Weaving Warp Calculator
Work out how much warp a project needs: warp length with take-up and loom waste, the number of ends, and the yarn that takes — plus which reeds give the sett you want.
Reed substitution
| Reed (dents/in) | Ends per dent | Sett (ends/in) | Difference |
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Warp length per item is the finished length plus the take-up and shrinkage allowance: 24 in with a 12% allowance needs 26.88 in on the loom, and four of them plus 24 in of loom waste and fringe is 131.5 in, or 3.65 yd of warp. Ends in the warp are sett × width in the reed, rounded to a whole end: 20 ends/in across 20 in is 400 ends. Warp yarn is ends × total warp length, converted to yards and metres. The allowance is a single planning figure because take-up from interlacing and shrinkage in wet finishing vary with weave structure, yarn and finishing — sample if the length matters, and add any fringe you want on top of the waste. The reed table lists common reeds from 6 to 25 dents per inch with the closest whole number of ends per dent from 1 to 4, which is the usual way to sley to a sett you cannot get from one dent pattern alone. Everything runs locally in your browser with no storage, uploads or network access.