28B bra size
28B pairs band 28 with cup B: the cup marks a 2 in difference between your bust and band, rounded to whole inches.
US 28B · UK 28B
- Difference2 in5.1 cm
- Underbust, underbust method27 to 29 in68.58 to 73.66 cm
- Bust for this cup29.5 to 30.5 in74.93 to 77.47 cm
Each range includes its first figure and stops just short of its last.
Which measurements give a 28B
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 | 29.5 to 30.5 in |
| Add-4 method | 22.5 to 24.5 in | 57.15 to 62.23 cm | 29.5 to 30.5 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.
28B in six sizing systems
| System | Band | Cup | Size |
|---|---|---|---|
| US | 28 | B | 28B |
| UK | 28 | B | 28B |
| EU | 60 | B | 60B |
| FR/BE | 75 | B | 75B |
| AU/NZ | 6 | B | 6B |
| JP | 60 | C | 60C |
Bands and letters are label equivalents, not body measurements. JP letters vary by brand.
Sister sizes of 28B
A sister size moves the band one step and the cup one letter the other way.
- 1 band up30A
- 2 bands up32AA
For this label, your bust from 29.5 to 30.5 in falls in cup B under both the underbust method and add-4 method. That bust interval belongs to band 28 in each calculation.
Published charts disagree on which underbust range leads to band 28: the underbust method uses 27 in up to but not including 29 in, while the add-4 method uses 22.5 in up to but not including 24.5 in. These ranges do not overlap, so no underbust gives 28 by both methods. The EU method places the corresponding label at 60B, using centimetres and a band number that advances every 5 cm.
For the same cup difference, the EU label is 60B. This label therefore reflects how the methods assign band numbers differently, even when they describe the same size.
Questions
What does 28B mean?
28B is a band of 28 with a cup that stands for a difference of 2 in (5.1 cm) between bust and band in US sizing.
What measurements give a 28B?
By the underbust method, an underbust of 27 to 29 in (68.58 to 73.66 cm) gives band 28, and a bust of 29.5 to 30.5 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 28B?
The sister sizes of 28B are 30A and 32AA. Each step up in band takes the cup one letter down, and each step down takes it one letter up.