QuiltMeasure

Quilt Border Yardage Calculator

Enter your quilt center and up to five borders to see each border's cut strip width, piece dimensions, strip and join counts, exact fabric requirement, and purchase amount — plus your quilt's final size after every border.

Measurements

Measurement system

Enter inches as a decimal or fraction, like 42, 42 1/2, 42-1/2, or 1/2. In centimeters, enter a decimal like 106.5.

Measure the actual, assembled quilt center through its middle, not a pattern's stated size.

Measure the actual, assembled quilt center through its middle, not a pattern's stated size.

Borders

Add up to five borders, applied from the inside out. Every border uses a fixed ¼ in (0.25 in) construction seam allowance. This is not adjustable.

Strip-to-strip join method

Diagonal joins are less visible but can introduce a slight wave in wider strips; straight joins are a more secure choice as strips widen. Both are fully calculated either way.

The cuttable width after removing selvage. Applied to every border in the sequence.

Purchase amount

Rounding always goes upward, so the recommended purchase amount never falls below the calculated requirement. Each border is rounded independently.

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Understanding the terms

How to measure your quilt center

Measure the actual, assembled quilt center through its middle — both width and length — rather than trusting a pattern's stated finished size. Outer edges stretch out of true during piecing, so a measurement taken near an edge can read wider or narrower than the quilt center actually is. After each border is added, base the next border's measurements on the quilt's new, as-sewn size rather than re-adding the pattern numbers by hand — this calculator already carries that updated size forward for you.

Finished width vs. cut strip width

Finished width is what you enter — how wide the border will look once it's sewn and pressed. Cut strip width is wider than that: it adds a seam allowance on both long edges of the strip, since fabric is consumed in the seam and never appears in the finished quilt. Every border uses a fixed ¼ in (0.25 in) construction seam allowance. This is not adjustable.

Why side borders are calculated first

This calculator attaches the two side borders before the top and bottom borders, matching common construction sequencing. That order matters for the numbers: the top and bottom pieces must span the quilt's new width, including both side-border ends, so their required length is longer than the quilt center's own width. Reversing the order would use the wrong piece lengths.

Straight vs. diagonal strip joins

When one width-of-fabric strip isn't long enough for a border, multiple strips are joined end-to-end. A diagonal join is less visually noticeable but consumes a little more length and, in wider strips, can introduce a slight wave along the seam. A straight join is more secure for wider strips but is a visible cross-seam. Both are fully supported and calculated — this calculator does not treat either one as the "correct" choice for every project; it computes whichever you select.

Crosswise-grain cutting

Border strips are cut across the fabric width (crosswise grain), which has enough give to ease smoothly around the quilt. This calculator does not compute lengthwise-grain or no-seam border cutting.

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About the results

What this calculator does

For each border you add, this calculator reports the cut strip width, the size and quantity of the side and top/bottom pieces, how many width-of-fabric strips to cut, how many strip-to-strip joins that requires, the exact fabric needed, a recommended purchase amount, and the quilt's size once that border is attached. It then reports your quilt's final size after every border in the sequence. Each border is treated as its own fabric with its own independent result — even when two borders happen to share the same cut width, this calculator never adds their fabric requirements together into one combined purchase figure.

Worked example

A 40 in × 40 in quilt center with one 3 in finished border, diagonal joins, and 42 in of usable fabric width:

Cut strip width
3.5 in (3 in finished + a ¼ in seam allowance on each edge)
Side pieces
2 pieces, 3.5 in × 40 in
Top/bottom pieces
2 pieces, 3.5 in × 46 in — the quilt is already 46 in wide once the side pieces are attached
Strips and joins
5 strips cut from the 42 in fabric width, with 4 diagonal joins between them
Fabric required
17.5 in, which rounds up to ½ yard at the nearest ⅛ yard
Quilt size after this border
46 in × 46 in

Common mistakes

  • Measuring a pattern's stated size instead of the actual, assembled quilt center.
  • Reusing the original quilt-center measurements for a second or third border instead of that border's own updated, pre-border size — this calculator carries the updated size forward automatically, so re-entering it by hand isn't necessary.
  • Cutting every strip before joining a sample length and checking it against the required length.
  • Not planning ahead for a directional print or one-way stripe — side and top/bottom pieces run in different directions around a butted-corner border, so a directional fabric will appear rotated 90° at each corner.
  • Not accounting for where a strip-to-strip join lands within the joined length — this calculator doesn't choose a seam's position, so plan your cuts if a join shouldn't sit near the center of a visible piece.

What this calculator doesn't cover

This calculator covers rectangular quilts with straight edges and up to five plain, straight borders with butted (not mitered) corners, cut across the fabric width.

It does not calculate mitered corners, lengthwise-grain or no-seam borders, cornerstones or corner blocks, pieced decorative borders, scalloped, curved, or asymmetric quilts, different border widths on different sides of the same border, or directional-print and motif matching.