IN to Bra Size Converter

Enter your underbust and bust in inches to convert them into precise band and cup sizes. Instant outputs for US, UK, EU, FR, IT, JP, and AU systems plus fit guidance.

Start converting in inches See inch measuring tips

Prefer centimeters? Use the CM converter instead

Why inches matter

Inch-first layout removes the need to toggle units every time you test a measurement.
Shows sister sizes and regional equivalents so you can shop US/UK brands without extra math.
Advanced mode lets you add multiple bust readings to refine your cup recommendations.

36C bust size in inches example

A 36C bust size in inches typically pairs a snug 36-inch underbust with a bust measurement near 39 inches, creating the three-inch difference that maps to a C cup.

Enter those values into the converter to confirm the 36C result, review sister size alternatives, and see how other regions label the same fit.

Jump to the detailed 36C bust size in inches guide

Convert in three easy steps

Measure a snug underbust

Wrap a tape around your ribcage directly under the bust. Keep it level and write down the snug measurement in inches.

Measure the fullest bust

Stand tall and note the fullest part of your bust in inches. Add leaning or lying measurements if you want extra precision.

Enter & convert

Type the numbers into the converter below with the unit left on inches, then review the bra size outputs.

Convert inches to bra sizes

Need centimeters? Flip the unit switch above the inputs any time.

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 (in)

Bust Size (in)

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.

Check sister sizes once you have your base size

Band conversion cheat sheet

Use this quick table to map inch underbust numbers to 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

Measure with confidence

Follow our step-by-step guide for consistent inch measurements, then compare how each size looks in the perception guide.

Read the measurement guide Browse size perception examples

IN to bra size FAQ

Can I switch to centimeters after converting?

Yes. Tap the unit tabs above the inputs to jump between inches and centimeters without losing your entries.

What if my measurements are between sizes?

Review the sister size suggestions shown after converting. Adjusting the band up or down while compensating in the cup preserves volume but changes tightness.

Do the results include international labels?

They do. You’ll see US, UK, EU, FR, IT, JP, and AU outputs so you can match tags regardless of where you shop.

What is a 36C bust size in inches?

A 36C bust size in inches usually comes from a snug 36-inch band and a bust measurement around 39 inches, giving the three-inch difference associated with a C cup.