How Many Cubic Feet Is A King Size Mattress?

Understanding the Dimensions of a King Size Mattress

To give a precise answer, a standard king size mattress typically has dimensions of 76 inches in width and 80 inches in length. When calculating the volume, it’s important to consider the thickness of the mattress as well. A common thickness for a king size mattress is around 12 inches. Given these dimensions, a king size mattress would have a volume of approximately 42.2 cubic feet. This is derived from the formula for volume in a rectangular prism, which is length x width x height. Specifically, the calculation is 76 inches x 80 inches x 12 inches, converted to cubic feet (where 1 cubic foot = 1,728 cubic inches).

Breaking Down the Math

Step-by-Step Calculation

To better grasp how this volume is derived, let’s go through the calculations in detail. We start by multiplying the length, width, and height in inches to get the volume in cubic inches:

76 inches (width) x 80 inches (length) x 12 inches (height) = 72,960 cubic inches

Since 1 cubic foot equals 1,728 cubic inches, to convert cubic inches to cubic feet, we divide the total cubic inches by 1,728:

72,960 cubic inches ÷ 1,728 cubic inches per cubic foot ≈ 42.2 cubic feet

So, a king size mattress that is 12 inches thick has a volume of about 42.2 cubic feet.

Factors Affecting Cubic Feet Calculation

Thickness Variations

While 12 inches is a common thickness, mattresses can vary significantly in thickness. They can range from slim models at around 8 inches to the more luxurious, plush models reaching up to 18 inches or more. It’s essential to adjust the calculations based on the exact thickness of your mattress to determine its volume accurately.

For example:
– An 8-inch thick king size mattress:
76 inches x 80 inches x 8 inches = 48,640 cubic inches ÷ 1,728 ≈ 28.1 cubic feet

– An 18-inch thick king size mattress:
76 inches x 80 inches x 18 inches = 109,440 cubic inches ÷ 1,728 ≈ 63.4 cubic feet

These variations illustrate how mattress thickness can affect the overall volume significantly.

Material and Construction

The material and internal construction of a mattress can also affect its overall volume and weight. Different types of foams, coils, and other materials may have varying densities and structural properties. Memory foam mattresses, for example, might be denser and therefore heavier than innerspring mattresses, even with the same dimensions.

Memory foam mattresses often comprise multiple layers with different densities, contributing to the overall volume in nuanced ways. Hybrid mattresses, combining coils and foam layers, add another layer of complexity to the volume and weight calculations.

Practical Implications of Knowing the Volume

Transportation and Shipping

Understanding the cubic feet of a king size mattress is crucial when considering transportation or shipping. Mattresses are often shipped rolled up and compressed to save space, but knowing the original volume helps in planning moving logistics.

If you’re moving, knowing the exact cubic feet can help when renting a truck or hiring a moving company. Given the volume, you can determine how much space the mattress will occupy, ensuring you have sufficient room for other furniture and items.

Storage Needs

When storing a mattress, knowing the volume can aid in selecting the appropriate storage unit. Whether you need temporary storage while moving or long-term storage for a spare mattress, calculating the space requirements accurately can save time and money.

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Storage units typically offer various sizes, and understanding how much space a king size mattress will need ensures you choose a unit that can accommodate it along with other belongings if necessary.

Comparing King Size with Other Mattress Sizes

Queen Size Mattresses

For context, a queen size mattress measures 60 inches in width and 80 inches in length. Using a thickness of 12 inches as a standard:

60 inches x 80 inches x 12 inches = 57,600 cubic inches ÷ 1,728 ≈ 33.3 cubic feet

A queen size mattress has a smaller volume compared to a king size mattress, which can be significant when considering space, storage, or transportation.

California King Mattresses

A California King, another popular size, measures 72 inches in width and 84 inches in length. With a 12-inch thickness:

72 inches x 84 inches x 12 inches = 72,576 cubic inches ÷ 1,728 ≈ 42.0 cubic feet

Interestingly, while the dimensions differ, the volume of a California King is quite close to that of a standard King. This is mainly because the California King is narrower but longer, balancing out the overall volume.

The Role of Mattress Volume in Purchasing Decisions

Room Size and Layout

One often overlooked aspect when buying a mattress is how its volume impacts the room’s overall layout and usability. A king size mattress, being bulkier, takes up more floor area, which can influence furniture placement and walking space. Ensuring that your bedroom can comfortably accommodate a king mattress without feeling cramped is critical for maintaining a functional and aesthetically pleasing space.

Frame and Bedding Adjustments

Another factor is the frame and bedding. A king size mattress requires a compatible bed frame, box spring, and appropriately sized bedding. Knowing the volume and dimensions helps you ensure that every accessory fits perfectly. Investing in the right accessories complements the mattress and extends its lifespan by providing adequate support and comfort.

Health and Comfort Considerations

Pressure Relief and Support

The volume of a mattress can also indirectly impact its ability to provide pressure relief and support. Thicker mattresses generally have more layers of various materials, offering better contouring to the body’s curves and alleviating pressure points. This is particularly important for individuals with specific health needs or preferences for certain sleep positions.

Temperature Regulation

A mattress’s thickness and material composition can influence temperature regulation. Mattresses with multiple layers, including cooling gels or breathable materials, tend to have a bulkier volume. These features help maintain a comfortable sleeping temperature, crucial for a restful night’s sleep.

Finishing Thoughts

While the simple answer to “How many cubic feet is a king size mattress?” is approximately 42.2 cubic feet for a standard model, the actual volume can vary based on thickness and material. Understanding these details is more than just a mathematical exercise; it has practical implications for transportation, storage, room layout, and overall sleep comfort. By comprehensively considering these factors, you can make better-informed decisions when purchasing, moving, or storing a king size mattress, ensuring it meets all your needs and expectations for optimal sleep quality.


  • Dominic Johnson

    Hello! I’m Dominic Johnson, the whimsical wizard behind the world of sleep at With a background in Sleep Psychology and a quirky love for all things dozy and dreamy, I bring a sprinkle of fun to bedtime blues. I've spent my career unraveling the mysteries of the Sandman, turning dense science into cozy bedtime stories. When I'm not buried in research papers or testing the fluffiness of the latest pillows, I'm usually found playing impromptu lullabies on my old guitar for my twin daughters or teaching my labrador, Rocket, new tricks. My approach to sleep is simple: blend science with a touch of magic and a hearty laugh.

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