Flag Calculator | USA
This Flag Calculator is a useful tool designed to help measure the appropriate size of a flag based on various factors for the United States flag.
This us flag size calculator takes into account important elements such as the height of the flagpole and the intended location of the flag (indoor or outdoor).
When you have a 30-foot flagpole outside your building. Using a USA Flag Calculator, you might input this information and receive a recommendation for a flag size of approximately 5 feet by 8 feet. This calculation ensures that the flag maintains proper proportions and visibility when flown.
Flag Size Chart
| Flagpole Height (ft) | Outdoor Flag Size (ft) | Indoor Flag Size (ft) |
|---|---|---|
| 20 | 3 x 5 | 3 x 5 |
| 25 | 4 x 6 | 3 x 5 |
| 30 | 5 x 8 | 4 x 6 |
| 35 | 6 x 10 | 4 x 6 |
| 40 | 6 x 10 | 5 x 8 |
| 50 | 8 x 12 | 5 x 8 |
| 60 | 10 x 15 | 6 x 10 |
| 70 | 12 x 18 | 6 x 10 |
| 80 | 12 x 18 | 8 x 12 |
| 100 | 20 x 30 | 8 x 12 |
Flag Size Formula
The Flag Size Formula is based on the principle that the flag’s fly length should be proportional to the flagpole height. A common formula used is:
Flag Fly Length = Flagpole Height ÷ 3For example, if you have a 60-foot flagpole:
Flag Fly Length = 60 ÷ 3 = 20 feetThe flag’s hoist (width) is then determined based on the standard proportions of the flag. For the U.S. flag, the proportion is typically 1:1.9, meaning the width is about 52.6% of the length.
Using our example:
Flag Hoist = 20 ÷ 1.9 ≈ 10.5 feetFor a 60-foot flagpole, the recommended flag size would be approximately 10 x 20 feet (rounded to standard sizes, this would be a 10 x 15 foot flag).
How to Calculate Flag Size?
To calculate the appropriate flag size, follow these steps:
Measure the flagpole height
Divide the height by 3 to get the recommended fly length
Divide the fly length by 1.9 to determine the hoist (width)
Round to the nearest standard size
Suppose you have a 45-foot flagpole:
Flagpole height = 45 feet
Fly length = 45 ÷ 3 = 15 feet
Hoist = 15 ÷ 1.9 ≈ 7.9 feet
Rounding to standard sizes, the recommended flag would be 8 x 12 feet.
What are 5 American Flag Rules?
Display from sunrise to sunset: The flag should be raised briskly at sunrise and lowered ceremoniously at sunset. For example, if sunrise is at 6:30 AM and sunset at 8:00 PM, the flag should be displayed during these hours.
Illumination for night display: If displayed at night, the flag must be properly illuminated. For instance, installing a dedicated flagpole light ensures visibility and respect during nighttime hours.
Weather conditions: The flag should not be displayed during inclement weather unless it’s an all-weather flag. For example, using a nylon flag instead of cotton allows for display even during light rain.
Position of honor: When displayed with other flags, the U.S. flag should be at the center and highest point. In a group of state flags, the U.S. flag should be at the center or to the observer’s left.
Half-staff protocol: The flag is flown at half-staff as a sign of mourning. For example, on Memorial Day, the flag is raised to full-staff, then lowered to half-staff until noon, when it’s raised again to full-staff.
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