If you’re looking to upgrade to a California king mattress but don’t want to buy a new bed frame, you may be wondering whether it will fit in your existing king frame. The short answer is yes, a California king mattress will fit inside a standard king bed frame, but there are a few important considerations to keep in mind.

In this comprehensive guide, we’ll provide a detailed overview of the differences between king and California king mattresses, look at the pros and cons of using a California king with a king frame, discuss how to make it fit properly, and offer tips for getting the best sleep experience.

Key Differences Between King and California King Mattresses


One of the main differences between a King and California King mattress is their dimensions. A standard King mattress measures 76 inches wide by 80 inches long, making it wider but slightly shorter than a California King.

On the other hand, a California King mattress measures 72 inches wide by 84 inches long, making it narrower but longer than a standard King.

It’s important to note that the difference in dimensions may affect the fit of the mattress on a King frame. While a California King mattress may fit a King frame lengthwise, it may leave some gaps on the sides.

It is always recommended to check the specific measurements of both the mattress and the frame to ensure a proper fit.

Intended Use

Another factor to consider when choosing between a King and California King mattress is the intended use. King mattresses are more commonly used by couples who prefer a wider sleeping surface. The additional width allows for more space to spread out and move around during sleep.

On the other hand, California King mattresses are often preferred by taller individuals or those who value extra legroom. The additional length provides more space for taller individuals to stretch out comfortably without their feet hanging off the edge of the bed.


When it comes to price, King mattresses are generally more affordable compared to California King mattresses. This is mainly because King mattresses are more widely available and have been in production for a longer time.

The demand for California King mattresses is slightly lower, which can contribute to a higher price tag.

However, it’s important to note that prices can vary depending on the brand, materials used, and additional features offered by the mattress. It is recommended to compare prices and features from different retailers to find the best option that fits your budget and preferences.

Can a California King Fit in a King Frame?

It Will Technically Fit

If you are wondering whether a California King mattress can fit in a King frame, the answer is yes, it will technically fit. Both a California King and a King mattress have the same length, which is 80 inches. However, a California King mattress is narrower than a King mattress.

A King mattress measures 76 inches in width, while a California King mattress measures 72 inches in width.

But There Will Be Gaps

Although a California King mattress can fit in a King frame, there will be gaps on the sides. The difference in width between the mattress and the frame will result in empty spaces on either side of the bed.

These gaps can range from a few inches to several inches, depending on the specific dimensions of the frame and mattress.

This can lead to some issues, such as the mattress shifting or sliding around within the frame. It may also affect the overall aesthetic of the bed, as the gaps can be visually noticeable.

Tips for Proper Fit

If you are set on using a California King mattress with a King frame, there are a few tips to help ensure a better fit:

  • Measure the frame: Before purchasing a California King mattress, measure the dimensions of your King frame to determine the size of the gaps that will be present.
  • Use a mattress topper: Adding a mattress topper can help fill in some of the gaps between the mattress and the frame, providing a more snug fit.
  • Consider a mattress bridge: A mattress bridge or connector can be used to fill in the gaps between two separate mattresses, allowing them to function as a single unit in a King frame.

It’s important to note that while a California King may fit in a King frame, it is always recommended to use a mattress and frame that are specifically designed for each other to ensure the best comfort and support.

California King vs King: Pros and Cons

Pros of Using California King in King Frame

When considering whether a California King will fit a King frame, there are several pros to keep in mind. One of the main advantages is the extra length that a California King provides. With a California King measuring 72 inches wide by 84 inches long, it is 4 inches longer than a standard King mattress.

This additional length can be beneficial for taller individuals who require more legroom while sleeping.

Another advantage of using a California King in a King frame is the availability of a wider variety of mattress options. Many mattress manufacturers offer a larger selection of California King mattresses compared to King mattresses.

This means that you have more choices when it comes to finding a mattress that suits your specific comfort preferences and needs.

Additionally, if you already have a King frame and want to switch to a California King mattress, you may not need to purchase a new bed frame. In most cases, a California King mattress can fit onto a standard King frame without any issues.

This can save you the hassle and expense of having to purchase a new frame to accommodate the larger mattress size.

Cons and Drawbacks to Consider

While there are benefits to using a California King in a King frame, there are also some cons and drawbacks to be aware of. One of the main considerations is the width of the California King mattress. A California King measures 72 inches wide, which is 4 inches narrower than a standard King mattress.

