Weaving Warp Length Calculator
Weaving shortens the warp as the weft packs it in — takeup, commonly 10–15% for plain weave. Add fringe length at both ends, plus the loom waste used for tying on (typically 30–50 cm), to get the actual length to cut.
Your numbers
Warp length needed
172cm
Formula
Warp length needed = Finished length × (1 + Takeup ÷ 100) + 2 × Fringe per end + Loom waste
Takeup depends on weft thickness and how hard you beat it in. A short test weave with a new yarn gives you a measured takeup rate that saves warp on the next project.
What to enter
| Input | Default | Accepted range |
|---|---|---|
| Finished length (cm) | 100 | 1 and up |
| Takeup (%)How much the weft packing shortens the warp; twill and satin weaves take up more than plain weave. | 12 | 5 ~ 25 |
| Fringe per end (cm) | 10 | 0 and up |
| Loom waste (cm)The length lost at both ends tying the warp onto the loom, unusable in the finished piece. | 40 | 0 and up |
Step by step
Quick reference table
Results when only Finished length (cm) changes and everything else stays put.
| Finished length (cm) | Warp length needed (cm) |
|---|---|
| 50 | 116 |
| 75 | 144 |
| 100 | 172 |
| 150 | 228 |
| 200 | 284 |
What each result means
| Result | At default values |
|---|---|
| Warp length needed (cm) | 172 |
Common mistakes
Takeup depends on weft thickness and how hard you beat it in. A short test weave with a new yarn gives you a measured takeup rate that saves warp on the next project.
Glossary
- Takeup
- How much the weft packing shortens the warp; twill and satin weaves take up more than plain weave.
- Loom waste
- The length lost at both ends tying the warp onto the loom, unusable in the finished piece.
Frequently asked questions
QHow is Weaving Warp Length Calculator calculated?
Warp length needed = Finished length × (1 + Takeup ÷ 100) + 2 × Fringe per end + Loom waste — Weaving shortens the warp as the weft packs it in — takeup, commonly 10–15% for plain weave. Add fringe length at both ends, plus the loom waste used for tying on (typically 30–50 cm), to get the actual length to cut.
QCan you walk through an example?
With Finished length 100cm, Takeup 12%, Fringe per end 10cm, Loom waste 40cm, the answer is Warp length needed 172cm.
QWhat do I need to enter?
Enter Finished length, Takeup, Fringe per end, Loom waste. The result recalculates as you type, and an empty box counts as zero.
QHow much does the answer move if I change a number?
Changing only Finished length (cm) moves the answer to Finished length (cm) 50 → Warp length needed (cm) 116 and Finished length (cm) 200 → Warp length needed (cm) 284. The table below lays out five steps.
QHow are the numbers rounded?
Money is shown to the nearest whole unit, percentages to one decimal place and everything else to two. What you see is rounded; the calculation itself carries the unrounded value forward.
QAnything to watch out for?
Takeup depends on weft thickness and how hard you beat it in. A short test weave with a new yarn gives you a measured takeup rate that saves warp on the next project.
Related calculators
Materials differ in density and absorption. If your label states a figure, use it — the defaults here are only common values.