How accurate is this result?

It is a practical planning estimate based on the visible assumptions. Product specifications and real-world conditions can vary.

Can I change the assumptions?

All editable assumptions appear as calculator inputs. Fixed assumptions are listed on the page.

Calculadoras

Seam Allowance Calculator

Add seam allowances to rectangular pattern-piece dimensions.

Answer with the example values

Cut Length: 63 · Cut Width: 43

Formula: Add seam allowances to rectangular pattern-piece dimensions. The method uses the entered values in consistent units and rounds only the final purchase quantity.

Assumptions: Adds the allowance to both sides of each dimension.

Introduza os dados e selecione calcular.

Your answer and the practical quantities behind it will appear here.

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Fórmula e método

Add seam allowances to rectangular pattern-piece dimensions. Calcule o que precisa, quanto precisa e o que comprar.

Pressupostos e limitações

Adds the allowance to both sides of each dimension.

Exemplo prático