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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.

Your guide to understanding Endometriosis & being diagnosed

This guide is designed to help you understand endometriosis and enable you to collect the correct health data so you can positively work with your provider for a diagnosis.

By Gemma Rigby

Updated September 29, 2025

Your guide to understanding Endometriosis & being diagnosed

This guide is designed to help you better consult with clinicians and professionals, especially when seeking support and advice about Endometriosis. 

Download Endo Guide now

The guide includes information about: 

  • What endometriosis is and the common symptoms.
  • How to collect data about your health to inform a diagnosis. 
  • How to speak to your doctor and advocate for your hormone health. 

  Download FREE guide

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