Bed dimensions in feet averages are: queen size is 5′ x 6.83′ (60″ x 82″) = 33.4 square feet, king 6.3′ x 6.83 (75.6″x82″) = 42.2 sqft, twin 3.17′ x 6.25 (38″ x 75″) = 19.6 sqft, and full 4.5′ x 6.25′ (54″ x 75″) = 28.1 sqft
It is important to know this information when shopping for a new mattress as there are sometimes odd sizes being sold. This can be due to manufacturers working in metric and imperial units as manufacturing takes place in countries all around the world.
And I have found even just a 0.5″ difference in measurements can make some OCD customers INSANELY UPSET! I guess they must have a pretty good life if that is what they have to complain about.
TIP: Make sure to measure your bed frame before purchasing a new model to make sure it will fit. The below are measurements MOST often found in stores and online.
For 9 sizes and models bigger than a king please see my information here, 4 giant and world’s largest here, if yours is too big for your mattress fix it easy with these tips, and check average bedroom sizes to help match your bed size here.
Scott Boyd
Table 1. Twin size 0.67′ (8”) dimensions
| Size | Width | Length | Height | Sqft | Cuft |
| Twin | 3.17′ | 6.25′ | .67′ | 19.8 | 13.3 |
Table 2. With 0.83′ (10”) dimensions
| Size | Width | Length | Height | Sqft | Cuft |
| Twin | 3.17′ | 6.25′ | .83′ | 19.8 | 16.4 |
Table 3. With 1′ (12”) dimensions
| Size | Width | Length | Height | Sqft | Cuft |
| Twin | 3.17′ | 6.25′ | 1′ | 19.8 | 19.8 |
Full
Full-size beds are 4.5′ wide by 6.25′ long for 28.1 square feet and the Double is the same, just a different term. Full XL is 4.5′ wide by 6.67′ long for 30 square feet. The three-quarter and antique are 4′ wide by 6′ long for 24 square feet.
Table 1. Full-size with 0.67” (8”)
| Full Size | Width | Length | Height | Square | Cubic |
| Full | 4.5′ | 6.25′ | .67′ | 28.1 | 18.8 |
| Double | 4.5′ | 6.25′ | .67′ | 28.1 | 18.8 |
| Full XL | 4.5′ | 6.67′ | .67′ | 30.0 | 20.1 |
| Antique | 4′ | 6′ | .67′ | 24.0 | 16.0 |
| Three-quarter | 4′ | 6′ | .67′ | 24.0 | 16.0 |
Table 2. With 0.83′ (10”)
| Full Size | Width | Length | Height | Square | Cubic |
| Full | 4.5′ | 6.25′ | .83′ | 28.1 | 23.3 |
| Double | 4.5′ | 6.25′ | .83′ | 28.1 | 23.3 |
| Full XL | 4.5′ | 6.67′ | .83′ | 30.0 | 24.9 |
| Antique | 4′ | 6′ | .83′ | 24.0 | 19.9 |
| Three-quarter | 4′ | 6′ | .83′ | 24.0 | 19.9 |
Table 3. With 1′ (12”)
| Full Size | Width | Length | Height | Square | Cubic |
| Full | 4.5′ | 6.25′ | 1′ | 28.1 | 28.1 |
| Double | 4.5′ | 6.25′ | 1′ | 28.1 | 28.1 |
| Full XL | 4.5′ | 6.67′ | 1′ | 30.0 | 30.0 |
| Antique | 4′ | 6′ | 1′ | 24.0 | 24.0 |
| Three-quarter | 4′ | 6′ | 1′ | 24.0 | 24.0 |
Queen
Queen-size beds in the US for the Standard is 5′ wide x 6.83′ long for 33.4 square feet, Olympic at 5.5′ x 6.83′ for 36.7 square feet, California at 5′ x 7′ for 23.5 square feet, and Split at 5′ x 6.83′ for 22.4 square feet.
