The flag of Guatemala has an aspect ratio of 5:8. It consists of three vertical stripes with the following color codes and proportions:

1. Blue stripe (RGB: 0, 32, 159; Hex: #00209F) - occupies 1/4 of the flag's width.
2. White stripe (RGB: 255, 255, 255; Hex: #FFFFFF) - occupies 1/2 of the flag's width.
3. Blue stripe (RGB: 0, 32, 159; Hex: #00209F) - occupies 1/4 of the flag's width.

In the center of the white stripe, there is the Guatemalan coat of arms. The coat of arms has a diameter equal to half the width of the white stripe.