THE NUMBERS, EXPLAINED
How to use this calculator.
Take-up and shrinkage are successive length losses, so each is reversed by division. Sample allowance is already measured as warp length; loom waste and sample are added once per end. Use measured percentages for your yarn and structure.
Start with your inputs
Enter finished cloth length (cm), loom waste (cm), take-up as percentage of loom length (%), wet-finish shrinkage (%), additional sample warp (cm), warp ends. Keep amounts in the units shown on each field. The example is a starting point, not a recommended value.
| Input | Example value |
|---|---|
| Finished cloth length (cm) | 200 |
| Loom waste (cm) | 50 |
| Take-up as percentage of loom length (%) | 10 |
| Wet-finish shrinkage (%) | 10 |
| Additional sample warp (cm) | 20 |
| Warp ends | 100 |
A worked example
With the example inputs above, warp length per end (m) is 3.169136. Change the inputs to explore your own scenario.
| Result | Example answer |
|---|---|
| Warp length per end (m) | 3.169136 |
| Total warp (m) | 316.91358 |
How this is calculated
Warp length per end (m)
Finished length ÷ (1−take-up/100) ÷ (1−shrinkage/100), then add loom waste and sample allowance; divide by 100.
Total warp (m)
Warp length per end × number of ends.
Symbols and units
- a
- Finished cloth length (cm)
- b
- Loom waste (cm)
- c
- Take-up as percentage of loom length (%)
- d
- Wet-finish shrinkage (%)
- e
- Additional sample warp (cm)
- f
- Warp ends
Use the units shown. A list keeps the order in which you enter its values. The symbol ^ means “raised to the power of”.
Assumptions and limits
Take-up and shrinkage are successive length losses, so each is reversed by division. Sample allowance is already measured as warp length; loom waste and sample are added once per end. Use measured percentages for your yarn and structure.
Calculations use the values you enter. Blank or invalid inputs show an error instead of silently substituting zero. Results are displayed to useful precision; calculations retain the underlying numeric precision.
Questions about this tool
What does the result tell me?
Warp length per end (m); Total warp (m). The result applies to the method and inputs described above. Check the units and assumptions before using it in a decision.
Why might another calculator differ?
Differences in units, rounding, timing or model definitions can produce different answers. Compare the input definitions and the method, rather than only the final number. For this tool: Take-up and shrinkage are successive length losses, so each is reversed by division. Sample allowance is already measured as warp length; loom waste and sample are added once per end. Use measured percentages for your yarn and structure.
Are my inputs stored or sent to AI?
Calculations on this page happen in your browser. The separate AI question finder sends its submitted conversation to OpenAI; these calculator fields are not sent. Favourites and recent tool names are stored locally. A shared link contains the inputs you choose to include.
Further reading
Ashford: measured shrinkage in woven cloth ↗
Background reading; this does not imply endorsement or independent review of SumFizz.
Review status
Software example and browser checks are recorded in our quality report. No external expert review is claimed. Created with coding assistance; calculations run as ordinary browser code.
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