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36A. 38A. There’s only a slight difference between single, double, and triple-A cup sizes. If the difference is less than half an inch, the right fit may be an AAA cup. The AAA is the modest cup size and the most uncommon.
Bra sizes have two components: a band size, which is a number, and a cup size, which is a letter. The band size is the measurement around your underbust in inches. The difference between your bust measurement and your underbust determines the cup size.
These simple at-home instructions for measuring your bra size will ensure a perfect fit for band and cup alike. Wearing the wrong bra size can ruin an otherwise flawless outfit (and lead to pain and backaches).
ThirdLove offers over 60 bra sizes from 32 to 44 band and bra cup sizes from AA to H cup, including our exclusive half cup sizes. Using your current bra size as a starting point, you can refer to the bra cup size chart below to refine your fit.
Clothing and bra experts are here to help you measure your bra size at home, even if you don't have a measuring tape. See our band and cup measurement chart.
Determine Your Bra Cup Size. Hit CALCULATE to find out your bra size in our bra calculator. Then be sure to browse the best bra styles and brands for your bra size. Or, subtract your band size from your bust size. The difference correlates to your cup size.
Cup Size Chart: Let's see how to determine your Cup Size. Use both Over bust measurement and Determined Band Size (determined above) to find your Cup Size. Calculate the difference between your Bust Measurement and Band Size like this: Cup Size = Over bust measurement (inches)- Band Size (determined above)