20X26 It is called a standard pillow case
standard pillowcases are 21x32 while king size are 21x42
The standard size of a pillow case is 21"x30".
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".
A king size pillw case measures 20 inches by forty inches.
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
Throw pillows aren't all one standard size. They come in different sizes.
1 and 2/3 ft. by 2 ft. 50 cm x 60 cm
1 and 2/3 ft. by 2 ft. 50 cm x 60 cm
Queen Pillow: 20" x 30"
The pillows are these dimensions: Standard (20 x 26 inches), Queen (20 x 30 inches), and King (20 x 36 inches) and, the pillow cases are these dimensions. Standard: 20 × 26 in (51 × 66 cm) Queen: 20 × 30 in (51 × 76 cm) King: 20 × 36 in (51 × 91 cm)