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Quilt Fabric Cutting Calculator

Work out quilt fabric cutting instantly with clear inputs, formula shown and shareable results.

About Quilt Fabric Cutting Calculator

Block counts round up in each direction, and each block is cut at the finished size plus twice the seam allowance so the seams consume the extra. Seam allowance is added on both sides of every block, so a 15 cm finished block cut at 16.5 cm loses 1.5 cm to the two seams that join it.

Formulas

Block grid

columns = ceiling(quilt width / block size); rows = ceiling(quilt length / block size)

Cut size

cut = finished block size + 2 x seam allowance

Worked example

With the default values below, Quilt Fabric Cutting Calculator returns Blocks needed of 224. Change any input above and every figure here is recalculated in your browser.

Inputs used

Finished quilt widthminimum 1 cm
200 cm
Finished quilt lengthminimum 1 cm
240 cm
Finished block sizeminimum 0.5 cm
15 cm
Seam allowanceminimum 0 cm
0.75 cm

Results

Blocks needed
224
Cut size per block
16.50 cm
Block grid
14 across x 16 down
Fabric area required
6.098 m2

Step by step

  1. 1Values used
  2. 2Block grid
  3. 3Cut size
  4. 4Blocks needed= 224
  5. 5Cut size per block= 16.50 cm
  6. 6Block grid= 14 across x 16 down
  7. 7Fabric area required= 6.098 m2

Assumptions and limits

  • The result is derived only from the 4 inputs listed above. Anything not among them is not part of the calculation.
  • In particular, this calculator does not take inflation, tax, fees or charges or compounding frequency into account.
  • Figures are rounded for display to 3 decimal places, so totals built from several rounded parts can differ slightly from the unrounded arithmetic.

How these calculators are built and tested is described on the Methodology page. If a figure looks wrong, please report it.

Frequently Asked Questions

How is the Quilt Fabric Cutting figure worked out?

columns = ceiling(quilt width / block size); rows = ceiling(quilt length / block size). Block counts round up in each direction, and each block is cut at the finished size plus twice the seam allowance so the seams consume the extra.

Why does this matter?

Seam allowance is added on both sides of every block, so a 15 cm finished block cut at 16.5 cm loses 1.5 cm to the two seams that join it.

What do I need to enter?

Enter finished quilt width, finished quilt length, finished block size, seam allowance. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.

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