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How to Measure Your Flagpole Diameter

Measuring a Flagpole Diameter is hard!

Don't know your flagpole size? No problem! Just measure around the bottom with string or a tape measure.

Easy Flagpole Diameter Calculator

Enter the circumference you measured (in inches):

Diameter: — inches

Step-by-Step Instructions

  1. Wrap a string or tape measure tightly around the bottom of your flagpole (the thickest part).
  2. Mark where it overlaps and measure that length = your circumference.
  3. Enter the number above to get the diameter.

Formula used: Diameter = Circumference ÷ 3.1416

Need Help Choosing a Retainer Ring?

Once you have your diameter, check our Beaded Retainer Rings page. Still unsure? Send us your circumference measurement and we’ll recommend the right size.