Check the correspondence with your usual pant size. If you are between two sizes, choose the larger size to be more comfortable.
| BIOpads | US-CA | UK-AU | EU | Waist (inch) | Hips (inch) | Height (inch) |
| 9-10 yr | 28.7-30.7 | 4 ft 5 in | ||||
| 11-12 yr | 31.1-33.1 | 5 ft | ||||
| 13-14 yr | 33.5-35.8 | 5 ft 3 in | ||||
| XS | 2 | 6 | 34 | 23-25 | 35-36 | |
| S | 4 | 8 | 36 | 25-26 | 37-38 | |
| M | 6 | 10 | 38 | 26-28 | 39-40 | |
| L | 8 | 12 | 40 | 28-30 | 41-42 | |
| XL | 10 | 14 | 42 | 30-31 | 43-45 | |
| 2X | 12 | 16 | 44 | 31-33 | 46-47 | |
| 3X | 14 | 18 | 46 | 33-35 | 48-49 | |
| 4X | 16 | 20 | 48 | 35-36 | 50-52 | |
| 5X | 18 | 22 | 50 | 36-38 | 53-54 | |
| 6X | 20 | 24 | 52 | 38-40 | 55-57 |
