How it works
At finished width b and seam s, strip cut width = b + 2s; side cut length = current quilt H + 2s; top/bottom cut length = current quilt W + 2b + 2s.
— BORDERS / FREE ONLINE TOOL
Quilt border calculator: layers that fit.
Build up to five consecutive border layers, with side pieces first and top/bottom pieces second. Each layer has its own fabric width and cut diagram.
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Plan it once.Cut it with confidence ✳
● YOUR CUTTING PLANLOCAL CALCULATION · V2
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DEFAULT EXAMPLE
A 60 × 80 in quilt plus one 3 in border becomes 66 × 86 in. With ¼ in seam, side cut length is 80½ in; top/bottom cut length is 66½ in.
✳ Verifiable cut layout⊞ No cloud upload↔ Real fabric width✓ Print-friendly
— UNDER THE STITCHES
Clear math. Better cuts.
Understand the calculation before cutting into fabric.
From measurements to fabric
Use the current finished quilt width and length, and choose each layer width. The next layer starts from the dimensions after the previous layer is attached.
What it does not assume
Only unpieced, butted borders are implemented. Mitered corners and pieced border joints are not assigned invented yardage.
— THE WORKED EXAMPLE
Start with something familiar.
A 60 × 80 in quilt plus one 3 in border becomes 66 × 86 in. With ¼ in seam, side cut length is 80½ in; top/bottom cut length is 66½ in.
— PRACTICAL MEASUREMENT GUIDE
How to size side-first, butted quilt borders
Border strips have a finished visible width and a larger cut width that includes seam allowance. The order of sewing matters: this calculator models side borders first, then top and bottom borders.
A 3-inch border on a 60 × 80 inch quilt
With a ¼-inch seam allowance, a 3-inch finished border needs a 3½-inch cut width. The two side pieces are each 80½ inches long. After the sides are attached, the quilt width grows from 60 to 66 inches; the top and bottom pieces must each be 66½ inches long.
The final outside dimensions are 66 × 86 inches. For a second border layer, repeat the calculation using those new dimensions—not the original 60 × 80 inch center.
Why an impossible long strip is flagged
The model specifies continuous, unpieced, lengthwise-grain strips and a measured usable bolt width. Each layer gets its own physical layout and fabric SKU. A single piece that is too wide for the fabric roll is rejected rather than replaced by an invented pieced construction.
Mitered corners, patterned border matching and WOF strip splicing require different cutting rules. Keep those methods outside this result unless you have validated instructions.
— COMMON QUESTIONS
A little clarity goes a long way.
Are mitered borders included?
No, the tool models side-first butted construction.
Are cut lengths different from finished lengths?
Yes. Every cut length includes the specified seam allowance.
Can I add more colors?
Yes, give each layer its own SKU and fabric width.