28A bra size
28A means band 28 with cup A: the cup represents a difference of 1 in between your bust and band.
US 28A · UK 28A
- Difference1 in2.5 cm
- Underbust, underbust method27 to 29 in68.58 to 73.66 cm
- Bust for this cup28.5 to 29.5 in72.39 to 74.93 cm
Each range includes its first figure and stops just short of its last.
Which measurements give a 28A
The label is a band and a cup, not a body measurement. Each of the three published rules turns the same label into different measurements.
| Method | Underbust (in) | Underbust (cm) | Bust (in) |
|---|---|---|---|
| Underbust method | 27 to 29 in | 68.58 to 73.66 cm | 28.5 to 29.5 in |
| Add-4 method | 22.5 to 24.5 in | 57.15 to 62.23 cm | 28.5 to 29.5 in |
| EU method, band 60 | 22.64 to 24.61 in | 57.5 to 62.5 cm | Cup read in cm |
Each range includes its first figure and stops just short of its last.
28A in six sizing systems
| System | Band | Cup | Size |
|---|---|---|---|
| US | 28 | A | 28A |
| UK | 28 | A | 28A |
| EU | 60 | A | 60A |
| FR/BE | 75 | A | 75A |
| AU/NZ | 6 | A | 6A |
| JP | 60 | Not listed | Not listed |
Bands and letters are label equivalents, not body measurements. JP letters vary by brand.
Sister sizes of 28A
A sister size moves the band one step and the cup one letter the other way.
- 1 band up30AA
For 28A, cup A corresponds to a bust range of 28.5 to 29.5 in, with the upper endpoint excluded. The difference is your bust minus the band, rounded to whole inches for this label. The label 28A therefore pairs band 28 with a cup based on that difference. US and UK tags use the same cup letters for 28A, so the letter stays A in both systems.
For 28A, the cup letter is A on US, UK, EU, FR/BE and AU/NZ tags. Published charts disagree about which band methods assign to the same body: the underbust method and add-4 method give band 28 from underbust ranges that do not overlap. The EU method gives this label’s EU counterpart as 60A, using centimetres. These system labels preserve the cup letter for this size, although the band number changes across some tags.
For 28A, the listed sister size is 30AA: its band moves one step up and its cup letter moves one step down. The JP entry for 28A has no cup letter listed at this difference, and one chart reports that you should check the brand. The listed labels for 28A also include 75A in FR/BE and 6A in AU/NZ, while JP lists 60 with no cup label.
Questions
What does 28A mean?
28A is a band of 28 with a cup that stands for a difference of 1 in (2.5 cm) between bust and band in US sizing.
What measurements give a 28A?
By the underbust method, an underbust of 27 to 29 in (68.58 to 73.66 cm) gives band 28, and a bust of 28.5 to 29.5 in gives this cup. By the add-4 method, band 28 comes from an underbust of 22.5 to 24.5 in. Each range includes its first figure and stops just short of its last.
What are the sister sizes of 28A?
The sister sizes of 28A are 30AA. Each step up in band takes the cup one letter down, and each step down takes it one letter up.