Warp and weft calculator
Calculate warp and weft yarn for a weaving project
Use the main weaving calculator to estimate warp length, total warp ends, warp yardage, weft yardage, skeins or cones, and cost. This page explains the warp and weft pieces separately so the numbers are easier to trust.
Start with the live calculator
The full project calculator includes saved loom profiles, metric and imperial units, a formula panel, warnings, and a printable project card.
Warp yarn inputs
Warp yarn depends on the width in the reed, sett, number of ends, woven length, take-up, shrinkage, sampling, fringe, and loom waste. The highest-risk beginner mistake is forgetting loom waste or multiplying by finished length instead of the full warp length.
| Input | Why it matters |
|---|---|
| Sett / EPI | Determines how many warp ends are needed across the width. |
| Loom waste | Adds length that cannot become finished cloth. |
| Sampling | Adds test length before the main project. |
| Fringe | Adds extra warp at one or both ends. |
Weft yarn inputs
Weft yarn depends on width, woven length, picks per inch, and weft take-up. Weft estimates are less exact than warp estimates because beat, shuttle angle, structure, and selvedges can change yarn use.
Warp and weft FAQ
Is warp yardage more predictable than weft yardage?
Usually yes. Warp yardage is mostly ends times warp length. Weft yardage changes more with beat, structure, and weaving habits.
Should I combine warp and weft totals?
Only combine them when the same yarn is used for both. If warp and weft yarns differ, keep package counts separate.