How do calculate button ligne from mm

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How do calculate button ligne from mm (milimetre)

If Button length (dia) is 12.7 mm then Button ligne will be ?

Rule:

Button dia (in mm) / 0.635 = button ligne

12.7 mm / 0.635 = 20 L        (L = ligne )

Result = 20 L 


Chart of button ligne (mm to ligne)

Thanks & best regards

Bipul