Duga Fashion

Bra Size Chart: US, UK & EU Sizes With Measurements

Last updated: August 2026

This bra size chart turns two measurements — your underbust and your bust — into your band, your cup, and the equivalent size in the US, UK and EU. Use it alongside the bra size calculator to find and double-check your fit.

How we work these sizes out. Every size on this page is calculated the same way: your band is your underbust measurement (taken snugly under the bust and rounded to the nearest even size), and your cup is the difference between your bust and underbust — about one cup per inch. It is the measurement-first method recommended by professional fitters and bra-fitting communities, and it is the same maths behind our bra size calculator.

How to measure in 20 seconds

  • Underbust: snug around the ribcage directly under the bust — this is your band.
  • Bust: loose around the fullest part — tape parallel to the floor.
  • Subtract: bust minus underbust gives the cup, at about one cup per inch.

Cup size chart (bust − underbust)

Each inch of difference is one cup. Lettering diverges above a D, which is why the same body maps to different letters across regions:

Bust − underbust US UK EU
0–1 in (0–3 cm) AA AA AA
1–2 in (3–5 cm) A A A
2–3 in (5–8 cm) B B B
3–4 in (8–10 cm) C C C
4–5 in (10–13 cm) D D D
5–6 in (13–15 cm) DD DD E
6–7 in (15–18 cm) DDD E F
7–8 in (18–20 cm) G F G
8–9 in (20–23 cm) H FF H
9–10 in (23–25 cm) I G I
10–11 in (25–28 cm) J GG J

Full bra size chart (US)

Find your band down the left, then your bust-minus-underbust difference across the top:

Band \ diff 0″ 1″ 2″ 3″ 4″ 5″ 6″ 7″
28 28AA 28A 28B 28C 28D 28DD 28DDD 28G
30 30AA 30A 30B 30C 30D 30DD 30DDD 30G
32 32AA 32A 32B 32C 32D 32DD 32DDD 32G
34 34AA 34A 34B 34C 34D 34DD 34DDD 34G
36 36AA 36A 36B 36C 36D 36DD 36DDD 36G
38 38AA 38A 38B 38C 38D 38DD 38DDD 38G
40 40AA 40A 40B 40C 40D 40DD 40DDD 40G
42 42AA 42A 42B 42C 42D 42DD 42DDD 42G
44 44AA 44A 44B 44C 44D 44DD 44DDD 44G

Band size conversions

US UK EU FR AU
28 28 60 75 6
30 30 65 80 8
32 32 70 85 10
34 34 75 90 12
36 36 80 95 14
38 38 85 100 16
40 40 90 105 18
42 42 95 110 20
44 44 100 115 22

Cup letters convert too: a US DD is a UK DD but an EU E; a US DDD is a UK E and an EU F. When a brand lists a single country’s sizing, convert the band and the cup together.

How to check the fit is actually right

Numbers get you to the right size on paper; these hands-on checks tell you whether it fits in real life. Do them in front of a mirror, wearing the bra on the loosest hook:

  • Band: it should sit level all the way around, in line with the front. Slide two fingers under it at the back — snug, not loose, no riding up when you raise your arms. The band does roughly 80% of the support work, so this matters most.
  • Cups: do a quick “scoop and swoop” — lean forward, settle everything into the cup, then stand up. There should be no spillage over the top or sides, and no wrinkling or gaping at the edge. Spillage means size up a cup; gaping means size down a cup.
  • Centre gore: the little bridge between the cups should lie flat against your breastbone. If it floats off the body, the cup is usually too small.
  • Straps: you should fit a finger under them comfortably. If they dig in or carry most of the weight, the band is too loose — tighten it or size the band down.
Reading the chart is easier with your numbers in hand — use the calculator, then learn how to fine-tune with the sister size guide.
These figures are a starting point, not a guarantee of fit. Cup lettering and cut vary between brands, and bodies differ in shape as well as measurement, so always try a size on where you can. This guide is for general information and is not medical advice — if you need fitting for a medical reason (for example after surgery), see a professional fitter or clinician.