The flag of Belarus has a horizontal design with two main stripes and an ornamental pattern on the left side. The aspect ratio is 1:2.

Top stripe: Red (#C8313E), occupying two-thirds (66.67%) of the flag's height. Bottom stripe: Green (#4AA657), occupying one-third (33.33%) of the flag's height.

On the left side, there's a vertical white-red-white (1:1:2) decorative pattern called "Pahonia" or "Rushnik," which spans the entire height of the flag and covers one-ninth (11.11%) of its length.

Exact measurements depend on the specific flag size being produced.