Select both a band and a cup size to continue.
That's roughly the volume of a standard drinking glass.
Turning a size into a number you can picture
Band and cup labels are convenient shorthand, but they don't tell you much about scale on their own. This tool takes the same cup-index logic used elsewhere on this site and reports it as a fillable capacity — the kind of number you'd use to compare a measuring jug, not just a letter.
As with any size-to-volume conversion, treat this as a rough, comparison-only estimate. Cup shape, projection and how a brand cuts its pattern all affect how a given capacity actually feels in a bra.
Reading the number
What a capacity estimate is good for
Seeing the jump between sizes
Watching the capacity number change between a C and a D can make the size difference feel more concrete than the letters alone.
Same letter, different capacity
If a brand's cups run small or large, a capacity comparison helps explain roughly why.
Insert or padding sizing
Always confirm inserts or padding fit in the actual cup — pattern shape varies more than raw capacity.
Medical or surgical use
This is a shopping-comparison estimate only, not a clinical measurement.
Questions
Cup volume FAQs
Same underlying idea, reported differently — this tool gives a fillable capacity in ml and fl oz with everyday comparisons, rather than a cc range for shopping comparisons.
The same cup letter is cut larger on a bigger band, so it holds more volume even though the letter looks identical.
It gives a rough sense of scale, but always confirm fit by trying inserts in the actual cup, since shapes vary between brands.
No. This is a shopping-comparison estimate only, not a clinical or surgical measurement.
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