Measured around the fullest part of your chest, tape level and snug.
Add this for an exact band and cup instead of just a category.
Enter your bust measurement to continue.
Why bust alone only gets you partway
A bra size is really two numbers working together: the band, which comes from your underbust, and the cup, which is the gap between underbust and bust. Bust on its own tells you roughly how full your chest is, but not how that fullness is distributed across a band.
Think of this tool as a quick first read — useful for browsing general size ranges, buying a gift, or sense-checking another size — while the full bra size calculator gives you an exact band and cup.
Reading your category
What each bust category means
Under 33″
Often pairs with smaller bands and A–B cups, though this varies by frame.
33″–37″
The most common range, typically landing in B–D cups depending on band.
38″–42″
Usually C–DD or higher, depending on how it pairs with your underbust.
43″ and above
Often benefits from wider straps and full-coverage cups for support.
Questions
Bust measurement FAQs
Not on its own. Bust alone gives a size category and a rough starting point — add an underbust measurement for an exact band and cup.
Around the fullest part of your chest, usually across the nipple line, wearing a well-fitting unpadded bra, with the tape level and snug but not tight.
Because a bust number alone doesn't reveal your band size — add underbust here, or use the full bra size calculator, for an exact result.
Yes, for many people it fluctuates with the menstrual cycle, weight changes, and hydration. Measuring at a consistent time gives more repeatable results.
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