Flag Size Guide
For home wall-mounted flagpoles
5' poles
2' x 3', 2-½' x 4', 3' x 5'
6' poles
3' x 5'
For in-ground flagpoles
The rule of thumb is that the fly of the flag (the length or long dimension) should be 1/3 to ¼ the height of the flagpole. For example, if you have a 20' flagpole, ¼ of that is 5, so the fly of the flag should be 5'. This means that you need a 3' x 5' flag!
For Powerboat Flags*
Up to 30'
Use a 12" x 18" Flag
31' to 36'
Use a 16" x 24" Flag
37' to 48'
Use a 20" x 30" Flag
49' to 60'
Use a 24" x 36" Flag
61' to 72'
Use a 30" x 48" Flag
For Sailboat Length*
Up to 30'
Use a 10" x 15" Flag
31' to 36'
Use a 12" x 18" Flag
37' to 48'
Use a 16" x 24" Flag
49' to 60'
Use a 20" x 30" Flag
61' to 72'
Use a 24" x 36" Flag
US Ensign**
Up to 18'
Use a 12" x 18" Flag
19' to 24'
Use a 16" x 24" Flag
25' to 30'
Use a 20" x 30" Flag
31' to 36'
Use a 24" x 36" Flag
37' to 48'
Use a 30" x 48"
49' to 60'
Use a 3' x 5' Flag
61' to 72'
Use a 4' x 6' Flag
*Flagstuff may not carry all flag sizes
**For Powerboat and Sailboat