Description
Calculate equal button gaps after subtracting two placket-end margins.
Garment geometry distinguishes body and finished dimensions, elastic rest length, seamline/cutline offsets, motif phases and joining losses. A nominal coordinate or length budget does not establish material behavior or a suitable fit. Direction, angle units and the number of gaps rather than objects affect the result.
Calculate equal button gaps after subtracting two placket-end margins.
When to use this tool
Use Button Count and Placket End Margin Gaps when checking the stated garment length, allowance, repeat or material-record convention.
How to use the tool and how it works
- Enter placketLength, firstEndMargin, lastEndMargin, buttonCount. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read equalGap. Use the output convention below.
Require nonnegative placket/end margins with margin sum<=length and whole buttonCount>=2. Return (length-firstMargin-lastMargin)/(buttonCount-1).1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| placketLength | Placket Length | Required. Finite number; minimum 0. |
| firstEndMargin | First End Margin | Required. Finite number; minimum 0. |
| lastEndMargin | Last End Margin | Required. Finite number; minimum 0. |
| buttonCount | Whole count>=2; equal spacing divides by buttonCount-1 gaps. | Required. Safe integer; minimum 2. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| equalGap | Equal Gap | Required. Finite number. |
{
"input": {
"placketLength": 200,
"firstEndMargin": 20,
"lastEndMargin": 20,
"buttonCount": 5
},
"output": {
"equalGap": 40
}
}Limitations and assumptions
- Equal spacing includes both endpoint button positions; no minimum gap, garment fit or production tolerance is selected.
- 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
Use measured pattern/material properties, fitting evidence and appropriate complete production methods for actual garment fit and construction.
References
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