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What is Button Ligne
Ligne is a French word meaning “line”, and button ligne as a measurement system for button size was first used by German button manufacturers in the 9th century, although it finally became the standard measurement much later by the 18th century.

Ligne is expressed as “L”. If you ever encounter 10L in a button, that means 10 ligne, an equal of 1/4 inch in diameter.

How to Calculate Button Ligne
While measuring ligne unit might not be familiar to the most of us, we are all familiar with the modern metric system in meter or inch. To calculate button ligne, all we need to do is to convert it into millimeters or inches.

As the standard, 40 ligne or 40L equals 1 inch or 25 milimiters. So 1L equals 0.635mm. To calculate button size in ligne, simply divide the diameter of the button (in millimeters) by 0.635.

Button Ligne= button diameter (mm)/0.635

For example, if your button diameter is 18mm, the calculation becomes:
Ligne=18/0.635
=28.34

Rounded down, the button ligne is 28L