02D24E7D-67D3-4337-92AC-2BC3D8171DB7 Yes A72A1DAE-6539-461D-A000-4179652AA390
April Sale: $1,350 in savings
0 1
Copy Discount Code

Code copied successfully.

Full vs King Size Mattress: Similarities & Differences

Full vs King Size Mattress: Similarities & Differences

 Full size mattress is significantly smaller than a king size. Most people will weigh up the pros and cons of a full size vs king size mattress on the basis of whether they need to share the bed or not. Both these mattress sizes are on opposite ends of the spectrum when it comes to space, so it’s worth discovering all the features and benefits so you can make the best choice for your mattress upgrade.

Here, we cover all the key features of full size vs king size mattresses to make it easy for you to compare.

Mattress Dimensions

When you compare dimensions full and king size mattresses are worlds apart. A full mattress is 54” x 75” and a king is 76” x 80”. When you put these sizes side by side, you will quickly realize that a king mattress offers 22 inches of extra width and an extra 5 inches of length.

Full Size Mattress King Size Mattress
Mattress Dimensions 54" X 75" 76" X 80"
Price Cheaper More Expensive
Best for Young adults and single sleepers Couples and taller individuals who need more leg space
Room Size Small rooms and guest bedrooms Master bedrooms

Both of these mattress sizes offer unique sleeping benefits so it’s best to take a step back and assess your unique sleeping needs. Key considerations to make include your sleeping position, whether you share the bed, your budget, and importantly whether you have enough space in your bedroom.

How To Choose Between A Full Vs King Size

To get a good night’s sleep, your mattress plays a key role. Other than the type of mattress you choose, the size of your mattress can make a considerable difference to the quality of your rest. A full size bed, also referred to as a double bed, is quite versatile as it’s small and compact. Whereas a king size bed usually requires a master bedroom.


A bed that’s too big for your bedroom isn’t just a decor nightmare, it can also impact your sleep. So before you indulge and buy a huge bed such as a king size, take a look around your room and know exactly how much space you have to work with.

As a general rule of thumb, to fit a king mattress in your room, the surface area should be at least 12 x 12 feet. If your room is smaller than this, you may need to consider downsizing to a full or even queen mattress. When designing a bedroom, some people make the bed a focal point of the design. This is fine, however, it’s important to factor in the other pieces of furniture that might need to fit in the room. Not to mention, other decorative accents such as rugs, pillows, artwork, and mirrors - all these elements take up space so it’s important to get your mattress size right.

Full size beds are best suited for small bedrooms, teen bedrooms, dorm rooms, guest bedrooms, and studio apartments. King beds are usually reserved for the master bedroom or open plan living spaces that are not restricted by walls.


Starting your mattress shopping journey with a budget in mind will help you narrow down choices faster. When you compare full and king size mattresses side by side, the first thing you will notice is that there is a big difference in price. But the best thing is, you can always find a great mattress discount, especially if you buy online. Below, we break down the cost of each full size and king size Puffy mattress to help you make an informed decision about your mattress upgrade.

Full King
Puffy Original $1,649 $1,999
Puffy Lux $2,049 $2,449
Puffy Royal $2,899 $3,449

As you can see, you are spoilt for choice and you can buy an award-winning mattress whether your budget is big or small.

Other Mattress Sizes

Other Mattress Sizes | Puffy

When you’re mattress shopping, don’t just have your mind set on full and king size mattresses. You may miss out on discovering another mattress size that is better suited to your needs.

Sleepers in the US can choose between six standard mattress sizes: twin, twin XL, full, queen, king, and California king. Generally, people weigh up between full and queen sizes, and king and California king size beds.

A queen mattress is seven inches wider and five inches longer than a full mattress. Couples tend to upgrade from a full to a queen bed for extra space and comfort. If you have enough floor space in your bedroom, a queen bed may be a better option for you than a full size, especially if you change your sleeping position throughout the night. You can check out also our king vs queen bed dimension comparison.

When it comes to king beds, there are two styles to choose from. The standard king size mattress has a square shape and the California king size is shaped like a rectangle. California king mattresses work well for taller sleepers or master bedrooms that have a narrow design. Learn more and check out Puffy's king mattress size guide.

Puffy Full Size & King Size Mattresses

You can find a luxuriously comfortable and supportive Puffy mattress in all standard US mattress sizes including full size and king size. No matter how you like to sleep or what your unique sleep requirements are, there’s a Puffy that will guarantee you get better sleep than ever.

If you thought sleep couldn’t get any sweeter, you also get a whole stack of benefits when you choose to upgrade your mattress with Puffy. Not only will you get an incredible mattress discount, but you can also take advantage of our lifetime warranty, 101-night sleep trial, and free shipping and returns all year round.


King vs. Full: What's the Difference?

Full size mattresses are 22 inches smaller in width and 5 inches shorter in length. A full size mattress is 54” x 75” and a king is 76” x 80”.

How much bigger is a king than a full?

A king mattress is 22 inches wider and 5 inches taller than a full size mattress.

Is a full bed big enough for two?

Couples who share a full size bed get 27 inches of sleeping space each. This can be a tight fit for couples. Queen, king, and California king size mattresses are generally a better option for couples.


By now, you’ve probably got a clear idea about whether a full size or king size mattress is a better option for you. So the only thing you need to do now is select your favorite mattress. We make that easy with our mattress quiz. Simply enter your preferences and in under 60 seconds, we’ll match you with the perfect mattress!

Check out puffy mattress reviews, from real customers and see how we compare puffy vs nectar, and puffy vs purple.

Choose your Puffy Mattress

article ad savings icon $1,350 in savings

Unlock your ultimate sleep solution with Puffy.

Explore our award-winning Puffy mattress collection with these extra luxury benefits:

  • Award-winning comfort.
  • Lifetime warranty.
  • 101-night sleep trial.
  • Free shipping and returns.
  • 100% made in USA.