What are measurements of queen size pillow case?

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)