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.

Calculators

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.

Vul je gegevens in en kies Berekenen.

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

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Formule en methode

Add seam allowances to rectangular pattern-piece dimensions. Bereken wat je nodig hebt, hoeveel je nodig hebt en wat je moet kopen.

Aannames en beperkingen

Adds the allowance to both sides of each dimension.

Rekenvoorbeeld