One page, every system: use this as a quick reference once you already know your measurements.
Accurate, private, and always free- no signup, and nothing you enter is stored.
How to Read These Charts
Find your band number in the left column of the relevant system, then match your cup letter across the top. If you haven’t measured yet, start with the Main Bra Calculator instead: it does this lookup for you automatically.
Looking for a Specific Size?
We’ve written individual guides for the most-searched specific sizes34C, 38D, and more: each covering common fit notes and sister sizes for that exact size.
Understanding Band vs. Cup
The band number describes ribcage circumference; the cup letter describes the difference between bust and underbust. Neither number means anything about body size or shape on its own. They only describe the bra, not the person.
How to Read a Size Chart Correctly
Always find your band size first, then locate your cup within that band row. Reading cup letter first and guessing the band is the most common size-chart mistake, since cup letters mean different things at different bands.
A Quick Cross-System Reference
| US | UK | EU | Band (cm) |
|---|---|---|---|
| 32B | 32B | 32B | 70cm |
| 34C | 34C | 34C | 75cm |
| 36D | 36D | 36D | 80cm |
| 38DD | 38DD | 38E | 85cm |
Use the Global Bra Size Converter for your exact size in all 7 systems rather than interpolating from this shortened reference.
Every Specific Size, In Depth
Beyond the quick reference above, every common size from 30AA through 38F has its own dedicated guide covering sister sizes, international equivalents, and common fit notes for that exact combination.
What’s Actually on This Site
This isn’t one static chart. It’s a full reference system: individual size guides for specific band-and-cup combinations, standalone cup-letter explainers, sister-size and same-band cup comparisons, and international conversion tables, all built from the same underlying measurement logic so the numbers stay consistent across every page.
How to Find What You Need
If you know your exact size, jump straight to its Specific size guide. If you’re comparing two sizes to figure out which fits better, the comparison pages (linked throughout this section) walk through the actual difference. If you’re starting from scratch, the Main Bra Calculator gives you your real size first.
Why the Numbers Are Consistent Everywhere
Every chart, guide, and comparison on this site uses the same band-and-cup methodology. See Our fitting process for the exact math: so a size guide, a sister-size comparison, and the main calculator will never contradict each other. That consistency is deliberate, not incidental.
How to Read This Chart Correctly
Find your measured band size in the left column, then find your cup letter across the top. The intersection is your size. If your exact band number isn’t listed, round to the nearest even number using the same modern-method logic the calculator uses, rather than rounding to whichever number is more common.
What the Chart Can’t Tell You
A size chart shows you the label, not the fit. Actual comfort still depends on brand cut, fabric, and construction, all of which vary even at the exact same charted size. Use the chart to narrow down a starting point, then trust fit feedback (gaping, spillage, band comfort) over the number itself.
Why Charts Vary Slightly Between Sources
Different bra-fit resources sometimes use slightly different band or cup ladder conventions (for example, whether E and DD are treated as the same size or different ones), which is why two charts can show a small mismatch even when both are internally consistent. This site’s charts are built from the same underlying formula used across every calculator here, so results stay consistent site-wide even if they differ slightly from another source’s convention.
Bookmarking This Page for Repeat Reference
Since sizing conventions vary by system and can be easy to forget, this chart is designed to be a quick repeat reference rather than a one-time read.