Pillow Cover Size Calculator
Get exact cutting dimensions for any pillow insert size and closure style.
Results are estimates. Always add extra for shrinkage, mistakes, and pattern matching.
How to Use the Pillow Cover Size Calculator
Select your pillow insert size from the dropdown or enter a custom size. Choose your preferred seam allowance. The calculator will show cutting dimensions for three closure types:
- Envelope Closure: Two overlapping back pieces — no zipper needed. Quick and easy to remove for washing.
- Zippered Cover: Clean finish with an invisible zipper. Front and back panels cut to the same size with zipper allowance built in.
- Simple Sewn: Two identical panels sewn together. Stuff the insert then hand-stitch or slip-stitch to close.
Common Pillow Insert Sizes Reference
| Insert Size | Front Cut | Env. Back (each) | Zip Front/Back |
|---|---|---|---|
| 14" sq | 15" × 15" | 15" × 10.5" | 15" × 15" |
| 16" sq | 17" × 17" | 17" × 11.5" | 17" × 17" |
| 18" sq | 19" × 19" | 19" × 12.5" | 19" × 19" |
| 20" sq | 21" × 21" | 21" × 13.5" | 21" × 21" |
| 22" sq | 23" × 23" | 23" × 14.5" | 23" × 23" |
| 24" sq | 25" × 25" | 25" × 15.5" | 25" × 25" |
Note: Sizes above use ½" seam allowance. Adjust per your chosen seam allowance.