International bra size guide

Q: What measurements should I keep on hand?

Keep your snug underbust plus at least one bust measurement. For fuller busts, add leaning and lying measurements to check which cup depth feels best across brands.

Translate your measurements across US, UK, EU, FR, IT, JP, and AU size systems so you can shop anywhere with confidence.

Jump to the conversion chart Read the in-depth conversion guide

Tip: have both snug underbust and standing bust measurements ready for the most accurate conversion.

What you can do here

Compare every major international band and cup label in one glance.
Learn the three-step workflow pros use to translate sizes without losing cup volume.
Find direct links to inch and centimeter calculators plus sister size support.

Global band & cup conversion

Use this chart to see how a size like 36C converts into UK, EU, FR, IT, JP, and AU labels. Start with your most comfortable size, then trace across the row.

Global Size Conversion

US/UK	UK	EU	FR	IT	JP	AU/NZ	DE
28AA	28AA	70AA	85AA	3AA	70AA	6AA	70AA
28A	28A	70A	85A	3A	70A	6A	70A
28B	28B	70B	85B	3B	70B	6B	70B
28C	28C	70C	85C	3C	70C	6C	70C
28D	28D	70D	85D	3D	70D	6D	70D
28DD	28DD	70E	85E	3E	70E	6DD	70E
28DDD	28E	70F	85F	3F	70F	6E	70F
28G	28F	70G	85G	3G	70G	6F	70G
28H	28FF	70H	85H	3H	70H	6FF	70H
28I	28G	70I	85I	3I	70I	6G	70I

International cups advance at different rates (single letters vs. double letters), so always confirm the fit with a try-on or sister-size check.

Convert your size in three steps

Measure accurately

Record a snug underbust and a standing bust measurement. Add leaning or lying bust numbers if your shape changes between positions.

Match the base size

Locate your current size in the chart (or enter it into the calculator) and follow the row to the target country column.

Verify with sister sizes

If the converted band feels off, slide to the sister size above or below while adjusting the cup in the opposite direction.

Lock in your global fit

Run your numbers through the calculator, then compare silhouettes in the perception guide so each international size still feels like you.

Open the bra size calculator See how sizes look

Helpful tools

CM converter

Enter metric measurements and get instant international outputs.

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IN converter

Work in inches but still export results across every major sizing system.

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US to UK conversion guide

Swap cup letters between American and British sizing with worked examples.

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Sister size navigator

Adjust band tightness without losing cup volume when shopping different regions.

Launch tool

International sizing FAQ

Why do bra sizes change between countries?

Band labels are based on either inches or centimeters, and cup letters escalate differently by market (single vs. double letters). That’s why a 34D in the US maps to 75D in the EU and 90D in France.

How do I convert if I’m between band sizes?

Start with the closest band shown in the chart, then test the sister size above or below. For example, if 34 feels tight, convert the 36 band and drop the cup one letter to keep the same volume.

What measurements should I keep on hand?

Keep your snug (or tight) underbust plus at least one bust measurement (standing). For fuller busts, add leaning and lying measurements to check which cup depth feels best across brands.