A 1 inch button measures about 1.0 inch (25 mm) across its face. In sewing sizes, that’s often listed as 40L. For pin-back badge systems, the matching components are typically labeled 25 mm as well. Thickness and overall profile can vary by material—wood, resin, metal, or fabric-covered—so two 1 inch buttons may feel different in use.

• Diameter equivalents: 1 inch ≈ 25 mm ≈ 40L (sewing).
• Measure across the widest point of the button head.
• Check product titles/descriptions for mm or L to confirm.

If you’re pairing with a tool or garment, matching by millimeters or lignes can help reduce sizing mix-ups.

There isn’t a single “standard” because button size depends on the project. On this page, common options include 1 inch (25 mm/40L) sewing buttons, 1.25 inch (32 mm) badge parts for button makers, and larger statement sizes like 1.5 inch (often listed as 60L). Smaller sizes are typical for lightweight shirts, while larger diameters suit coats, bags, and crafts.

• Match sewing buttons to your buttonholes and fabric thickness.
• For pin-back buttons, use the machine’s specified diameter (e.g., 25 mm or 32 mm).
• Look for sizes listed in mm or lignes (L) to compare across listings.

A 1 inch buttonhole typically works with a button around 1 inch (about 25 mm or 40L), but fit can vary based on button shape and thickness.

• Flat, 4-hole buttons often pass through openings close to their listed diameter.
• Domed or shank-style buttons can feel tighter and may need a slightly roomier opening.
• Testing the actual button with a scrap opening is a practical way to check.

Patterns and garments differ, so comparing the product’s listed diameter (mm or L) to your buttonhole is a helpful way to confirm compatibility before sewing.

For pin-back button badges, match your supplies to a 1 inch (25 mm) button maker.

1. Gather 25 mm components: shells, mylar, and pin backs labeled for 1 inch.
2. Print or cut artwork to the template size recommended for your machine.
3. Load the shell, artwork, and mylar into the die, then press as instructed.
4. Place the pin back and complete the crimp/press cycle.

Using the correct 25 mm parts and following your tool’s guide can support consistent results. Paper weight, artwork bleed, and even pressure make a difference. Work carefully around moving parts and pins.

They serve different purposes even though both are labeled by diameter.

• Sewing buttons (1 inch/25 mm/40L): Usually flat with 2 or 4 holes or a shank. They’re stitched onto garments, bags, or craft projects.
• Badge buttons (1 inch/25 mm): Pin-back buttons made with a button maker using shells, mylar, and pin backs. They attach with a safety pin, not stitching.

Before buying, confirm the product type—sewing vs. badge parts—and match the size (e.g., 25 mm) to your project or machine. This helps avoid mixing up sewing fasteners with pin-back components.