When shopping for a new bed, the array of options and features can be daunting. From choosing the right mattress to selecting the perfect frame style and considering ergonomic aspects, there are several crucial elements to consider.
Our guide provides detailed information on the dimensions of a king-size bed frame, highlighting the latest trends in design and comfort available in today's market.
Short Answer: King Bed 76” W x 80” L and California King 72” W x 84” L

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Thus, it would be good for you to focus on the sizes of beds and choose measurements that will fit in your preferred room. This is particularly true if you want to size up from the current bed in your room.
Common Bed Sizes
Some common terms that people will associate with beds today include full, queen, twin, and king-size beds.
The twin- and full-size beds are common with children who will get their first beds, mainly since both are elements of bunk bed frame structures.
These are excellent choices for children, as adults can also use them.
King and queen-size beds are popular among couples or young adults who want to upgrade from single-bed types.
Before learning about king-size bed frame dimensions, gaining insight into the other common bed sizes would also be good. Below is the guide.
- FASHIONABLE AND BEAUTIFUL:This bed frame adopts wrought iron frame,featuring a sleek and minimalistic design.The edges and corners of the bed frame have been carefully polished, making it easy to clean with a damp cloth.The bed frame's contemporary style will complement all your home decor, adding a touch of elegance and sophistication to your bedroom.
- Easy Assembly: Our queen size bed frame has clear instructions, included hardware, and a modular design for quick and hassle-free setup
- Adjustable Headboard - Our adjustable headboard offers a height range of 48.8-44.8 inches, suitable for mattresses between 8-14 inches. Filled with memory foam to enhance comfort, it provides a soft touch for a truly luxurious bed experience.
- Storage Headboard with Charging Station: Two Standard Plug Outlets and USB Ports with Cable Management 5. 9ft long power supply cord. Make charging and common small items such as phones, glasses, and books within easy reach
- Minimalistic Modern Design with Ample Under-Bed Storage: The clean lines and minimalist design of the bed frame contribute to a modern aesthetic, ideal for various bedroom styles. And it provides enough space for storage under the platform bed, optimizing space utilization.
Twin Size Bed Dimensions
Usually, a twin-size bed's frame dimensions are 38” W x 75” L. It’s the smallest size of the mattresses in the adult size category. A twin-size mattress would be ideal for a child who has outgrown their beds or a single adult.
It's a typical size for products such as bunk beds, daybeds, guestrooms, and more. Plus, it is also the smallest mattress size for many of the popular mattress companies today.
For sleepers on a tight budget, the twin-size mattresses offer the same luxury as when you have a large mattress.
Twin XL Size Bed Dimensions
The twin XL size mattress is 38” W x 80” L. While it may have the same width as the conventional twin, it's 5” longer in size. Thus, it's ideal for tall adults who don’t have adequate space for large beds.
Furthermore, not all sheets or comforters are available in the XL size. For this reason, ensure you double-check the dimensions to know the difference before investing.
Full-Size Bed Dimensions
A full-size mattress has 54” W x 75” L dimensions. It’s also commonly termed the “standard double.” The mattress is ideal for active sleepers who like to sprawl out or couples with small rooms. It may not be perfect for couples with children or pets.
Queen Size Bed Dimensions
The dimensions of a queen-size bed are 60” W x 80” L. it’s among some of the most common mattresses in the world. Why. The mattress is suitable for couples, active sleepers, or those who share beds with pets or children.
To ensure the mattress and its bed fit in your room, ensure you have at least 10’W x 10’L of space.
King Size Bed Dimensions
The dimensions of a King-size bed are 76” W x 80” L. It’s also incredibly comfortable and suitable for active sleepers and couples sharing beds with pets. To ensure this mattress fits in your room, it's recommended that you have at least 14’W x 14’L.
Obviously, a bed frame of any size can vary largely, because factors such as the style you consider are crucial. Beds such as the floating platform types tend to be wider and longer; you should expect the same with any bed with storage mechanisms.
More so, the sleight frames might be longer, which means they can accommodate the curved aspects of the head and footboards. They also share a common factor – the space available for the mattress to rest.
If a simple frame is all you need, you have to compensate by adding at least 3 inches to the measurements of your mattress. Why? You do this to ensure the frame has enough space, even if the exact dimensions will be available from the bed frame brand. Furthermore, the king-size beds (NOT California Kings) are the same length as queen-size beds, while the widths differ.
You should also note that a king is 16 inches wider than a queen, providing added space to spread out.
That said, when considering the added space required for the frame and mattress, you may have to get more than 18 inches of floor space to accommodate a larger size.
- Storage Headboard with Charging Station: Two Standard Plug Outlets and USB Ports with Cable Management 5. 9ft long power supply cord. Make charging and common small items such as phones, glasses, and books within easy reach
- FASHIONABLE AND BEAUTIFUL:This bed frame adopts wrought iron frame,featuring a sleek and minimalistic design.The edges and corners of the bed frame have been carefully polished, making it easy to clean with a damp cloth.The bed frame's contemporary style will complement all your home decor, adding a touch of elegance and sophistication to your bedroom.
