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International Button Size Conversion Guide (MM to Ligne)

29. tammi 2025 Lots of Buttons

If you’ve ever shopped for buttons online or worked on an international sewing project, you’ve probably encountered two different sizing systems: millimeters (mm) and ligne. While millimeters are straightforward, ligne can be a bit more confusing. What exactly is a ligne, and how do you convert between the two? In this blog, we’ll break down the international button size conversion process and provide a handy guide to help you navigate the world of button sizes with ease.  

What Is a Ligne?  

Ligne (pronounced "line") is a traditional unit of measurement used primarily in the button and watchmaking industries. Originating in France, it’s based on the Paris inch, which is slightly larger than the modern inch. One ligne is equal to 0.635 mm, and it’s abbreviated as "L" or "Li."  

While ligne is less commonly used today, it’s still the standard for many high-end buttons, especially those made in Europe. Understanding ligne is essential if you’re working with vintage buttons, luxury fashion, or international suppliers.  

Why Do Button Sizes Matter?  

Choosing the right button size is crucial for both functionality and aesthetics. A button that’s too small may not securely fasten your garment, while one that’s too large can look out of proportion. Whether you’re sewing a shirt, crafting a coat, or designing a handbag, knowing how to convert between mm and ligne ensures you’ll find the perfect button for your project.  

Button Size Conversion Chart  

To make your life easier, here’s a quick reference chart for converting between millimeters and ligne:  

| Millimeters (mm) | Ligne (L) | Common Uses                          |  
|------------------|-----------|--------------------------------------|  
| 11 mm            | 14 L      | Women’s blouses, lightweight fabrics |  
| 12 mm            | 15 L      | Shirts, dresses, children’s clothing |  
| 13 mm            | 16 L      | Men’s shirts, medium-weight fabrics  |  
| 14 mm            | 18 L      | Jackets, coats, heavier fabrics      |  
| 16 mm            | 20 L      | Coats, duffle bags, outerwear        |  
| 18 mm            | 23 L      | Coats, bags, decorative buttons      |  
| 20 mm            | 25 L      | Statement pieces, heavy coats        |  
| 22 mm            | 28 L      | Oversized designs, decorative uses   |  
| 25 mm            | 32 L      | Statement coats, upholstery          |  
| 28 mm            | 36 L      | Upholstery, large decorative buttons |  

How to Measure Buttons  

If you’re unsure about a button’s size, here’s how to measure it:  

1. Diameter 
   Use a ruler or caliper to measure the button’s diameter in millimeters. This is the most common way to determine button size.  

2. Ligne Conversion 
   To convert mm to ligne, divide the diameter in millimeters by 0.635. For example, a 16 mm button is approximately 25 L (16 ÷ 0.635 = 25.2).  

3. Buttonhole Size 
   When selecting buttons, make sure the buttonhole is slightly larger than the button’s diameter to ensure a proper fit.  

Tips for Choosing the Right Button Size  

1. Consider the Fabric 
   Lightweight fabrics like silk or chiffon pair well with smaller buttons (11-14 mm), while heavier fabrics like wool or denim require larger buttons (16-25 mm).  

2. Think About Proportion  
   Buttons should complement the garment’s scale. For example, a small button on a large coat can look out of place, while a large button on a delicate blouse may overwhelm the design.  

3. Check the Pattern
   If you’re following a sewing pattern, it will often specify the recommended button size. Use this as a starting point, but don’t be afraid to adjust based on your preferences.  

4. Test Before Committing
   If you’re unsure about a button’s size, test it on a scrap of fabric before sewing it onto your garment.  

The Global Language of Buttons  

Understanding button sizes is like learning a new language—it opens up a world of possibilities. Whether you’re shopping for buttons in Paris, Tokyo, or New York, knowing how to convert between mm and ligne ensures you’ll always find the perfect fit.  

Conclusion  

Buttons may be small, but they play a big role in fashion and design. By mastering the art of button size conversion, you can confidently tackle any project, from vintage restorations to modern creations. So the next time you’re faced with a button size dilemma, refer back to this guide and sew with confidence!  

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