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.

Calcolatori

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.

Inserisci i dati e seleziona Calcola.

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

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Materiali consigliati

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In qualità di Affiliato Amazon, riceviamo un guadagno dagli acquisti idonei.

Formula e metodo

Add seam allowances to rectangular pattern-piece dimensions. Calcola cosa ti serve, quanto te ne serve e cosa acquistare.

Ipotesi e limiti

Adds the allowance to both sides of each dimension.

Esempio pratico