How do I convert my bra measurements into sizes?

Enter your snug underbust and bust measurements, choose CM or IN, and the converter will output your band and cup size along with international equivalents.

Can I see UK, EU, and other regional labels?

Yes. The converter highlights UK, EU, FR, JP, and AU sizes so you can compare tags before shopping abroad or online.

What if I need centimetre or inch specific tools?

Use the links to our dedicated CM and IN calculators for workflows tailored to each measurement system.

Bra Size Converter

Convert measurements into band and cup labels and compare international systems in one view.

Start converting Review the at-home measuring guide

Prefer a dedicated experience? Use the CM converter or switch to the IN converter

Convert your bra size in seconds

Choose centimetres or inches, add your snug underbust and bust numbers, then review the suggested band, cup, and sister sizes.

Bra Size Calculator

Advanced Mode (ABTF-style)

Use snug/tight underbust and standing/leaning/lying bust to get a recommended try-on range and style tips.

Enable

Measurement Unit:

Band Size (cm)

Bust Size (cm)

Measurement Guide

Band Size

Measure around your ribcage, just below your breasts. The tape should be snug but not tight.

Bust Size

Measure around the fullest part of your breasts, keeping the tape measure parallel to the floor.

Why this converter

Calculate band, cup, and sister sizes from two measurements.
See US, UK, EU, FR, JP, and AU labels without extra math.
Copy results or dive deeper into specialist converters in one click.

Related tools

US to UK conversion guide

Understand how double letters map between American and British cup systems.

International size guide

Browse comparison charts and fitting advice by region.

Sister size finder

Jump to nearby sizes to fine-tune band tension or cup depth.

Global conversion chart

Preview the cross-system table used by our calculator for quick reference.

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

Converter FAQs

How accurate is this bra size converter?

It relies on the same calculation engine as our main calculator and incorporates the latest international conversion data. Use it as a starting point and adjust with fit feedback.

Can I switch between centimetres and inches?

Yes. Toggle the unit inside the calculator; results update instantly and the quick links lead to CM or IN focused workflows.

Will it show sister sizes automatically?

Yes. The results include recommended sister sizes plus deep links to our sister size guide for more context.