US Mattress Sizes with their Width x Length in inchesTwin (also called Single) 39x75" Twin Extra Long 39x80"
Full (also called Double) 54x75" Full XL 54x80"
King 76x80" California King 72x84"
Dual King 78x80" Dual California King 74x84"
How to Select the right size flat sheet for YOUR mattress:
In order to purchase the perfect sheet for your bed, it is important to know the depth of your mattress. This number varies widely (from 7" to 25".) Take a ruler and measure from the top of the mattress to the bottom (include the pillow top or any mattress topper that you may have.) Do not include your box springs.If you are trying to find a flat sheet that is WIDE enough to TUCK IN ON BOTH SIDES, you will need to do a bit of math. (this is a huge pet peeve of mine!! I CANNOT stand to make a bed when I can't tuck in the sheets :0 )
An example:You find a queen flat sheet that you Love and it measures 90x102".
This means that the width of the sheet is 102" and looking at the chart above, you see that the width of a queen size mattress is 80".
Take the width of the SHEET: 102" Subtract the width of the MATTRESS: 80"
102-80 = 22
Take the result and divide it by 2.
22 / 2 = 11
The result gives you the DROP. The drop is the amount of sheet that will hang over the mattress on each side.
In our example above, the mattress will have 11" of sheet extending over the edges.
If your mattress is 17" deep, you will not be able to tuck the sheet in on both sides. (17 - 11 = 6 ... so 6" on each side will not be covered.)
If you have a deep mattress, you will need to shop for Extra Deep bedding pieces. Charter Club, Hotel Collection, Charisma and Waterford are three of the brands that I sell that cater to deep mattresses.