Description
Return cutWidth-2×seamAllowance-firstFold-secondFold.
A pattern's seam and closure dimensions combine finished lengths with allowances, overlaps and offsets. A local length budget describes an ideal construction; fabric thickness, movement and fitting can change the practical result.
Return cutWidth-2×seamAllowance-firstFold-secondFold.
When to use this tool
Use Placket Fold Back Width Budget when you need a local pattern, seam or closure dimension check.
How to use the tool and how it works
- Enter cutWidth, seamAllowance, firstFold, secondFold. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read visibleWidth. Use the output convention below.
Require nonnegative cut width, seam allowance and both folds. Return cutWidth-2×seamAllowance-firstFold-secondFold.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| cutWidth | Cut Width | Required. Finite number; minimum 0. |
| seamAllowance | Seam Allowance | Required. Finite number; minimum 0. |
| firstFold | First Fold | Required. Finite number; minimum 0. |
| secondFold | Second Fold | Required. Finite number; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| visibleWidth | Visible Width | Required. Finite number. |
{
"input": {
"cutWidth": 10,
"seamAllowance": 1,
"firstFold": 2,
"secondFold": 2
},
"output": {
"visibleWidth": 4
}
}Limitations and assumptions
- A negative visible width is retained as an infeasibility diagnostic. Thickness, fold sequence, overlap and complete placket construction are not modeled.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Check the complete pattern and make an appropriate sample in the intended material. Review seam construction, allowances, shrinkage and fitting rather than treating one margin as complete garment validation.
References
Similar or alternative tools
- Waistband Closure Overlap Balance
Add waist+seamEnds+overlap+signed ease and subtract from cut length.
- Trouser Hem Cuff Turnup Budget
Return finished+2×cuffDepth+hemAllowance and the allowance total.