Whether you wish to mount a small flag to the front of your house or are working with a community group to erect a large flag in a public park, you won't use the same length of flagpole. Flags are available in a long list of sizes, and the size of each flag dictates the appropriate length of its flagpole.
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Probable Pole Height
For small flags such as those you might mount at home, your pole should be on the shorter side. For example, a flag that measures 3 feet by 5 feet needs at least a 15-foot pole. A 20- to 25-foot pole is appropriate for a flag that is 4 feet by 6 feet. The pole size should continue to increase based on the flag size. A 50-foot pole works for a flag that measures 10 feet by 15 feet, while a 75- to 100-foot pole is necessary for a flag that is 15 feet by 25 feet.