The right felt fabric thickness depends on what you are making. Use 1mm felt for crafts, appliqué, and kids' projects. Pick 1.5mm to 2mm for plush toys, ornaments, and bags that need some body. Choose 3mm to 5mm for coasters, table pads, and structured items. Thicker felt (6mm and up) is for industrial, padding, and protective uses.
That is the quick answer. The rest of this guide explains how thickness is measured, why density matters as much as thickness, and how to match felt material to your project so you buy the right sheet the first time.
What Does Felt Thickness Mean?
Felt thickness is the distance from the top surface of a sheet to the bottom surface. It is usually listed in millimeters (mm). Some suppliers in the US also list it in inches, so you may see 1/16 inch (about 1.6mm) or 1/8 inch (about 3.2mm).
Thickness changes how felt behaves. Thin felt is soft, easy to cut, and simple to sew by hand. Thick felt holds its shape, stands up on its own, and protects surfaces from scratches and impact. Choosing wrong usually shows up fast. A plush toy made from felt that is too thin can stretch and show stuffing lumps. A coaster made from felt that is too thin will curl and soak through.
How Felt Thickness Is Measured
Most sellers measure thickness with a caliper or a thickness gauge. Felt is soft, so it compresses a little under pressure. This is why two sellers can list the same felt at slightly different thicknesses. A small difference of 0.1mm to 0.2mm is normal and not a quality problem.
For industrial felt, testing is more strict. ASTM D2475 is a well-known standard that covers wool felt and sets out how properties such as thickness, density, and tensile strength are tested. Older SAE felt grades (like F1 to F15) are still used in some industries to describe felt by density and use. You do not need these standards for a craft project, but they show that thickness is only one part of how felt is judged.
Thickness vs Weight (GSM)
Some suppliers list felt by weight instead of thickness. Weight is shown as GSM (grams per square meter) or ounces per square yard. A higher GSM means more fiber is packed into the sheet. Weight and thickness are related, but they are not the same thing. A loose 2mm sheet can weigh less than a tightly packed 1.5mm sheet. If a listing shows both numbers, you get a much clearer picture of how the felt will feel and perform.
Common Felt Fabric Thickness Options
Here is how the most common thicknesses compare and what each one is best for.
| Thickness | Feel | Best For |
|---|---|---|
| 1mm | Soft, flexible, light | Kids' crafts, appliqué, cutouts, scrapbooking, bulletin boards |
| 1.5mm to 2mm | Soft with some body | Plush toys, ornaments, pouches, garlands, hair accessories |
| 3mm | Firm, holds shape | Coasters, bags, wall decor, letter boards, laptop sleeves |
| 4mm to 5mm | Stiff and sturdy | Table pads, trivets, storage bins, structured bags |
| 6mm and up | Dense, rigid | Furniture pads, gaskets, sound dampening, polishing, padding |
1mm Felt
This is the most common thickness for craft felt. Standard 9 x 12 inch craft sheets sold in schools and craft stores are usually around 1mm. It cuts easily with regular scissors, works well with glue, and is cheap enough for large group projects. The tradeoff is strength. It tears more easily and is not a good choice for anything that will be handled a lot.
1.5mm to 2mm Felt
This range is the sweet spot for sewing projects. It is thick enough to hold stitches without pulling apart, but soft enough to sew by hand. Many people who make felt toys and holiday ornaments prefer this range because the finished piece keeps its shape and does not look flimsy.
3mm to 5mm Felt
Felt in this range starts to act more like a firm material than a soft fabric. It can stand upright, hold folds, and protect surfaces. You will need a sharp rotary cutter or craft knife to cut it cleanly. Home sewing machines can handle 3mm felt with a heavy needle, but 5mm is often too thick for most domestic machines.
6mm and Thicker
Thick felt is mainly used in industrial and commercial settings. It is common under furniture legs, in machine parts, as gaskets and seals, and for sound absorption. Industrial wool felt can be made much thicker than 6mm, sometimes over 25mm, for heavy padding and polishing jobs.
