34A bra size
34A means band 34 with cup A, where the cup marks a difference of 1 in between your bust and the band.
US 34A · UK 34A
- Difference1 in2.5 cm
- Underbust, underbust method33 to 35 in83.82 to 88.9 cm
- Bust for this cup34.5 to 35.5 in87.63 to 90.17 cm
Each range includes its first figure and stops just short of its last.
Which measurements give a 34A
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 | 34.5 to 35.5 in |
| Add-4 method | 28.5 to 30.5 in | 72.39 to 77.47 cm | 34.5 to 35.5 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.
34A in six sizing systems
| System | Band | Cup | Size |
|---|---|---|---|
| US | 34 | A | 34A |
| UK | 34 | A | 34A |
| EU | 75 | A | 75A |
| FR/BE | 90 | A | 90A |
| AU/NZ | 12 | A | 12A |
| JP | 75 | Not listed | Not listed |
Bands and letters are label equivalents, not body measurements. JP letters vary by brand.
Sister sizes of 34A
A sister size moves the band one step and the cup one letter the other way.
- 2 bands down30C
- 1 band down32B
- 1 band up36AA
For 34A, a bust from 34.5 to 35.5 in falls within the range shown for cup A on band 34. The underbust method and add-4 method both use that bust range, though they assign band 34 from separate underbust ranges that do not overlap.
The sister size 32B pairs a lower band label with a higher cup letter than 34A. The sister size 36AA reverses that direction, with a higher band label and a lower cup letter. Published charts disagree on which band the same body receives: the underbust method uses the underbust, the add-4 method rounds it to a whole inch before adding, and the EU method uses centimetres and bands spaced every 5 cm.
The 34A label maps to 75A in the EU system, while the JP chart has no cup letter listed for this difference and says to check the brand. The JP sister size 70C appears for 32B, while the JP entry for 36AA is not listed.
Questions
What does 34A mean?
34A is a band of 34 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 34A?
By the underbust method, an underbust of 33 to 35 in (83.82 to 88.9 cm) gives band 34, and a bust of 34.5 to 35.5 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 34A?
The sister sizes of 34A are 30C, 32B and 36AA. Each step up in band takes the cup one letter down, and each step down takes it one letter up.