Quilt border calculator

Calculate one straight border, with the side pieces attached first. The top and bottom pieces then span the widened center.

Quilt Border Calculator

Measurements

Border layout

Edit measurementsAwaiting calculation

Enter your measurements

Calculate to draw your layout.

Browser-only draft. Export or print to keep a copy.

Use the center measurement the model expects

Enter finished center dimensions between intended outer seam lines. The raw center includes an outside allowance. Measure and square the actual work before cutting.

The sides-first construction

For center W × H, border B and seam S: strip width = B + 2S; side length = H + 2S; top/bottom length = W + 2B + 2S.

A 50 × 60 center, 3-inch border and ¼-inch seams need 3½-inch strips: two at 60½ inches, two at 56½. Finished size: 56 × 66.

Long pieces may need joining

Each straight join consumes 2S. Two 42-inch strips with ¼-inch seams yield 83½ inches. Each example border needs two strips: eight total, using 28 fabric inches, rounded to 1 yard.

Offcuts are not reused between borders. No mitered corners or cornerstones are modeled.

Carry the new dimensions into the next step

Calculate extra borders in sewing order. Take final dimensions to binding, backing and batting. Use the block calculator for the center.

Last reviewed 2026-10-25.

Questions about this calculation

Can I attach the top and bottom borders first?

This cutting plan assumes sides first. A different order changes which pieces span the corners, so do not interchange the lengths without recalculating that construction.

Does the yardage reuse all the offcuts?

No. Each border piece is planned separately from crosswise strips. The result may leave reusable fabric, but it is not a minimum-waste cutting optimization.

Does it calculate a mitered border?

No. It models straight butt corners with an equal finished border width on all four sides.