What is the size of the blue part of the us flag compared to its full size?

The blue part of the U.S. flag, known as the union, occupies the top left corner and measures 2:5 in width and height compared to the overall flag's dimensions. Specifically, the union is 40% of the flag's height and spans the width of 2:5 of the flag's total length. This means the blue field covers about 1/6th of the total area of the flag.