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Rectangular Pattern Seam Allowance
Online rectangular pattern seam allowance. Planning estimate using the supplied gauge, fabric dimensions and allowances; stretch, drape and finishing losses require separate assessment.
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rectangular pattern seam allowance calculator online
Use rectangular pattern seam allowance online for finished width cm, finished height cm, allowance cm. Planning estimate using the supplied gauge, fabric dimensions and allowances; stretch, drape and finishing losses require separate assessment.
How to use it
Enter finished width cm. Set finished height cm, allowance cm. Select Calculate and check the labeled output. Copy or download the JSON result.
Options and example settings
Calculation method
cut_width_cm = finished_width_cm+2*allowance_cm; cut_height_cm = finished_height_cm+2*allowance_cm (^ means exponentiation; trig functions ending in d use degrees).
Worked examples
Apply rectangular pattern seam allowance to the case below, keeping the displayed units and assumptions. Planning estimate using the supplied gauge, fabric dimensions and allowances; stretch, drape and finishing losses require separate assessment.
Rectangular Pattern Seam Allowance — worked case
Settings: finished height cm: 30; allowance cm: 1.5
Input:
40
Calculated result for these inputs:
Output:
{
"cut_width_cm": 43,
"cut_height_cm": 33
}Choose the right tool
Use your measured gauge and actual fabric dimensions. Distinguish finished measurements from cut measurements with seam allowances, and verify pattern-repeat and shrinkage assumptions before cutting.
Limitations and common mistakes
- Planning estimate using the supplied gauge, fabric dimensions and allowances; stretch, drape and finishing losses require separate assessment.
- Use the displayed unit in every field. Ratios and percentages are different inputs; percent fields use values such as 25 rather than 0.25.
Frequently asked questions
How can I use rectangular pattern seam allowance calculator online?
Enter finished width cm. Set finished height cm, allowance cm. Select Calculate and check the labeled output. Copy or download the JSON result.
Where is my input processed?
The bundled tool processes input in your browser. It does not upload tool input to a conversion service. Other site plugins, analytics, advertising and browser extensions may have separate behavior.
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