Weft yarn calculator
Estimate weft from on-loom length, reed width, pick density, and extra yarn per pick.
Enter your measurements
Example values are loaded. Change them to your measurements, then calculate.
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 methodologyWorked 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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