1) Standard Pillow Size
The standard pillow size measures 20″x26″. You can place one standard pillow on a twin bed, two across a full or queen-sized bed, and three across a king-sized mattress.
2) Queen Pillow Size
A queen pillow measures 20”x30”. Two queen pillows fit nicely across a queen bed. Both the standard and queen pillows use a standard pillow case.
3) King Pillow Size
A king pillow measures 20”x36”. A pair of king pillows fit perfectly across a king bed, and they use a king pillow case.
4) Euro Pillow Size
A Euro pillow measures 26”x26”. Euro pillows are popular internationally as bedding pillows, and many hotels offer them on their beds, along with standard sized pillows. At 26”x26”, euro pillows are large, square pillows that were made to provide support for leaning against the headboard of a bed.