A king size pillw case measures 20 inches by forty inches.
The size of a standard pillow is 20" X 26". The size of a king size pillow is 20" X 28.
20X26 It is called a standard pillow case
Generally, twin size pillow cases are 22" x 33".
20" x 36" x 2"
king size
Pillow cases areFINISHED SIZE: Standard Case: 21" x 32"; Queen: 21" x 36";King Case: 21" x 42"This info was found at http://www.craftandfabriclinks.com/pillowcases/cases.html
The standard size of a pillow case is 21"x30".
The average size of a king size pillow is 20" x 36"
There is no such thing as queen sized pillow cases, all pillows are usually the same size unless you have one of those long pillows that go across the bed. But if you are buying a pillow case, there are no sizes.
The pillow
You can get a king sized pillow sham if you have a king sized bed. Or if you have big pillows.