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.

Calculateurs

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.

Saisissez vos mesures puis lancez le calcul.

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

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Fournitures recommandées

Fabric scissors

Rotary cutter and mat

Sewing measuring tape

En tant que Partenaire Amazon, nous réalisons un bénéfice sur les achats remplissant les conditions requises.

Formule et méthode

Add seam allowances to rectangular pattern-piece dimensions. Calculez ce qu’il vous faut, en quelle quantité et quoi acheter.

Hypothèses et limites

Adds the allowance to both sides of each dimension.

Exemple pratique