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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.

Can I chart while on hormonal birth control?

By Liza Blake

You can chart your symptoms while on hormonal birth control, but most hormonal birth control suppresses ovulation, so you won’t have “complete” charts, and they may be confusing to understand. Charting while on hormonal birth control can help you develop the habits to record your temperature and cervical mucus if you plan to come off of it to chart your cycles.