CM to Bra Size Converter

Input your underbust and bust in centimeters to see your band and cup size across US, UK, EU, FR, IT, JP, and AU systems. Metric-first workflow plus quick measuring tips.

Start converting in CM How to measure in centimeters

Prefer inches? Switch to the inch converter

Why this converter helps

Metric-first input keeps the calculator locked on centimeters—no manual toggles required.
Instantly shows your equivalent size across US, UK, EU, FR, IT, JP, and AU systems.
Advanced mode lets you add multiple bust positions for more precise cup guidance.

See the 36C bust size in inches breakdown for a real-world example

Three quick steps

Measure your snug underbust

Wrap the tape firmly under your bust in centimeters. Keep it level and record the snug number.

Measure the fullest bust

Stand naturally and note the fullest bust circumference in centimeters. For extra accuracy, grab leaning and lying measurements too.

Enter values & convert

Type the numbers into the converter below. Leave the unit set to CM, then review the international size outputs.

Convert centimeters to bra sizes

Need inches instead? Toggle the unit tabs above the inputs.

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.

Explore sister sizes once you have your base size.

Band conversion cheat sheet

Use the table below to cross-reference centimeter underbust measurements with international band labels.

Global Size Conversion

US/UK	EU	FR	IT	JP	AU/NZ	DE	PK	IE	ZA
28A	60A	75A	1A	65A	6A	60A	28A	28A	28A
28B	60B	75B	1B	65B	6B	60B	28B	28B	28B
28C	60C	75C	1C	65C	6C	60C	28C	28C	28C
28D	60D	75D	1D	65D	6D	60D	28D	28D	28D
28DD	60E	75E	1E	65E	6DD	60E	28DD	28DD	28DD
28E	60F	75F	1F	65F	6E	60F	28E	28E	28E
28F	60G	75G	1G	65G	6F	60G	28F	28F	28F
28G	60H	75H	1H	65H	6G	60H	28G	28G	28G
30A	65A	80A	2A	70A	8A	65A	30A	30A	30A
30B	65B	80B	2B	70B	8B	65B	30B	30B	30B

Lock in accurate measurements

Follow our step-by-step measuring guide for photos and pro tips, then compare how each size presents in the perception guide.

Read the measurement guide View size perception examples

CM to bra size FAQ

Do I need to convert to inches before using this tool?

No. The calculator defaults to centimeters and converts behind the scenes. Simply leave the unit toggle on CM and enter your numbers.

What if my band measurement lands between two sizes?

Check the sister size suggestions after you convert. Dropping one band size and increasing the cup (or vice versa) fine-tunes tightness while keeping cup volume similar.

Will the results work for EU or Asian bra sizes?

Yes. The output includes US, UK, EU, FR, IT, JP, and AU systems so you can match regional labels without extra math.