How to Calculate Button Size

Calculating Button Sizes

Button Size

Button sizes are recognized worldwide with “L” or “ligne” which is a French term to measure length. A ligne measurement starts at 1 and is abbreviated to 1L. ligne is a linear unit (1/40 inch) used to measure diameter of buttons. The L is measured in 0.025 millimeters or 0.635 inches. The L is measured across the diameter of the button using the widest portion.

Button sizes can vary from 10L (6.35mm to 0.25mm) up to 60L (38.1mm to 1500mm) or larger.

How to measure the button

The most common way to measure buttons is with vernier caliper. The vernier caliper is a tool used to measure round and cylindrical objects. Its adjustable jaws hold your button in place and can get an exact measurement.

  • If you’re using a round button :- the measurement is the diameter of the button.
  • If you’re using shaped button (oblong or an oval):- the measurement will be the longest edge or diameter.

Most vernier calipers use metric and imperial measurements. Not ligne, unfortunately. So if you’re working in ligne, you’ll need to convert your sizes.

With the help of below method you can calculate button size easily Before calculating button line we should know following details:

  • 1 inches = 40 ligne = 2.54 cm,
  • 1 ligne = 0.635 mm

So If the Button measurement is 15 mm (vernier caliper or tape reading)

  • 1 ligne = 0.635 mm
  • Button die (in mm) / 0.635 = button ligne
  • 15 mm / 0.635 = 23.62 = 24 L

So if required you could calculate button diameter from button ligne also. 

  • Button diameter = Button Ligne X 0.635
  • 23.62 (24) X 0.635= 15 mm

Button Size Matrix

Line                      InchesMillimeters
10-line0.2506.35mm
14-line 0.3629.2mm
16-line0.41310.5mm
18-line 0.45711.6mm
20-line0.50012.7mm
21-line0.53113.5mm
22-line0.55914.2mm
23-line0.58314.8mm
24-line0.59015.0mm
27-line0.66116.8mm
28-line0.70117.8mm
30-line0.74819.0mm
32-line0.80720.5mm
34-line0.84621.5mm
36-line0.90222.9mm
40-line1.00025.4mm
60-line1.50038.1mm
80-line2.00050.8mm
100-line2.50063.5mm
120-line3.00076.2mm  

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1 Response

  1. Avatar Gagan Seth says:

    Very help full educational

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