Ligne, French word for Line, is the traditional unit of measure for measuring buttons.
Ligne |
mm |
inches |
| 10L | 7mm | 1/4″ |
| 12L | 8mm | 5/16″ |
| 14L | 9mm | 3/8″ |
| 16L | 10mm | 3/8″ |
| 18L | 11mm | 7/16″ |
| 20L | 12mm | 1/2″ |
| 22L | 14mm | 9/16″ |
| 24L | 15mm | 5/8″ |
| 26L | 16mm | 5/8″ |
| 28L | 18mm | 11/16″ |
| 30L | 19mm | 3/4″ |
| 32L | 20mm | 13/16″ |
| 34L | 21mm | 7/8″ |
| 36L | 23mm | 15/16″ |
| 38L | 24mm | 15/16″ |
| 40L | 25mm | 1″ |
| 48L | 30mm | 1 3/16″ |
| 50L | 32mm | 1 1/4″ |
| 54L | 34mm | 1 3/8″ |
| 60L | 38mm | 1 1/2″ |
| 80L | 51mm | 2″ |