Cutfit

Fabric with seam allowance

Use finished piece measurements and add a seam allowance to each edge before planning.

Your measurements

Decimals and fractions such as 1.5, 1½ or 1 1/2 are accepted. Do not use thousands separators.

For cut-on-fold pieces, enter the half-pattern width. The folded edge receives no seam allowance.

Example calculation

Fabric with seam allowance: worked out from the values already filled in the form above.

Inputs

Result

How the calculation works

The allowance is per edge, not a single addition to the whole piece. A finished 450 × 450 mm square with 10 mm seams becomes a 470 × 470 mm cutting rectangle. For ordinary pieces, both width and height grow by twice the allowance.

Do not add the allowance twice. If your supplied pattern dimensions already include seams, enter zero here. The fold edge is handled separately on a cut-on-fold piece; the other cut edges still receive the selected allowance.

Related tools

01

Fabric yardage calculator

Lay out rectangular pieces across your fabric width, with grain direction and seam allowance.

02

Compare fabric widths

Change the usable fabric width and compare the length needed for the same pieces.

03

Folded fabric planning

Compare single-layer and folded cutting. Keep the grain and cut-on-fold requirements explicit.