Free calculator
Warp & Weft Calculator
Enter the finished size and the densities you intend to weave, and the calculator returns the ends, the picks, the warp length and the yarn mass — with the working shown.
Inputs
Value in cm
Value in cm
Value in epi
Value in ppi
Value in Nm
Value in cm
Result
—
Fit
How this works
- Warp length is the finished length grossed up for take-up and shrinkage, plus loom waste. Under-estimate the waste and the last thirty centimetres are unusable.
- Yarn mass uses the Nm count: a 8/1 Nm yarn is 8 metres per gram, so a 2 000 m warp needs about 250 g before allowance.
- Weft mass assumes the weft crosses the full warp width plus a small selvedge allowance on every pick.
Before you commit a warp
Every figure here is an estimate from published sett and count tables. Yarn varies between dye lots, spinners and fibres, so sample first. A sett that is too dense will abrade the warp and snap ends under tension; a sett that is too open will give a sleazy cloth that will not wear.
Loom waste and take-up are the two numbers people under-estimate most. Add 40–60 cm of waste on a small loom and 12 % or more for take-up.
Estimate only. These calculators model published behaviour so you can plan a warp with the working shown. They are not a guarantee of sett, shrinkage or quantity, and they do not replace sampling your own yarn on your own loom.
