Ligne Number Calculator | Calculate Button Size

Ligne number is essential for selecting the right-sized buttons and calculating proper costing. Let’s calculate button size with Ligne number:

Ligne Number Calculator

Ligne Number Calculator

N.B: The Ligne number is always a integer number.


Unit of measurement of Button is called Ligne number. 1 Lingne = 0.635 mm

  • 1 inch = 40 Ligne (1 inch = 2.54 cm) 
  • 1 ligne = 25.4 mm/40 = .635mm 
  • The measurement is from outside edge to outside edge of the button 
  •  Button hole length =Button diameter + Thickness or  height of the button. 
Ligne Number Calculator
Button Size Calculation System

To find out the size of a button in ligne, just change it to millimeters or inches. As a rule, 40 ligne or 40L is the same as 1 inch or 25 millimeters. This means 1L equals 0.635mm. To figure out the button size in ligne, just divide the button’s diameter (in millimeters) by 0.635.

Relation Between Ligne, Millimeters, and Inches

Ligne Conversion Table

Relation Between Ligne, Millimeters, and Inches

Ligne (L) Millimeters (mm) Inches
1 0.635 0.025
10 6.35 0.25
20 12.7 0.5
30 19.05 0.75
40 25.4 1.0
50 31.75 1.25
60 38.1 1.5
70 44.45 1.75
80 50.8 2.0
90 57.15 2.25
100 63.5 2.5


Question: Figure out ligne no of a button with 10mm Dia? 

Answer: To figure out the ligne number of a button with a diameter of 10mm, you can use the formula:

Ligne= (Diameter in mm/Ligne per mm)

In this case, the ligne per mm is given as 0.635 mm. So, for a button with a diameter of 10 mm:

Ligne= (10 mm/0.635 mm)


So, the ligne number for a button with a diameter of 10 mm is approximately 15.748. Since ligne numbers are typically whole numbers, you might round it to the nearest whole number. In this case, the ligne number would be 16.

How to Use the Ligne Number Calculator?

  1. Input the diameter of your button in millimeters.
  2. Click the “Calculate Ligne Number” button.
  3. Receive an accurate ligne number, rounded to the nearest whole number, ensuring compatibility with your chosen buttons.

Application of Ligne Number:

  • Garment Design: Seamlessly integrate buttons of the right size for a polished and professional look.
  • Uniformity: Maintain consistency in button sizes across a range of garments for a cohesive aesthetic.
  • Ordering: Streamline the ordering process by specifying ligne numbers when purchasing buttons in bulk.

Empower your sewing projects with precision and finesse. Our Ligne Number Calculator simplifies the intricate process of button selection, ensuring your creations are not only stylish but also impeccably crafted. Elevate your sewing experience today!

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