To size wearing an undergarment Tzizit, use the Chart below.
| Talit Katan Size | Size | Size in Inches |
| 3 | 10" | |
| 4 | 12" | |
| 5 | 14" | |
| 6 | 16" | |
| 7 | 18" but shorter | |
| 18 | Adult Small | 18 X 46" |
| 20 or No. 8 | Adult Medium | 20 X 50" |
| 22 | Adult Large | 22 X 52" |
| 24 or No. 9 | Adult X-Large | 24 X 53" |
| 26 | Adult XX-Large | 26 X 58" |
| 28 | Adult XXX-Large | 28 X 60" |