King vs. California King: What’s the Difference?

A king or a Cal king size is a common choice when you’re shopping for the best mattress. Both are large enough for two people to share without sleep disturbances. However, the two are similar enough that it can be difficult to decide between them.

Browse our selection of California King Size Mattresses.

What is a King Mattress?

A king size mattress is the largest standard bed size. It’s 76 inches by 80 inches with 6,080 total square inches of surface area, equal to two twin XL mattresses placed side by side. There’s room enough for two people and even some space for a child to co-sleep with their parents.

Because a California king mattress is often called the Western king, a king size mattress is sometimes referred to as the Eastern king.

Pros of a King

• Plenty of sleeping space
• Makes a master bedroom feel more luxurious
• Split king option for more customization

Cons of a King

• Costly
• Too big for smaller bedrooms
• Bulky and heavy

Many shoppers seek a king size mattress because they want a luxury mattress. It’s also common for sleepers to associate plushness with top-of-the-line comfort, so they shop for a king bed they can comfortably sink into after a long day. When it comes to luxurious soft mattresses, it’s difficult to beat the AS5 Hybrid.

There are four distinct layers inside the AS5 Hybrid. All of its foam layers are certified safe by CertiPUR-US®, while the main support core is a base of pocketed coils.

The top foam layer is Bio-Pur® memory foam, an upgraded version of traditional memory foam. Not only does this material provide most of the bed’s soft cushion, but it’s designed to respond faster and stay cooler than traditional memory foam would. These qualities are due to Bio-Pur® foam’s production, which substitutes traditional key ingredients with plant oils.

Next is Active Flex, a material designed to deepen the bed’s plush feel while buoying the body to minimize unwanted sinkage. Many poorly built soft mattresses feel too conforming, causing sleepers to bow too far into the bed.

The support core is pocketed coils on a firm foam base. These two layers work together to provide bouncy support and a responsive structure. The pocketed coils also feature edge support, making it easier for someone with a medical condition that restricts movement to slip out of bed in the morning.

The AS5 Hybrid comes with a 100-night sleep trial and a 20-year warranty, same as every other Amerisleep mattress.

What is a California King Mattress?

A California king size mattress has 4 inches of extra length than a standard king bed, but it’s also 4 inches narrower than a king. It gives taller people over 6 feet of room to stretch out.

A California king bed offers slightly less surface area than a king since it comprises 6,048 square inches.

Pros of a California king

• Long enough for tall people to rest on comfortably
• Couples can sleep close
• Excellent addition to a master bedroom

Cons of a California king

• Expensive
• Bed accessories can be challenging to find
• Massive and hard to move

How Should I Decide Between the Two?

King and California king mattresses are similar enough that it can take a close examination to determine which is the better mattress for you. You want to consider your bedroom size, budget, body type, and personal preferences.

Room Size

King and California king mattresses can take up too much space if your bedroom is less than 12 feet by 12 feet. However, your room’s exact dimensions can influence which one is better for you. If you’re looking for a narrower bed so that you have more wall space for furniture and decor, a California king might be more space-efficient.

Pricing

King and California king mattresses are the most expensive mattress size because they both contain a lot of material. They often have similar rates, and some brands even sell them at the same price. However, if one does cost more, it’s usually the California king mattress since they’re not as widely available.

Bedding Considerations

Though king mattresses and California king mattresses have the same perimeter (312 inches), a fitted bed sheet or mattress protector for one will not fit the other. Loose bedding such as blankets and comforters can be used interchangeably.

King size bedding is relatively easier to find than California king size bedding. Since it’s more commonplace, king size bedding is often more affordable as well.

Individual Height

You don’t want to be too tall for your mattress and have your feet dangling over the edge, do you? That’s why we tend to recommend a California king mattress for anyone who’s more than 6 feet tall. If you’re under 6 feet, a standard king should suit you just fine.

Couple Preferences

King mattresses are often bought to share with someone else. If you plan on sleeping with a partner and share a mattress for couples, it’s a smart idea to discuss how much space each of you needs for a good night’s rest.

Is one of you a hot sleeper, or do you move restlessly in the night? Then you might want a king mattress for a few extra inches of wiggle room.

Upgrading to a California king mattress often requires a significant investment. For some shoppers, a larger mattress may seem out of reach, but it doesn’t have to be. When it comes to budget mattresses, the Vaya Mattress is designed to provide pure comfort at an affordable price.

