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Armband Size Guide

Upper arm circumference

How to Measure

  1. 1Wrap a flexible tape measure around your upper arm
  2. 2Measure at the fullest part (mid-bicep)
  3. 3Note in inches or centimeters

Size chart

Size Inches cm
Standard Armband 8.5″ – 15.5″ 21.5 – 39 cm
Extra-Long Armband 12.5″ – 18.5″ 31.5 – 47 cm
Both armbands fit most body types.
Additional bra extenders can be purchased at any store if larger sizing is required.

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Can I chart with a copper IUD?

By Liza Blake

Updated February 09, 2025

Yes! You can chart your cycles with a copper IUD if you want. Some find charting with a copper IUD to be slightly more difficult than without it, but it is a very valid option.

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