40C bra size
40C means band 40 with cup C, a 3 in difference between your bust and band; this size’s bust range is 42.5 to 43.5 in.
US 40C · UK 40C
- Difference3 in7.6 cm
- Underbust, underbust method39 to 41 in99.06 to 104.14 cm
- Bust for this cup42.5 to 43.5 in107.95 to 110.49 cm
Each range includes its first figure and stops just short of its last.
Which measurements give a 40C
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 | 39 to 41 in | 99.06 to 104.14 cm | 42.5 to 43.5 in |
| Add-4 method | 34.5 to 36.5 in | 87.63 to 92.71 cm | 42.5 to 43.5 in |
| EU method, band 90 | 34.45 to 36.42 in | 87.5 to 92.5 cm | Cup read in cm |
Each range includes its first figure and stops just short of its last.
40C in six sizing systems
| System | Band | Cup | Size |
|---|---|---|---|
| US | 40 | C | 40C |
| UK | 40 | C | 40C |
| EU | 90 | C | 90C |
| FR/BE | 105 | C | 105C |
| AU/NZ | 18 | C | 18C |
| JP | 90 | D | 90D |
Bands and letters are label equivalents, not body measurements. JP letters vary by brand.
Sister sizes of 40C
A sister size moves the band one step and the cup one letter the other way.
For 40C, the cup letter names the difference between your bust and band. Within this size’s bust range of 42.5 to 43.5 in, both the underbust method and add-4 method give cup C.
For this cup difference, US, UK, EU, FR/BE, and AU/NZ use C, while the JP label is 90D. Published charts disagree on how an underbust maps to a band: the underbust method and add-4 method assign band 40 from separate ranges, while the EU method assigns band 90 from 34.5 to 36.4 in.
The JP D for 40C differs from the C used for this cup difference in EU labels, and JP letters vary by brand. The sister size 38D moves the band down and the cup up; 42B moves the band up and cup down. The listed sister size 44A has no JP label.
Questions
What does 40C mean?
40C is a band of 40 with a cup that stands for a difference of 3 in (7.6 cm) between bust and band in US sizing.
What measurements give a 40C?
By the underbust method, an underbust of 39 to 41 in (99.06 to 104.14 cm) gives band 40, and a bust of 42.5 to 43.5 in gives this cup. By the add-4 method, band 40 comes from an underbust of 34.5 to 36.5 in. Each range includes its first figure and stops just short of its last.
What are the sister sizes of 40C?
The sister sizes of 40C are 36DD, 38D, 42B and 44A. Each step up in band takes the cup one letter down, and each step down takes it one letter up.