This reduction in width may not be ideal for couples who prefer more personal space while sleeping.

Another drawback to using a California King in a King frame is the potential for gaps or overhangs. Since the California King mattress is longer, there may be a slight overhang at the foot or head of the frame.

This can make it more challenging to find bedding that fits properly and can result in a less polished overall appearance.

It’s also worth noting that California King mattresses tend to be more expensive than King mattresses. The larger size and less common availability can result in higher prices. Additionally, finding accessories such as sheets and mattress protectors in the California King size may be more difficult compared to the standard King size.

Making a California King Work in a King Frame

If you have a king-sized bed frame and are considering upgrading to a California king mattress, you may be wondering if it will fit. While the dimensions of a California king and a standard king bed frame are not the same, there are a few ways to make it work without having to invest in a new frame.

Use a Mattress Pad or Topper

One option to make a California king fit in a king frame is to use a mattress pad or topper. These accessories can add a few inches of extra width and length to your mattress, allowing it to fill the frame more effectively.

Additionally, mattress pads and toppers can provide extra comfort and support, making your sleep experience even better. Just be sure to choose one that is compatible with your mattress and provides the desired level of cushioning.

Add Foam to Fill Gaps

If there are gaps between your California king mattress and the king frame, you can use foam to fill them. Measure the gaps and cut foam pieces to fit. Insert the foam pieces into the gaps, ensuring a snug fit.

This will not only prevent the mattress from sliding around but also give it a more secure and stable foundation. Foam can be purchased from various retailers and is available in different thicknesses and densities to suit your needs.

Buy Adjustable Base or Floating Frame

If you prefer a more permanent solution and want to ensure a perfect fit, consider investing in an adjustable base or a floating frame. These options allow you to customize the size of your bed frame to accommodate a California king mattress.

Adjustable bases can be raised, lowered, or expanded to fit different mattress sizes, while floating frames are designed to support mattresses of various dimensions. These options may require a higher budget, but they offer the advantage of versatility and long-term use.

Keep in mind that while these solutions can make a California king fit in a king frame, there may still be some slight variations in size. It’s always a good idea to measure your frame and mattress before making any adjustments or purchasing additional accessories.

For more information on bed sizes and frame compatibility, you can visit websites like The Sleep Judge or The Sleep Foundation.

Getting Your Best Sleep with a California King

When it comes to getting a good night’s sleep, the right bed size and setup can make all the difference. One popular option for those looking for extra space and comfort is the California King mattress. But will a California King fit a King frame?

Let’s explore this question and other factors that can help you achieve your best sleep with a California King.

Mattress Firmness and Type

Choosing the right mattress firmness and type is essential for a comfortable sleep experience. The California King mattress is available in a wide range of firmness options, from plush to firm. It’s important to consider your personal sleep preferences and any specific health conditions that may require a certain level of support.

Memory foam, latex, and hybrid mattresses are popular choices for California Kings, providing excellent support and pressure relief.

Bedding and Accessories

Once you have your California King mattress, it’s important to pair it with the right bedding and accessories for optimal comfort. The size of a California King mattress is slightly longer and narrower than a standard King mattress, so it’s essential to use bedding specifically designed for this size.

This includes fitted sheets, duvet covers, and mattress protectors. Investing in high-quality bedding made from breathable materials can also enhance your sleep experience.

Additionally, consider accessories like pillows and mattress toppers to further customize your sleep surface. Memory foam pillows and mattress toppers can provide additional support and help alleviate pressure points, while cooling gel options can regulate temperature for a more comfortable sleep.

Room Size and Layout

Before purchasing a California King mattress, it’s crucial to assess your room size and layout. While a California King offers ample space for individuals or couples who prefer extra room to stretch out, it requires a larger bedroom footprint compared to a standard King mattress.

Measure your room dimensions and consider factors like doorways, windows, and other furniture to ensure that a California King will fit comfortably in your space.

It’s also important to consider the overall layout of your bedroom. A California King mattress may require rearranging or downsizing other furniture to accommodate its size. However, the spaciousness and luxury of a California King can create a relaxing and inviting sleep oasis when properly positioned in the room.


While it is possible to use a California king mattress in a standard king bed frame, keeping in mind the size differences, gaps, and fit will ensure you get the most out of your mattress purchase. Look for solutions like mattress toppers, foam, and adjustable bases to create a complete sleep system tailored to your needs. With some adjustments, you can enjoy the extra length of a California king mattress even with a king frame.

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