- Easy Assembly: Our bed frame king size has clear instructions, included hardware, and a modular design for quick and hassle-free setup
- Built to last: Our steel frame beds feature larger sized tubing for exceptional sturdiness and durability, ensuring long-term support and stability.
- Quality Advantage: King bed frame made of high-quality metal and wood; heavy-duty support feet with plastic plugs to care for your floor; super sturdy and durable, supports up to 800 pounds
Split King Size Bed Dimensions
A split king mattress has two mattresses of the same size, each measuring 38” W x 80” L. This is the same size you would expect with a complete king mattress. Sleepers who prefer these types of beds often have different resting needs from their partner.
It’s a unique mattress design that ensures each user has a mattress that suits their specific needs without sacrificing their partner's needs.
Some Split King beds are joined at the bottom half of the mattress and only split at the top. This style is more for sleepers who do not have different sleep preferences since the interior of the mattress is the same throughout.
Some couples may also opt for a flippable mattress that offers a different firmness level on each side, such as the Layla mattress.
The advantage of this type of mattress is that you can use it on an adjustable frame, whereby each mattress can move independently. Also, it lets sleepers sit up or lie back, without affecting the sleep quality of their partner. That said, the main issue would be finding sheets that suit the mattress.
California King Size Bed Dimensions
A California King size mattress has 72” W x 84” L dimensions. It’s a mattress ideal for tall sleepers or those who want added length to their mattress. It's also highly spacious for active sleepers or couples that rest with pets or children.
Even if California mattresses tend to be 4 inches longer, they are narrower than a standard king mattress by 5 inches.
To ensure a California King mattress fits, ensure your bedroom is at least 14’W x 14’L.
- Motion Isolation Design —— The DIFAME California King size mattress features advanced motion isolation technology, combining high-density memory foam with individually pocketed springs. This California King mattress minimizes motion transfer, allowing undisturbed sleep even if your partner tosses and turns, ensuring a peaceful night
- Elegant Home Decor: This Bedsure california king bedding set features a pinch pleat design with a geometric pattern, adding a touch of sophistication to any bedroom. Give the gift of elegant coziness to your loved ones, whether it's for Mother's Day, Valentine's Day, Christmas, or just to show you care.
- FOR GREAT SLEEP AND A CLEAN PLANET – Featuring our patented zoned pressure relief technology designed to help reduce aches and pains through the night, this new version ships in a smaller box for a reduced carbon footprint
King Size Bed Frame FAQ?
Usually, mattresses are similar when selecting the corresponding frame size. That said, some frames (the ones with headboards and footboards) may be slightly larger than the mattress. The modern bed frames with shelves on the headboard, sleigh bed frames, and wide platform beds might require more space – when compared to the conventional bed frames. It would be good to measure your room's dimensions before investing in a bed frame that suits your needs.
No, while a California king is longer than the conventional king, it’s also 4 inches narrower. It may be smaller in width, but its length is perfect. Even if Cal kings are often more luxurious than the standard kings, they are an excellent alternative for people who want added legroom.
Yes, the headboards tend to be 5 inches wider than the beds. For instance, a king-size headboard might be 82 inches wide and 5 inches wider than a king-size mattress.
Types of King Beds
King-size beds have changed significantly over the past few years. Nowadays, there are several variations to this standard type of bed to suit the needs of different users. The typical sizes include:
Split King
The standard king is an excellent mattress for couples enjoying personal space during rest. It's also a large bed that can accommodate one or two kids – perfect for parents with pets or kids.
The split kings are excellent choices for couples that enjoy personal space but have varying sleeping needs. A split king mattress is just an integrated twin XL mattress.
Each sleeper has over 40 by 80 inches of space on the side section of the bed. A split king also lets both sleepers select their preferred levels of comfort and support for the side structure of the bed.
California King
A California king mattress also has unique dimensions. It tends to be 4 inches longer and 4 inches when compared to the standard king. The added length provides room for the tall sleepers.
Averaging 72 x 84 inches, the California King makes up for the lost space in width with its extra length. It’s the longest among most standard-size beds.
Since a California king may not be as wide as the king, it may not be suitable for families with many children. The California Kings are also available in split types, which lets you choose a mattress type for specific needs.
Finally
The quality of your sleep is essential, and this is why you need to invest in the right bed type for your needs. The right bed can do a lot for your interior décor. Thus, this guide has been all about how wide a king-size bed frame is. Why? It's among some of the most popular bed frame types on the market today.
Thus, it's good to consider the size dimensions before getting a king-size bed frame. Critical factors to consider include the mattress size, the number of sleepers, the size of the room, and more.