How to Choose Felt Thickness by Project Type
The best way to pick thickness is to start with what your project needs to do. Ask yourself three questions. Does it need to bend or stand up? Will it be sewn, glued, or cut with a machine? Will it be handled every day or just displayed?
Kid's Crafts and Classroom Projects
Go with 1mm felt. Children can cut it with safety scissors, and it works with white glue and hot glue. It also comes in the widest range of colors, which matters for classroom work. Because these projects are rarely handled for long, the lower strength is not a problem.
Plush Toys and Soft Sewing
Choose 1.5mm to 2mm. Stuffed toys put pressure on seams, and thin felt can stretch or let the stuffing show through. A slightly thicker sheet gives a smoother, more finished look. If the toy is for a young child, also look for felt that is labeled safe for toys and check the fiber content.
Holiday Ornaments and Decorations
For ornaments, 2mm is a good choice. It holds embroidery and beads without sagging, and the ornament keeps its shape when it hangs. For flat garlands and banners, 1mm is often enough since they do not need to stand on their own.
Bags, Pouches, and Organizers
Structured items need body. Use 3mm for bags, laptop sleeves, and desk organizers. For a soft pouch or a pencil case, 2mm works well. If your design needs crisp corners and straight sides, go up to 4mm or 5mm.
Coasters, Trivets, and Table Pads
These need to absorb moisture and protect surfaces from heat and scratches. Use 3mm to 5mm. Thin felt will curl at the edges and will not protect your table from a hot pot. A 5mm wool felt trivet is a common choice because wool handles heat better than synthetic fibers.
Furniture Pads and Floor Protection
Use 5mm or thicker. The felt needs to stay in place and cushion the weight of the furniture without compressing flat in a few weeks. Denser felt lasts longer here, so look at density as well as thickness.
Wall Panels and Sound Dampening
Felt can reduce echo in a room. For decorative acoustic panels, 9mm to 12mm felt is common. Thicker and denser felt absorbs more sound, but thin decorative felt (1mm to 3mm) on a wall will do very little for acoustics on its own.
Does Fiber Type Change the Right Thickness?
Yes. The fiber in the felt changes how it feels at the same thickness. This matters because a 2mm acrylic sheet and a 2mm wool sheet can behave very differently.
Acrylic Felt Fabric
Acrylic felt fabric is the most common craft felt. It is affordable, comes in bright colors, and is widely available in 1mm to 3mm sheets. It is lighter and a bit stiffer than wool at the same thickness. The downside is that it can pill with heavy handling and it melts under high heat, so it is not a safe choice for trivets or anything near a hot surface.
For crafts, classroom projects, and decorations, it is a strong and budget-friendly option.
Polyester Felt
Polyester felt is similar to acrylic but often a little stronger and more resistant to stretching. Some polyester felt is made from recycled plastic bottles. It is common in 1mm to 3mm for crafts and in thicker forms for padding and acoustic panels.
Wool and Wool Blend Felt
Wool felt is softer, denser, and more durable than synthetic felt. It resists pilling, handles heat better, and holds stitches well. Many crafters say a 1mm wool sheet feels sturdier than a 1.5mm acrylic sheet because the fibers are packed more tightly. Wool blend felt (often mixed with rayon) gives some of these benefits at a lower price. Pure wool felt costs more, so it makes the most sense for heirloom toys, quality home decor, and heat-related uses.
Thickness vs Density: Why Two Sheets Can Feel Different
Thickness tells you how tall the sheet is. Density tells you how tightly the fibers are packed. Both affect strength and feel.
Low density felt is soft and fluffy. It compresses easily, tears more easily, and wears out faster. High density felt is firm and tight. It keeps clean edges when cut, resists stretching, and lasts longer under pressure.
