Sew Measure

Sewing calculator

Cushion Cover Calculator

Plan envelope or zippered cover pieces, piping, layout, and material.

Your measurements

Use one unit for every dimension in this form.

Choose the back closure style.

Width of the cushion insert or finished cover.

Height of the cushion insert or finished cover.

Allowance around every sewn edge.

Total overlap between back panels.

Estimate piping around the finished perimeter.

Extra length used to join piping ends.

Usable fabric width.

Permit panels to rotate 90 degrees.

Keep all panels in the entered orientation.

Enter zero for a solid or non-matched fabric.

Optional percentage added before cutting waste.

Optional percentage for layout and cutting waste.

Cushion cover result

Cut pieces
2
Piping
Not included
Fabric to buy
0.625 yd
Cushion piecesA scaled planning diagram. Use the matching text result and cut list for exact dimensions.2 × Zippered panel
Cushion pieces. The drawing is scaled for comparison; written dimensions control.

Printable cut list

  • 2 × Zippered panel: 19.00 in × 19.00 in

Formula

Finished dimensions gain seam allowances; envelope backs split the width and share the entered overlap before layout.

Assumptions

  • The insert dimensions represent the desired finished cover.
  • Directional fabric prevents panel rotation.

When a tested commercial pattern gives different cutting dimensions or layout instructions, follow that pattern.

Worked example

  • 18 × 18 in cushion
  • 0.5 in seam allowance

The calculator returns labeled front and back pieces, optional piping, layout, and purchase quantity.

Verification note

Compare every cut piece with the insert and closure method before cutting decorative fabric.

Learn and verify