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Bra Size Finder

Find your bra size from two measurements.

How it works Report a problem

Bra Size Finder

Find your perfect fit — band, cup & international conversions

🇺🇸 US 🇬🇧 UK 🇪🇺 EU 🇫🇷 FR/BE 🇦🇺 AU/NZ 🇯🇵 JP
Measurement Unit
How to Measure
1
Underbust — Wrap tape measure snugly around your ribcage, directly under your breasts. Keep tape parallel to the floor. Breathe normally.
2
Bust/Overbust — Measure around the fullest part of your chest (at nipple level). Keep the tape slightly loose and parallel to the floor.
3
Wear an unpadded bra or no bra for the most accurate measurements. Measure twice!
Enter Your Measurements
① Underbust (Band)
Snugly under your breasts
in
222834404650
② Overbust (Bust)
At the fullest part of your chest
in
243240485558
Your Recommended US/UK Size
34B
Band: 34 · Cup: B · Diff: 1 inch
Cup Difference: 1 in
🌍 International Sizes
Sister Sizes
Sister sizes have the same cup volume but different band sizes. If your bra doesn't fit perfectly, try a sister size.
Cup Size Reference Chart
Diff (in)US/UK CupEU CupFR/BE CupJP Cup
✅
Good fit signs: Straps stay up without digging in. Band is horizontal all the way around.
⚠️
Signs you need a bigger cup: Underwire sits on breast tissue, cups overflow.
💡
Pro tip: 80% of women wear the wrong bra size. A professional fitting takes 5 minutes.

About the Bra Size Finder

Find your bra size from two measurements.

How to use the Bra Size Finder

  1. Choose Inches or Centimeters.
  2. Enter your underbust and bust measurements.
  3. Press Find My Perfect Size. Use Show to see other size systems.

Formula and method

Band size comes from the underbust measurement. Cup size comes from the difference between the bust and the underbust.

Tips

  • Measure in a supportive bra or without one, with the tape level and snug.
  • Sizes vary by brand, so try on when you can.

Frequently asked questions

Why does my size vary between brands?
Brands cut bras differently. Use the result as a starting point.