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Sewing Fabric Requirement Calculator

Work out sewing fabric requirement instantly with clear inputs, formula shown and shareable results.

About Sewing Fabric Requirement Calculator

The number of pieces fitting across the fabric width sets how many rows are needed, and the fabric length is those rows times the piece length. Because pieces per width is a whole number, a piece just over half the fabric width wastes almost half the cloth, which is why nesting the layout matters.

Formulas

Pieces across

per row = floor(fabric width / piece width)

Fabric length

length = ceiling(pieces / per row) x piece length

Worked example

With the default values below, Sewing Fabric Requirement Calculator returns Fabric length needed of 120.0. Change any input above and every figure here is recalculated in your browser.

Inputs used

Number of pattern piecesminimum 1
4
Length of one pieceminimum 1 cm
60 cm
Width of one pieceminimum 1 cm
50 cm
Usable fabric widthminimum 1 cm
140 cm

Results

Fabric length needed
120.0 cm
Fabric in metres
1.200 m
Pieces that fit across the width
2
Fabric wasted
28.57%

Step by step

  1. 1Values used
  2. 2Pieces across
  3. 3Fabric length
  4. 4Fabric length needed= 120.0 cm
  5. 5Fabric in metres= 1.200 m
  6. 6Pieces that fit across the width= 2
  7. 7Fabric wasted= 28.57

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 Sewing Fabric Requirement figure worked out?

per row = floor(fabric width / piece width). The number of pieces fitting across the fabric width sets how many rows are needed, and the fabric length is those rows times the piece length.

Why does this matter?

Because pieces per width is a whole number, a piece just over half the fabric width wastes almost half the cloth, which is why nesting the layout matters.

What do I need to enter?

Enter number of pattern pieces, length of one piece, width of one piece, usable fabric width. The defaults shown are a realistic worked example — swap in your own figures to get a result you can use.

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