Size
Full
54 × 75 in
Commonly listed at 54 by 75 inches. It is sixteen inches wider than a twin and exactly the same length, so a taller sleeper gains nothing by moving up to one. The name is the weak point: the same mattress is sold as full and as double, sometimes within one storefront.
Depths stated for Full in this catalog
1 of the 3 items in the catalog cut for Full state a depth on their listing. The figures below are what the sellers wrote, not what was measured here, and they are grouped by what part of the stack each item grips.
| Item | Layer | What the listing states | Deepest figure given |
|---|---|---|---|
| Quilted Waterproof Protector, Full | Mattress Protectors | 14 in | 14 in |
What Full gets confused with
Double
Full and double are the same bed under two names. Listings mix them freely, and a set labeled double should still state 54 by 75 inches somewhere. If it does not, the dimensions are the thing to go looking for.
Queen
A queen is six inches wider and five inches longer. It is close enough that the two look similar in a photograph and far enough that neither set of sheets works on the other bed.
Full XL
Full XL exists at 54 by 80 inches and is rare enough that most households will never meet one. If you have one, almost nothing sold as full will fit it lengthwise.
Everything here cut for Full
- Quilted Waterproof Protector, Fullin Mattress Protectors
- Lucid 3 Inch Memory Foam Topper, Fullin Mattress Toppers
- OLIXIS 2 Inch Gel Memory Foam Topper, Fullin Mattress Toppers
To add your own layers up and see what pocket depth the result needs, use Pocket Check. To see the other four sizes side by side, go to Sizes.
Where this comes from
What is federally regulated about a mattress is how it behaves in a fire, not how big it is. These are the rules that do exist.