Bra Size Chart
Read your band from your underbust and your cup from the difference between your bust and underbust. Inches and centimeters, with US, UK, EU, FR, AU and JP equivalents.
Last reviewed on 28 April 2026.
Every bra size is built from two measurements. The band is the snug measurement around your ribcage, just under the bust. The cup is the difference between your full bust and that band measurement. The two charts below convert each measurement into a size; if you have not measured yet, start with how to measure your bra size or skip straight to the calculator.
Band size chart (underbust → band)
Find your underbust measurement, then read across for the band number in each system. Bands are even numbers; round to the nearest one.
| Underbust (in) | Underbust (cm) | US / UK | EU / JP | FR | AU |
|---|---|---|---|---|---|
| 27–28 | 68–73 | 28 | 60 | 75 | 6 |
| 29–30 | 74–78 | 30 | 65 | 80 | 8 |
| 31–32 | 79–83 | 32 | 70 | 85 | 10 |
| 33–34 | 84–88 | 34 | 75 | 90 | 12 |
| 35–36 | 89–93 | 36 | 80 | 95 | 14 |
| 37–38 | 94–98 | 38 | 85 | 100 | 16 |
| 39–40 | 99–103 | 40 | 90 | 105 | 18 |
| 41–42 | 104–108 | 42 | 95 | 110 | 20 |
| 43–44 | 109–113 | 44 | 100 | 115 | 22 |
| 45–46 | 114–118 | 46 | 105 | 120 | 24 |
| 47–48 | 119–123 | 48 | 110 | 125 | 26 |
Cup size chart (bust − underbust → cup)
Subtract your underbust from your full bust and find the difference below. Cup letters match across systems up to D, then diverge.
| Difference | US | UK / AU | EU / FR / JP |
|---|---|---|---|
| 0 in (0 cm) | AA | AA | AA |
| 1 in (2.5 cm) | A | A | A |
| 2 in (5 cm) | B | B | B |
| 3 in (7.5 cm) | C | C | C |
| 4 in (10 cm) | D | D | D |
| 5 in (12.5 cm) | DD | DD | E |
| 6 in (15 cm) | DDD / F | E | F |
| 7 in (18 cm) | G | F | G |
| 8 in (20 cm) | H | FF | H |
Note: cup letters above D vary by brand, especially in US sizing where DDD, DDDD, and F/G are used inconsistently. The conversion chart shows how each system maps step by step.
Rather not do the arithmetic? Enter your two measurements:
Calculate My SizeFind the guide for your exact size
Each size on BraCalc has its own page with measurements, sister sizes, international conversions, and fit notes. Jump to a few common ones below, or open the full bra size index.
32B · 32C · 34B · 34C · 34D · 34DD · 36C · 36D · 36DD · 38C · 38D · 40D
Frequently asked questions
How do I read a bra size chart?
Use two measurements. Find your underbust in the band table to get your band number. Then subtract your underbust from your full bust and find that difference in the cup table to get your cup letter. Together they make your size, such as 34C.
What is the average bra size?
Average measured size has drifted upward over time and varies by country, but in the US and UK it is commonly cited around a 34DD/34E. Averages are not targets — the right size is whatever your own measurements give.
Is a bra size chart the same in every country?
No. Band numbers differ (the US and UK use inches, the EU and Japan use centimeters, France adds 15 to the EU number, Australia uses a small even scale) and cup letters diverge above D. The conversion chart lines them up side by side.