34B bra size
34B is band 34 with cup B, marking a 2 in difference between your bust and band after rounding to whole inches.
US 34B · UK 34B
- Difference2 in5.1 cm
- Underbust, underbust method33 to 35 in83.82 to 88.9 cm
- Bust for this cup35.5 to 36.5 in90.17 to 92.71 cm
Each range includes its first figure and stops just short of its last.
Which measurements give a 34B
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 | 33 to 35 in | 83.82 to 88.9 cm | 35.5 to 36.5 in |
| Add-4 method | 28.5 to 30.5 in | 72.39 to 77.47 cm | 35.5 to 36.5 in |
| EU method, band 75 | 28.54 to 30.51 in | 72.5 to 77.5 cm | Cup read in cm |
Each range includes its first figure and stops just short of its last.
34B in six sizing systems
| System | Band | Cup | Size |
|---|---|---|---|
| US | 34 | B | 34B |
| UK | 34 | B | 34B |
| EU | 75 | B | 75B |
| FR/BE | 90 | B | 90B |
| AU/NZ | 12 | B | 12B |
| JP | 75 | C | 75C |
Bands and letters are label equivalents, not body measurements. JP letters vary by brand.
Sister sizes of 34B
A sister size moves the band one step and the cup one letter the other way.
- 2 bands down30D
- 1 band down32C
- 1 band up36A
- 2 bands up38AA
For 34B, the bust range paired with cup B is 35.5 to 36.5 in. The underbust method and add-4 method both place this bust range at band 34, although their underbust ranges for that band do not overlap.
The cup letter stays B in the US, UK, EU, FR/BE and AU/NZ labels for 34B, while JP marks it C. Published charts disagree on the band assigned to the same body: the underbust method follows underbust, the add-4 method rounds underbust before adding to the band, and the EU method uses centimetres with bands spaced every 5 cm.
For 34B, 32C is the sister size with a smaller band and a larger cup letter; 36A pairs a larger band with a smaller cup letter. The JP label is 75C, and JP letters vary by brand.
Questions
What does 34B mean?
34B is a band of 34 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 34B?
By the underbust method, an underbust of 33 to 35 in (83.82 to 88.9 cm) gives band 34, and a bust of 35.5 to 36.5 in gives this cup. By the add-4 method, band 34 comes from an underbust of 28.5 to 30.5 in. Each range includes its first figure and stops just short of its last.
What are the sister sizes of 34B?
The sister sizes of 34B are 30D, 32C, 36A and 38AA. Each step up in band takes the cup one letter down, and each step down takes it one letter up.