Enter both measurements to continue.
A schematic fit diagram, scaled to your cup size.
Why this is a range, not a number
We estimate a rough per-step volume increase for each cup letter, scaled by band size, since the same letter represents more tissue on a larger band than a smaller one. The result is deliberately shown as a range rather than a precise figure.
Treat this purely as a comparison tool — useful for sensing how much more volume a sister size or a size up might represent, not as any kind of clinical measurement.
Using the estimate
What volume estimates are good for
Same volume, different band
Sister sizes should return very similar volume estimates — a useful sanity check that the relationship holds.
Same letter, different actual fit
If two brands' same-letter cups feel different, a volume estimate can help explain roughly how much the actual capacity differs.
Medical or surgical use
This estimate is a shopping comparison only — not a substitute for any clinical measurement or consultation.
Precise cross-brand prediction
Cup shape and cut vary enough between brands that this estimate won't predict an exact fit, only a rough comparison.
Questions
Volume estimate FAQs
It's a rough approximation only. Shape, density and how tissue is distributed all affect real volume in ways that band and cup size alone can't capture precisely.
Because volume scales with band size — the same cup letter represents more estimated volume on a larger band than on a smaller one.
Mainly comparison — getting a rough sense of how much more volume one size holds versus another, such as when deciding between a sister size or a brand that runs differently.
No. This is a shopping-comparison estimate only, not a clinical or surgical measurement. Speak with a doctor for anything medical.
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