Seam Allowance Reference Chart
A practical reference for seam allowance reference chart with context for choosing a starting value rather than treating conventions as fixed rules.
How to use this chart
Find the row closest to your material or intended size, then confirm it against the pattern, manufacturer guidance or a measured sample. Keep units consistent.
| Allowance | Metric | Typical context |
|---|---|---|
| ¼ in | 6 mm | Quilting seams |
| ⅜ in | 10 mm | Some patterns |
| ½ in | 12–13 mm | Craft and garment work |
| â… in | 16 mm | Many commercial patterns |
Useful context
Published conventions differ by region, manufacturer and intended ease. Use the table as a starting reference and record the actual result from your own material.