The flag of Tunisia is a red field with a centered white circle. The diameter of the circle is equal to two-thirds of the flag height. In the center of the circle is a red five-pointed star outlined in white.

The aspect ratio of the flag is 2:3. The colors used in the flag are Pantone 186C for the red, and Pantone White for the white. The geometric properties of the flag include a red rectangle as the field, a white circle in the center of the flag, and a red star within the circle.

The flag has a width-to-length ratio of 1:1.5, with the total dimensions being approximately 1.5 meters wide by 1 meter tall.