The national flag of the Republic of Bulgaria is rectangular in shape and consists of three colors: white, green and red, placed horizontally from the top downwards. The coloured pieces are the same in shape and dimensions:
Shape: rectangular, the width-length ratio being 3:5.
When hoisted vertically, the flag’s maximum length can reach five widths.
Dimensions: 18 sm x 30 sm, 24 sm x 40 sm, 90 sm x 150 sm, 129 sm x 215 sm.
Colours: white – the degree of whiteness greater than 80%, green - Number 17-5936 of the Pantone-textile scale and red – number 18-1664 of the Pantone-textile scale.
the standards of the colours of the national flags are kept at the Standardization and Meteorology Committee.

(Extract from the State Seal and National Flag Law)

Note: The representation of the flag in close colours in the 16-colour code: white #ffffff; green -#00966E; red - #D62612.