What if my measurements fall between two band sizes?

Review the suggested sister sizes after converting. Adjusting the band up or down while compensating with the cup keeps volume similar but changes tightness.

Do the results include international sizing systems?

They do. The output covers US, UK, EU, FR, IT, JP, and AU labels so you can match tags globally.

IN to Bra Size Converter

Q: Can I switch to centimeters after converting?

Yes. Use the unit toggle above the inputs to flip between inches and centimeters at any time without losing your values.

Q: What is a 36C bust size in inches?

A 36C bust size in inches usually comes from a 36-inch snug underbust and a bust measurement close to 39 inches, creating the three-inch difference that maps to a C cup.

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	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

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.