The Vaya Mattress has a simple two-layer design, consisting of specialty comfort foam and support foam. The top layer was engineered to cradle the body and feel more responsive and lighter than traditional memory foam. The base foam increases the mattress’s durability while helping sleepers maintain a healthy spine alignment.

There’s also the Vaya Hybrid, a bouncy counterpart to the original Vaya Mattress. Hybrids often cost a significant amount due to their production costs, but the Vaya Hybrid relies on a minimal design with top-shelf materials to deliver affordable comfort.

Every Vaya Mattress is backed by a 100-night sleep trial and a 10-year warranty.

What are Split Kings?

A split king mattress is technically two mattresses placed side by side, as our twin XL vs split king mattresses. These mattresses are the same size as a twin XL mattress, measuring 38 inches by 80 inches. Manufacturers sell split king mattresses to help couples sleep better, letting each partner customize their half to their preferences.

Split Cal king mattresses also exist, but they are less common than a standard split king. Accessories for a split California king mattress are even harder to find than split king bedding.

Other Bed Sizes

King mattresses aren’t suitable for every bedroom. Maybe you’re living alone in a small studio apartment and need a bed that doesn’t take up a lot of floor space. Perhaps you’re shopping for your child’s first mattress after they’ve outgrown their crib.

There are four standard mattress sizes you can consider besides a king or a California king— twin, twin XL, full, and queen.

Twin

Twin mattresses are only 38 inches by 75 inches, which is enough space for most people to get a good night’s rest. They’re an excellent choice for a child’s room, a small bedroom, or a guest room.

Twin XL

A twin XL mattress is just as wide as a standard twin bed, with an extra 5 inches of length. Many parents choose a twin XL over a twin to allow for a teenage growth spurt. Colleges often choose twin XL frames for their dormitories to accommodate taller people.

Full

A full mattress, sometimes called a double bed, is 54 inches by 75 inches. That’s 16 more inches of width than a twin mattress. We recommend full mattresses only for solo sleepers, as most couples would not have enough sleeping space if they shared the bed.

Queen

If you’re considering a mattress for two and a king is too big for your bedroom, a queen size mattress might be just what you need. A queen measures 60 inches by 80 inches, giving each partner about 30 inches of sleeping space.

A queen mattress is also a popular choice for solo sleepers who want space to stretch out their limbs or simply desire a bigger bed. If your bedroom is at least 10 feet by 10 feet, you should have enough space for a queen mattress and some bedroom furniture.

If you’re trying to decide between a king or a queen size mattress, check out our king vs. queen comparison guide.

Saving on King Size Mattresses

The price tag of a traditional king or California king size mattress can be intimidating for some shoppers. One way to save money is by considering online mattresses instead of ones you find at a traditional showroom. Online retailers have fewer costs to meet and usually pass the savings onto customers.

We also recommend reading through our guide on mattress sales that happen throughout the year:

• Best Memorial Day Mattress Sales
• Best 4th of July Mattress Sales
• Best Labor Day Mattress Sales
• Best Columbus Day Mattress Sales
• Best Black Friday Mattress Sales
• Best Cyber Monday Mattress Sales

Frequently Asked Questions

How much bigger is a Cal king than a king size bed?

Technically, a California king mattress is smaller than a standard king. A king mattress offers 6080 square inches of space, while a California king is 6048 square inches. That’s only a difference of 32 square inches, but it still means a California king features less space.

As a reminder, while a California king mattress is 4 inches longer than a regular king, it’s also 4 inches narrower.

Do two twins make a king?

No, it is two twin XL mattresses shoved together that form a king size bed.

What is the largest duvet size available?

You can find duvets and comforters in sizes that exceed even a king mattress. Some are made for oversized mattresses, such as the emperor or the super king.

Is there a bigger bed than a king size mattress?

Yes. A Wyoming king, Texas king, and Alaska king are all oversized mattresses that are larger than a standard king.

• Wyoming king: 84 inches by 84 inches
• Texas king: 80 inches by 98 inches
• Alaska king: 108 inches by 108 inches

Why is it called a California king?

The California king mattress was invented in Los Angeles, California.

What’s the Right Size for Me?

Both a king and a California king mattress are large beds that work well in a master bedroom. A king size is wider while a California king is longer.

King sizes are the more popular choice, but which is the better mattress for you depends on your sleep needs. If you want some space to yourself while still sharing a bed, a king mattress might be the smarter choice. And if you need legroom, you might want to choose a California king mattress.