Size guide & bra calculator
Two measurements, thirty seconds, and a fit that feels made for you. Use the calculator below or browse our detailed size charts.
Bra size calculator
Calculate your size
How to measure
- Underbust (band)Wrap a soft tape snugly around your ribcage, directly under your bust. Keep it level and exhale.
- Fullest bustMeasure loosely around the fullest part of your bust while wearing a non-padded bra.
- CalculateThe difference between the two measurements gives your cup size — or let the calculator do it.
Band size chart
| Band size | Underbust (in) | Underbust (cm) |
|---|---|---|
| 30 | 29–30 | 74–76 |
| 32 | 31–32 | 79–81 |
| 34 | 33–34 | 84–86 |
| 36 | 35–36 | 89–91 |
| 38 | 37–38 | 94–97 |
| 40 | 39–40 | 99–102 |
Cup size chart
Subtract your underbust from your fullest bust measurement:
| Difference | Cup size |
|---|---|
| 1" / 2.5 cm | A |
| 2" / 5 cm | B |
| 3" / 7.5 cm | C |
| 4" / 10 cm | D |
| 5" / 12.5 cm | DD / E |
| 6" / 15 cm | F |
Bralettes, corsets, sleepwear & shapewear (inches)
| Size | US dress | Bust | Waist | Hips |
|---|---|---|---|---|
| XS | 0–2 | 31–32 | 24–25 | 34–35 |
| S | 4–6 | 33–34 | 26–27 | 36–37 |
| M | 8–10 | 35–36 | 28–29 | 38–39 |
| L | 12–14 | 37–39 | 30–32 | 40–42 |
| XL | 16–18 | 40–42 | 33–35 | 43–45 |
| 2XL | 20 | 43–45 | 36–38 | 46–48 |
| 3XL | 22 | 46–48 | 39–41 | 49–51 |
Stylist tip: for shapewear, always choose your usual size — sizing down doesn't give more shaping, only less comfort. Between sizes? Size up. For corsets, size by your natural waist.
Signs your bra doesn't fit
- The band rides up at the back — try a smaller band (and a cup size up).
- Straps dig or slip — adjust them; if the band is right, straps should carry very little weight.
- Spilling over the cups — go up a cup size.
- Gaps or wrinkles in the cups — try a smaller cup or a different style, like a balconette or bralette.
- The centre gore doesn't touch your sternum — usually a sign the cups are too small.
