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Weft yarn calculator

Estimate weft from on-loom length, reed width, pick density, and extra yarn per pick.

Free · no account

Enter your measurements

in · Include sampling; exclude open fringe and waste.
in · Use the actual rounded body width.
PPI · Use a measured sample when possible.
% · Yarn beyond a straight reed-width pass.

Your result

How the calculation works

weft yards = on-loom cloth length × PPI × reed width × (1 + path allowance) ÷ 36

The rectangular estimate does not model selvedge loops or variable beat precisely. Reed width can be wider than cloth at the fell, so treat the result as a planning approximation. Do not count unwoven gaps as cloth.

Full calculation methodology

Worked example

100 in of cloth at 20 PPI and a 20 in reed width, with 10% extra path, uses about 1,222.22 yd.

Use the complete weaving planner to connect the dimensions, allowances, and yarn quantities for one project.

Reference: Planning references and independent arithmetic. Calculations run locally.

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