The flag of Czechia has a rectangular shape with a ratio of 2:3. It consists of two horizontal bands of equal size, the upper one being white and the lower one red. The exact colors used are specified by the Czech standard CSN 01 0021 and are defined as follows:

• White: Pantone "White" or RGB (255, 255, 255)
• Red: Pantone 186C or RGB (213, 0, 0)

There are no geometric properties or measurements specified for the flag.