SewnCake Sewing Tool

Pouch Pattern Calculator

Choose the finished size you want. SewnCake will calculate the one-piece outer and lining dimensions for a French-seam boxy pouch — and show you a live proportion preview before you cut.

1. Finished pouch size

Units

Finished measurements

Length (in)

Width (in)

Height (in)

Seam allowance

Custom seam allowance (in)

Drafting method: one-piece outer + one-piece lining, with French seams. The zipper runs along the calculated pattern-piece Length.

Live preview

See the shape before you cut

Proportions only

Visual preview is approximate. Always use the calculated cutting measurements below.

2. Cutting measurements

Pattern piece length · zipper side

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Pattern piece width

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Outer fabricCut 1 · —

LiningCut 1 · —

InterfacingOptional · Cut 1 · —

Zipper—

Corner stitch line—

French-seam drafting formula used here: pattern length = finished length + finished height + 4 seam allowances. Pattern width = 2 × finished width + 2 × finished height + 2 seam allowances.

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