IDS Ladies Shoe Size Chart
| UK (IDS) | European | American | Centimeters |
| 1 | 33 | 3 | 20.8 |
| 1.5 | 33.5 | 3.5 | 21.2 |
| 2 | 34 | 4 | 21.6 |
| 2.5 | 35 | 4.5 | 22 |
| 3 | 35.5 | 5 | 22.4 |
| 3.5 | 36 | 5.5 | 22.8 |
| 4 | 37 | 6 | 23.2 |
| 4.5 | 37.5 | 6.5 | 23.6 |
| 5 | 38 | 7 | 24 |
| 5.5 | 38.5 | 7.5 | 24.4 |
| 6 | 39 | 8 | 24.8 |
| 6.5 | 40 | 8.5 | 25.2 |
| 7 | 40.5 | 9 | 25.6 |
| 7.5 | 41 | 9.5 | 26 |
| 8 | 42 | 10 | 26.4 |
* For a professional fit on open toe shoes, where the toes are a little over the front platform, consider a 1/2 size smaller.