Description
Subtract allowance at both sides of each dimension and multiply net dimensions.
Pattern-area estimates simplify pieces into stated geometric models. Seam strips and area-to-length conversions can support planning, but do not prove that a practical cutting layout or finished construction exists.
Subtract allowance at both sides of each dimension and multiply net dimensions.
When to use this tool
Use Pocket Bag Seam Net Area when you need the stated pattern-area or material-budget term.
How to use the tool and how it works
- Enter width, height, seamAllowance. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read netWidth, netHeight, netArea. Use the output convention below.
Require nonnegative seam allowance and dimensions at least twice it. Subtract allowance at both sides of each dimension and multiply net dimensions.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| width | Width or interval span on the measurement basis above. | Required. Finite number. |
| height | Height in the common length unit and direction stated above. | Required. Finite number. |
| seamAllowance | Seam Allowance | Required. Finite number; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| netWidth | Net Width | Required. Finite number. |
| netHeight | Net Height | Required. Finite number. |
| netArea | Net Area | Required. Finite number. |
{
"input": {
"width": 20,
"height": 25,
"seamAllowance": 1
},
"output": {
"netWidth": 18,
"netHeight": 23,
"netArea": 414
}
}Limitations and assumptions
- The model is rectangular and can yield zero area. Rounded corners, gussets, openings, turn-of-cloth and actual pocket capacity are not included.
- 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 a complete cutting layout and construction sample for production planning. Include grain direction, curved edges, joins, waste and fabric behavior beyond the simplified area model.
References
Similar or alternative tools
- Skirt Circle Panel Seam Allowance
Return 2×panels×radialLength×seamAllowance.
- Bias Strip Length From Square Area
Divide remaining area by stripWidth for length.