34D bra size
34D names band 34 and cup D; the cup represents a 4 in difference between your bust and the band, rounded to whole inches.
US 34D · UK 34D
- Difference4 in10.2 cm
- Underbust, underbust method33 to 35 in83.82 to 88.9 cm
- Bust for this cup37.5 to 38.5 in95.25 to 97.79 cm
Each range includes its first figure and stops just short of its last.
Which measurements give a 34D
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 | 37.5 to 38.5 in |
| Add-4 method | 28.5 to 30.5 in | 72.39 to 77.47 cm | 37.5 to 38.5 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.
34D in six sizing systems
| System | Band | Cup | Size |
|---|---|---|---|
| US | 34 | D | 34D |
| UK | 34 | D | 34D |
| EU | 75 | D | 75D |
| FR/BE | 90 | D | 90D |
| AU/NZ | 12 | D | 12D |
| JP | 75 | E | 75E |
Bands and letters are label equivalents, not body measurements. JP letters vary by brand.
Sister sizes of 34D
A sister size moves the band one step and the cup one letter the other way.
- 2 bands down30DDD
- 1 band down32DD
- 1 band up36C
- 2 bands up38B
For 34D, your bust falls in cup D from 37.5 to 38.5 in under both the underbust method and the add-4 method. The number on the tag identifies the band, while your measurements determine the band through the method used.
Across systems, 34D keeps the D cup in US, UK, EU, FR/BE and AU/NZ, though the band labels change. EU uses 75D, FR/BE uses 90D, and AU/NZ uses 12D. JP labels this size 75E. Published charts disagree on how the same underbust maps to a band: the underbust method uses it directly, while the add-4 method and EU method apply different rules.
For 34D, the US sister size with a smaller band is 32DD/E, and the one with a larger band is 36C. The table also includes 30DDD/F and 38B, two band steps away.
Questions
What does 34D mean?
34D is a band of 34 with a cup that stands for a difference of 4 in (10.2 cm) between bust and band in US sizing.
What measurements give a 34D?
By the underbust method, an underbust of 33 to 35 in (83.82 to 88.9 cm) gives band 34, and a bust of 37.5 to 38.5 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 34D?
The sister sizes of 34D are 30DDD, 32DD, 36C and 38B. Each step up in band takes the cup one letter down, and each step down takes it one letter up.