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Armband Size Guide

Upper arm circumference

How to Measure

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.

What is an OPK or LH test strip?

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Updated February 09, 2025

An ovulation predictor kit (OPK) measures luteinizing hormone (LH) present in your urine.

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