This is why a cheap 3mm sheet may still feel weak while a good 2mm sheet feels solid. When comparing felt material from different sellers, look at the weight (GSM) along with the thickness. If two sheets are the same thickness, the heavier one is usually denser and stronger.
How to Test Felt Before You Buy
If you can order samples, test them before placing a large order. A few simple checks tell you a lot:
- Pinch and press. Squeeze the felt between two fingers. Good felt springs back. Weak felt stays flat.
- Pull gently. Stretch a corner in both directions. Felt that stretches or thins out quickly will not hold seams well.
- Cut a test shape. Clean edges mean dense fibers. Fuzzy or ragged edges mean lower density.
- Hold it up to light. Thin spots show up as lighter patches. Even felt has the same color all over.
- Sew or glue a sample. Use the same method you plan to use for your project and see how it holds.
Buying Wholesale Felt Fabric: Thickness Tips for Bulk Orders
If you run a craft business, teach classes, or make products to sell, buying wholesale felt fabric can cut your cost per sheet a lot. But bulk orders make thickness mistakes more expensive, so plan ahead.
First, always order a sample in the exact thickness and color before buying in bulk. Dye lots and batches can vary slightly, so ask the supplier if they can keep the order from one batch. Second, check whether the felt comes in sheets or rolls. Rolls are better for large cutting jobs and reduce waste, while sheets are easier for small projects and classroom kits. Third, ask about thickness tolerance. A good supplier will tell you how much a listed thickness can vary.
It also helps to standardize your thickness choices. Many small businesses stick to two thicknesses, such as 1mm for flat work and 2mm or 3mm for sewn or structured items. This keeps stock simple and makes reordering easier.
Common Mistakes When Choosing Felt Thickness
The most common mistake is picking felt by price alone. Cheap thin felt often costs more in the end because projects fall apart or need to be redone.
Another mistake is ignoring the tools you will use. Thick felt needs sharp blades and strong needles. If you plan to use a die cutting machine, check the machine's maximum material thickness before ordering. Many home cutting machines handle 1mm to 3mm felt well but struggle with anything thicker.
People also forget about heat. Acrylic and polyester felt should not be used for trivets, oven-related items, or anything touching hot surfaces. Use wool felt for these jobs.
Finally, do not assume all felt of the same thickness is the same quality. Density, fiber type, and how the felt is made all change the result.
Frequently Asked Questions
What is the most common felt thickness for crafts?
The most common thickness for craft felt is 1mm. It is easy to cut, works with glue, and is available in many colors. For sewing toys and ornaments, many crafters move up to 1.5mm or 2mm for better shape and strength.
Is 3mm felt good for sewing?
Yes, 3mm felt can be sewn by hand or on a home sewing machine with a heavy needle, such as a size 100/16 or a leather needle. Sew slowly and use a longer stitch length. Felt thicker than 3mm is often too much for most home machines.
Is thicker felt always better?
No. Thicker felt is stiffer and harder to cut and sew. For flat crafts, appliqué, and kids' projects, thin felt works better. Choose thickness based on what the finished item needs to do, not on the idea that thicker means higher quality.
Can I make thin felt thicker?
Yes. You can layer and glue two sheets together, or use fusible interfacing on the back to add stiffness. This works well for small items like ornaments. For large structured items, buying the right thickness from the start gives a cleaner result.
What felt thickness is best for coasters?
For coasters, 3mm to 5mm felt works best. It absorbs moisture, protects surfaces, and does not curl. Wool felt is the better choice if the coaster will hold hot mugs.
Find the Right Felt for Your Next Project
Choosing felt thickness comes down to knowing what your project needs. Thin felt bends and cuts easily. Medium felt holds stitches and shape. Thick felt protects, cushions, and stands up on its own. Check the fiber type and density along with thickness, and order samples before buying in bulk.
If you are looking for craft sheets, acrylic felt, or wholesale felt fabric in a full range of thicknesses and colors, Ice Fabrics offers options for crafters, teachers, retailers and businesses.
