Detailed Mattress Comparison

A king size mattress is bigger than a full size mattress, both in length and width. . King size mattresses are 5 inches longer and 22 inches wider than a full size bed.

Because of the extra length and width a king size mattress provides, it is ideal for couples who prefer having a lot of individual space, or share their bed with a child or a pet. Full size mattresses on the other hand are designed for single sleepers, college students, and teenagers. 

Here is a snippet of the differences between a king and full size mattress. 

Parameters King Mattress Full Mattress
IN: 76”x 80”x 14”
FT: 6.3′ x 6.7′ x 1.7′
CM: 193 x 203 X 35.6
IN: 54” x 75” x 11”
FT: 4.5′ x 6.25′ x 0.92′
CM: 137.16 x 190.5 x 27.94
Price $1199 $899
Bed Size (Inches) 76″ x 80″ 54″ x 75″
Ideal Room size (Feet) 12′ × 12′ 10′ × 12′
Comfortably Fits
  • Couples with pets or children
  • Couples sleeping in the master bedroom
  • Single sleepers
  • Students or teenagers
  • Adults who live in studio apartments
Full vs King Mattresses with Dimensions

What Is a King Size Mattress?

King-size mattresses measure 76 inches in length and 80 inches in breadth.  A king size mattress is larger than queen and full size mattresses and is ideal for couples who wish to have that extra sleeping space or those who share their bed with a child or pets.

 A king size bed equals two twin XL mattresses put together and fits perfectly in a master bedroom or rooms larger than 12 by 12 feet.


  • Best suited for couples
  • Ideal fit for master bedrooms
  • Apt for couples who share their bed with a pet or a child


  • Large in size and are not suitable for smaller rooms
  • Heavy and cannot be moved easily 

What Is a Full Size Mattress?

A full size bed is 54 inches wide and 75 inches long. Also known as double beds, full size mattresses are smaller than king size beds. They are ideal for single sleepers, teenagers, adults, and students who have limited space. It is best suited for studio apartments and small homes where there is a space constraint.


  • Best suited for singles
  • Compact and ideal for small rooms
  • Cost-effective


  • Not enough space for tall people 
  • Not suitable for couples

Things to Consider Before Deciding Between King Size vs Full Size Mattress

Room Size

King-size beds are best suited for master bedrooms with ample space. A king size bed offers a lot of surface area making it convenient for a family with pets or children. 

Full size mattresses fit well in bedrooms that are 10 by 12 feet or larger. They are smaller compared to a queen mattress but offer a cozy abode for adults who like to sprawl out. It is ideal for a studio apartment, children’s room, guest room, or even slightly spacious dorm rooms.


A king size bed can cost $1000 or more while a full bed can cost $700 or more depending on the brand and the material you choose. The price difference can range from $500 to $3000 with a king size mattress being the more expensive one because of its size. 

Bed Size

As far as the bed size is concerned, a full-size mattress requires a bed that measures 54 inches by 75 inches to fit a single sleeper comfortably. A king size mattress requires a bed that is 76 inches by 80 inches and  large enough for the entire family to fit in comfortably. 

The size of the beds may vary based on the specific type of brand you opt for, which is an important consideration while choosing between king vs full size mattresses.  


For a couple taller than 6 feet a  king-size mattress that is 80 inches long should offer the extra length needed to sleep comfortably. If you are shorter than 6 feet and sleep alone, a full size mattress is the better choice for you. For couples that are shorter than 6 feet a queen size mattress may also work well may. 


A wide range of accessories can be included when you opt for a king-size bed. From having 2 to 3 pillows to a few cushions, there are no restrictions as far as accessories are concerned. This, however, is different for full-size beds as you can have only one or two pillows with a blanket. Accessories for a king size bed, like sheets, cover, and duvets will cost more as they are bigger in size. 

More on Mattress Sizes

Choosing Between King vs Full

Between king and full mattresses, king-size mattresses are best suited for couples with pets or children. Full-size beds on the other hand make a perfect choice for solo sleepers as they are compact. 

Pick a measuring tape, make a note of the dimensions of your bedroom and place your order for the mattress of your choice. 

How We compare to Other Brands?

We offer a 365-day trial period and a warranty that lasts forever! If you don’t believe us go ahead and compare our offer to other brands. Apart from being one of the largest mattress sellers in the United States, we give you 9 reasons why nectar may be your best and the last mattress you purchase.

Sleep Trial Warranty Free Shipping * Free Return 2 Free Pillows Free Sheets Free Mattress Protector Price (Queen) Total Price
DreamCloud Hybrid Mattress 365 Nights Forever Warranty™ check check check check check $999 $999 Shop Mattress
Casper Wave Hybrid 100 Nights 10 Years check check $178 $139 $95 $1,095 *$1,507+
Purple Hybrid 100 Nights 10 Years check check $196 check $99 $1,149 *$1,444+
Shop Mattress *Price reflects the subtotal of mattress protector, sheets and two pillows (Single pillow for twin/twinxl) compared to the current promotion on Nectar. Additional shipping fees may apply in AK and HI. Price may not reflect any current promotions or discounts. Last Updated: Mar 2021.


Which is the popular mattress?

A full-size mattress and queen size mattress are preferred by many people. T Though they may be inches narrower than king-size beds, both these sizes offer a comfortable sleeping experience for couples as well as single sleepers. 

How much bigger is a king than a full?

Full-size beds are narrower than the king size mattresses by 22 inches. They are also shorter than king size mattresses by 5 inches.  

Can a king-size bed accommodate 2 people?

 A standard king sized mattress is 76 inches in breadth and 80 inches in length. Two people can sleep comfortably on a king-size bed. However, various factors such as the sleeping habits of the couples, the size of the room, and the budget must be considered beforehand. 

What is the difference between a bed and a mattress?

As far as the dimensions are concerned, there are slight changes. A bed can often be referred to as a mattress. A mattress refers to the sleeping pad used to lie down on a bed. However, when talking about a bed it can include other parts like the bed frame and the headboard.