Fabric Shrinkage and Prewashing Guide
Cotton shrinks the first time it is washed, and that shrinkage can throw off a carefully planned quilt. Understanding how much to expect helps you decide whether to prewash and how much extra fabric to buy.
How Much Does Cotton Shrink?
Most quilting cotton shrinks 1 to 3 percent, and up to 5 percent on the first hot wash. That means a 44 inch wide fabric can lose about 1 to 2 inches of usable width after washing, which matters when you are cutting strips WOF.
To Prewash or Not
Prewash if you want the finished quilt to be machine washable without surprise shrinkage, or if you are mixing fabrics with different care needs. Skip prewashing for a crisper handle and when using precuts, which fray badly if washed.
Planning for Shrinkage
If you do not prewash, add about 1/4 to 1/2 inch to each cut dimension or buy roughly 10 percent extra yardage so the finished quilt still meets its planned size after the first wash.
Shrinkage at a Glance
| Fabric width | After 3% shrink | After 5% shrink |
|---|---|---|
| 44" bolt | ~42.7" | ~41.8" |
| 42" usable | ~40.7" | ~39.9" |
| 10 yd yardage | ~9.7 yd | ~9.5 yd |
Frequently Asked Questions
How much does quilting cotton shrink?
Most quilting cotton shrinks 1 to 3 percent, and up to 5 percent on the first hot wash. That means a 44 inch wide fabric can lose about 1 to 2 inches of usable width after washing.
Should I prewash fabric before quilting?
Prewash if you want the finished quilt to be machine washable without surprise shrinkage, or if you are mixing fabrics with different care needs. Skip prewashing for a crisper handle and when using precuts.
How does shrinkage change yardage planning?
If you do not prewash, add about 1/4 to 1/2 inch to each cut dimension or buy roughly 10 percent extra yardage so the finished quilt still meets its planned size after the first wash.
How do I prewash without fraying?
Use a delicate cycle with cold water, add a color catcher for dark fabrics, and either serge the cut edges or wash pieces inside a mesh laundry bag to limit fraying.