Bra Size Calculator

Find your perfect fit with our professional sizing guide

Before You Start: Fitting Tips
✅

Perfect Fit Signs

  • Band sits level
  • No spillage
  • Comfortable straps
  • Center gore lies flat
⚠️

Poor Fit Signs

  • Band rides up
  • Cups gap or overflow
  • Straps dig in
  • Underwire pokes
💡

Pro Tips

  • Try sister sizes
  • Remeasure regularly
  • Brand fits vary
  • Professional fitting helps
STEP 1 Band Size Measurement

📏 How to Measure Your Band Size

Band measurement

Instructions:

  • Wear a non-padded bra
  • Measure around your ribcage
  • Keep tape level and snug
  • Round to nearest inch (33.5 to 34)
  • Round to even number (33 to 32 or 34)

Tips:

  • Measure just under your bust
  • Breathe normally while measuring
  • Ask someone to help if possible
  • Take measurement 2 times
💡 Why this matters: Your band provides 80% of your bra's support. An accurate measurement is crucial for comfort and fit.
in
STEP 2 Cup Size Measurement

📐 How to Measure Your Cup Size

Cup measurement

Instructions:

  • Measure around fullest part of bust
  • Keep tape parallel to floor
  • Do not pull tape too tight
  • Round to nearest whole inch

Tips:

  • Stand up straight
  • Look in mirror for accuracy
  • Measure over your bra
  • Take measurement 2 times
💡 Why this matters: This measurement determines your cup size. Measure at the fullest part of your bust for the most accurate fit.
in

Your Recommended Bra Size

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Great job! ⭐⭐⭐⭐⭐ This is your starting point — try on bras in this size and sister sizes for the best fit! Fit varies between brands and styles.
Band Size
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Cup Size
-
Difference
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Sister Sizes to Try:

💡 When you go up a band size (e.g., 36 to 38), maintain the same cup volume — e.g., 34DD to 36D to 38C. Sister sizes expand your shopping options!
Share Your Results
Sharing works best on mobile! On desktop, use Copy or Print to save your results!
DifferenceUS CupUK CupEU Cup
0"AAAAAA
1"AAA
2"BBB
3"CCC
4"DDD
5"DD/EDDE
6"DDD/FEF
7"DDDD/GFG
8"HFFH
9"IGI
10"JGGJ
11"KHK
12"LHHL
13"MJM
14"NJJN
15"OKO
16"PKKP

How Cup Size Is Calculated

Cup Size = Bust Measurement - Band Measurement

Example: 38" bust - 34" band = 4" difference = D Cup

Bra Fitting After Mastectomy

Going through a mastectomy journey? Finding the right bra and breast prosthesis can feel overwhelming — but you don't have to figure it out alone. We have put together a compassionate, expert guide covering everything from mastectomy bra features to prosthesis types, fitting timing, and your insurance rights.

Read Our Mastectomy Guide

Questions About Your Size?

Need help understanding your results? With over 15 years of professional bra fitting experience, we have got you covered!

Contact Us

Find a Drop Off Location or Ambassador Near You

Ready to recycle your old bras or want a professional fitting? Our Ambassadors are bra fit experts who can help you find the perfect size for your body type — and their stores are drop off locations too!

Find a Location or Ambassador Near Me

Can't Find a Drop Off? Mail Your Bras to Us!

Can't make it to a drop off location? No problem! You can mail your gently used bras directly to us. It's quick, easy, and every bra you send helps support women and girls in need!

Recycle Your Bras Now

Thank You

Thank you for using our bra size calculator. Remember — dignity starts with feeling good undie-neath!

Learn More