Fact checked by Jonathan Eilenberg, CPE
Jonathan Eilenberg, CPE
Jonathan Eilenberg is a Certified Professional Ergonomist who is a Senior Ergonomics Engineer at Casper with over 6 years of experience in occupational injury prevention.
When purchasing a bed frame, remember that its dimensions can increase by 1 to 6 inches depending on the design. A traditional king size mattress is 76”x80”, so a typical king size bed frame is 78-82”x82-85”.
Creating a sleep sanctuary in your bedroom starts with buying the right mattress. And for some, that means having ample sleeping space.
For many, a King or a California King is all the space they need. King size bed frame dimensions are around 78-82 inches by 82-85 inches to accommodate a 76-by-80-inch mattress.1 California King size mattresses are 72 by 84 inches,1 so Cal King bed frames are usually 72-79″x86-89″. As the largest standard-sized mattresses available, they offer ample room for space-loving sleepers.
But if bigger is better for you, there are six mattress sizes larger than a King or California King, from 84 by 84 inches2 to a whopping 9 by 9 feet.1
Whether you sleep alone or pile the whole family into one bed, our size guide is here to help you find the right oversized mattress for your most comfortable night’s sleep.
Bigger beds, starting with queens and standard king size mattresses, became popular post-World War II.3 Economic prosperity, along with larger houses, made bigger beds more appealing.2 An increase in average height may have also played a part (only 4% of American men were six feet tall or taller in the 1900s. By 1959, 20% of American men were six feet tall).2
Today’s mattress market has made purchasing beds larger than standard sizes easier and more affordable, along with the proper size bedding.
King size bed dimensions are 76 by 80 inches,1 which translates to approximately 6 feet 4 inches by 6 feet 8 inches. Standard King size bed frame dimensions typically run 78-82 inches by 82-85 inches, which may include a box spring or a mattress foundation for the bed to sit on, legs to lift the bed and its frame off the floor, and a headboard for a decorative and supportive element.
There are two types of king beds and four “oversized” king mattress options available on the market today.
Two sizes are considered the largest standard mattress options:
The four oversized mattress sizes include1:
King size beds can be a great choice for couples who need plenty of space to sleep. So what is a Split King mattress? For couples who require space and drastically different mattress types, a Split King could be a great choice. The Split King has the same dimensions as a standard King4 bed but is made up of two individual mattresses (roughly the size of a twin mattress). These beds allow couples to choose the exact mattress for their specific needs while still sharing a bed.
Couples looking to take their comfort to the next level might even consider an adjustable bed frame, which can raise and lower certain sections of the bed to create the optimal sleeping environment for each person.
A California King (affectionately known as a Cal King) is very similar to a standard King, though it is slightly more narrow and a little taller. These dimensions (72 by 84 inches)1 make the Cal King a rectangular shape rather than a square. A bed frame for a Cal King bed is generally 72-79″x86-89″.
You may want a Cal King if:
Learn more about the differences between a California king vs king mattress in our blog.
The Wyoming King is the smallest of the oversized mattresses. It’s the size up from a Cal King and, at 84 by 84 inches,1 goes back to a true square shape rather than a rectangle. A bed frame for this type of king should at least be 85”x85”.
A Wyoming King is a great choice for:
Though the Texas King is narrower than the Wyoming, it is significantly longer than the Wyoming and the Cal King: 14 inches longer, to be exact.
Choose a Texas King if:
Want more? Check out our guide on the Texas king vs California king mattress.
Alberta king mattress dimensions run 96 by 96 inches1 — that’s 8 feet by 8 feet. Therefore, your bed frame size for an Alberta king should be at least 97”x97”.
You’ll like an Alberta King if:
The Alaskan King is the biggest bed size on the market today. At 108 by 108 inches (translated to 9 by 9 feet)1, it dwarfs the standard King. Based on those measurements, an Alaskan king bed frame should be at least 109”x109”.
You’ll like an Alaskan King if6:
There are a number of reasons why you may want a bigger bed. Maybe you enjoy the feeling of spreading all the way out without dangling limbs off the side, or you co-sleep with partners, kids, and pets and don’t want to feel crowded out.
Here are a few other reasons why a King bed or larger could be a good choice for you:
Before you go shopping for your new King or oversized mattress, there are a few things you’ll want to consider:
There are many considerations that can go into picking a mattress. And if you believe that bigger is best, then a King size or oversized mattress could be just what you need.
King size bed frame dimensions offer sleepers ample space, even when co-sleeping with partners, children, and pets. They’re incredibly versatile for people with different sleep patterns and positions, giving every sleeper the room they need to stretch out and roll around without disturbing others.
People who are larger-bodied or have physical limitations that require more room to maneuver themselves may find a King bed or oversized bed beneficial and more comfortable than standard bed sizes.
Ready to elevate your sleep? Shop award-winning mattresses from Casper, with a variety of sizes to suit your needs.
At Casper, we focus on designing quality beds that will last you for years, all while providing the comfort you deserve. Shop our variety of mattress styles, along with accessories like pillows, bedding, frames, foundations, and more.
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