Something like 9 inches x 18 inches...
The size of a standard pillow is 20" X 26". The size of a king size pillow is 20" X 28.
Generally, twin size pillow cases are 22" x 33".
20X26 It is called a standard pillow case
20" x 36" x 2"
standard pillowcases are 21x32 while king size are 21x42
A king size pillw case measures 20 inches by forty inches.
Queen Pillow: 20" x 30"
Throw pillows aren't all one standard size. They come in different sizes.
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.
1 and 2/3 ft. by 2 ft. 50 cm x 60 cm
What is the biggest size, that a pillow pet you can get
Just in Case airline travel pillow covers: http://www.jacksmom.com/