping & Returns

All mattresses and foundations ship free and feature free returns when you order directly from

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All Serta mattresses are designed and assembled in the USA, leveraging our 85 years of manufacturing expertise.

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certipur-us® certified

Rest easy knowing Serta uses only CertiPUR-US® Certified Polyurethane Foam.

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Try in stores

Want to test our products before you buy? Our Sleep Ambassadors will offer you a personalized, no-pressure in-store experience. Don't live near a Serta shop? Learn where else you can find us!