Why calculate pattern piece area?

Knowing the total area of your pattern pieces helps estimate fabric usage. Compare the total pattern area to the available fabric area to check if you have enough fabric and plan efficient layouts.

How do I estimate irregular pattern piece areas?

Break irregular shapes into simpler shapes (rectangles, triangles, circles). Calculate each part and add them together. Alternatively, trace the piece on graph paper and count the squares.

What about fabric waste?

Pattern pieces never nest perfectly on fabric. Expect 15-25% waste depending on piece shapes and fabric width. Directional fabrics and pattern matching increase waste to 25-40%.

How do I plan an efficient layout?

Group pattern pieces by grain line direction. Place large pieces first, then fill gaps with smaller pieces. Fold fabric right sides together for cutting pairs. Use the full fabric width and alternate piece directions to minimise gaps.

SewCalcs

Pattern Piece Area Calculator — Fabric Layout Planning

Estimate the area of pattern pieces for fabric layout planning.

Shape

Width

Height

Number of Copies

How many to cut

How We Calculate This

Pattern piece area is calculated from the shape dimensions. The total area includes all copies (for cut-2-of-this-piece scenarios).

The formulas

Rectangle: Width × Height

Triangle: Base × Height ÷ 2

Circle: π × Radius²

Trapezoid: (Top + Bottom) ÷ 2 × Height

Frequently Asked Questions

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Last updated: February 2026

All calculations are estimates. Always verify quantities before cutting or purchasing fabric.