Boat Flag Sizes
An Official Guide to
| Powerboat Length | Flag Size | Sailboat Length | Flag Size | |||
| up to 18' | 10x15" flag | up to 30' | 10x15" flag | |||
| 19' to 24' | 10x15" flag | 31' to 36' | 12x18" flag | |||
| 25' to 30' | 12x18" flag | 37' to 48' | 16x24" flag | |||
| 31' to 36' | 16x24" flag | 49' to 60' | 20x30" flag | |||
| 37' to 48' | 20x30" flag | 61' to 72' | 24x36" flag | |||
| 49' to 60' | 24x36" flag | |||||
| 61' to 72' | 30x48" flag |
U.S. Ensign
| Powerboat or Sailboat Length |
Flag Size | |
| up to 18' | 12x18" flag | |
| 19' to 24' | 16x24" flag | |
| 25' to 30' | 20x30" flag | |
| 31' to 36' | 24x36" flag | |
| 37' to 48' | 30x48" flag | |
| 49' to 60' | 3x5 ft flag | |
| 61' to 72' | 4x6 ft flag |
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