Table 1. Queen-size bed 0.67′ (8”) thick mattress
| Queen Size | Width | Length | Height | Sqft | Cuft |
| Queen | 5′ | 6.83′ | .67′ | 33.4 | 22.4 |
| Olympic | 5.5′ | 6.83′ | .67′ | 36.7 | 24.6 |
| California | 5′ | 7′ | .67′ | 35.0 | 23.5 |
| Split | 5′ | 6.83′ | .67′ | 33.4 | 22.4 |
Table 2. Queen-size bed 0.83′ (10”)
| Queen Size | Width | Length | Height | Sqft | Cuft |
| Queen | 5′ | 6.83′ | .83′ | 33.4 | 27.7 |
| Olympic | 5.5′ | 6.83′ | .83′ | 36.7 | 30.5 |
| California | 5′ | 7′ | .83′ | 35.0 | 29.1 |
| Split | 5′ | 6.83′ | .83′ | 33.4 | 27.7 |
Table 3. Queen-size bed 1′ (12”)
| Queen Size | Width | Length | Height | Sqft | Cuft |
| Queen | 5′ | 6.83′ | 1′ | 33.4 | 33.4 |
| Olympic | 5.5′ | 6.83′ | 1′ | 36.7 | 36.7 |
| California | 5′ | 7′ | 1′ | 35.0 | 35.0 |
| Split | 5′ | 6.83′ | 1′ | 33.4 | 33.4 |
King
Standard king-size beds are 6′ 4” wide by 6′ 8” long with the most common platform 1′ high off the floor and a 1′ high mattress. Combined with a platform foundation and mattress is 84.4 cubic feet. With a box spring frame and 1′ mattress, it is 126 cubic feet.
The below last two columns in the tables below are in square and cubic feet. I am trying to save space for mobile viewers.
Table 1. King size 0.67′ (8”)
| King Size | Width | Length | Height | Sqft | Cuft |
| King | 6.3′ | 6.83′ | .67′ | 42.2 | 28.3 |
| Eastern | 6.3′ | 6.83′ | .67′ | 42.2 | 28.3 |
| California | 6′ | 7′ | .67′ | 42 | 28.1 |
| Western | 6′ | 7′ | .67′ | 42 | 28.1 |
| Alaska | 9′ | 9′ | .67′ | 81 | 54.3 |
| Wyoming | 7′ | 7′ | .67 | 49 | 32.8 |
| Alberta | 8′ | 8′ | .67 | 64 | 42.9 |
Table 2. With 0.83′ (10”)
| King Size | Width | Length | Height | Sqft | Cuft |
| King | 6.3′ | 6.83′ | .83′ | 42.2 | 35.2 |
| Eastern | 6.3′ | 6.83′ | .83′ | 42.2 | 35.2 |
| California | 6′ | 7′ | .83′ | 42 | 34.9 |
| Western | 6′ | 7′ | .83′ | 42 | 34.9 |
| Alaska | 9′ | 9′ | .83′ | 81 | 67.2 |
| Wyoming | 7′ | 7′ | .83 | 49 | 40.7 |
| Alberta | 8′ | 8′ | .83 | 64 | 53.1 |
Table 3. With 1′ (12”)
| King Size | Width | Length | Height | Sqft | Cuft |
| King | 6.3′ | 6.83′ | 1′ | 42.2 | 42.2 |
| Eastern | 6.3′ | 6.83′ | 1′ | 42.2 | 42.2 |
| California | 6′ | 7′ | 1′ | 42. | 42 |
| Western | 6′ | 7′ | 1′ | 42 | 42 |
| Alaska | 9′ | 9′ | 1′ | 81 | 81 |
| Wyoming | 7′ | 7′ | 1′ | 49 | 49 |
| Alaska | 8′ | 8′ | 1′ | 64 | 64 |
If there are other variations that you think should be included please contact me to let me know and I will add the information.
Sources:
Forbes: Key Measurements for Your Dream Bedroom
SF Gate: Standard Bed Sizes in the United States
