Seam Allowance Calculator

Add a seam allowance to a finished measurement to get the cut size, and work back from a cut size to the finished size it produces.

Finished width in

What you want the piece to measure once it is sewn.

Finished length in

Seam allowance in

5/8 in on a commercial pattern, 1/4 in for quilt piecing, 3/8 in for an overlocked seam.

How many edges take the allowance

Cut width you already have in

Fill this in to work backwards from a cut size. Leave at zero to use the finished width above.

Reset

Free calculator by Handcraft worked examples and methodology No account, nothing stored.