ToolNestFree Quilt Binding Calculator
Last updated: October 26, 2026
Quick answer: Binding is the last step of a quilt — and the one where running short hurts most, because a half-finished edge cannot wait for a fabric order. This free quilt binding calculator works out the whole job before you cut: your quilt's perimeter, the binding length including the joining allowance, how many strips to cut from your fabric width, and the yardage to buy rounded up the way shops cut it. It handles straight-grain binding for straight-edged quilts and bias binding for curves and scallops, at any strip width. Everything runs in your browser; no signup, no app.
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Worked example: a 60 x 80-inch quilt has a perimeter of 2 x (60 + 80) = 280 inches. Add the 12-inch joining allowance for 292 inches of binding. At a 42-inch usable fabric width that is 292 / 42 = 6.95, rounded up to 7 strips. Seven strips at 2.5 inches wide use 17.5 inches of fabric, which is 17.5 / 36 = 0.49 yards, rounded up to the nearest 1/8 yard = 1/2 yard to buy. Quilting cotton is usually 42–44 inches off the bolt and about 40–42 inches usable once the selvages are trimmed — measure your fabric, do not trust the bolt label.
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How to Use the Quilt Binding Calculator
- Measure your quilt's width and height in inches through the center, not along the edges: quilt edges wave and stretch, so a center measurement is what quilters use for borders and binding, and it is the number this calculator trusts. Enter both numbers in inches.
- Pick your binding style: straight-grain for any quilt with straight edges (the usual case — strips cut parallel to the selvage, stable and easy to sew), or bias for curves, scallops, or a round quilt (strips cut at 45 degrees, so they stretch around a curve instead of puckering). Bias binding takes about 41% more length for the same quilt, and the calculator applies that factor for you.
- Set the strip cut width: 2.5 inches is the standard for double-fold binding, which finishes at about 3/8 to 1/2 inch showing on the front. Go 2.25 inches for a narrower, more delicate edge, 2.75 inches for a chunkier, more visible one, or 1.25 to 1.5 inches for single-fold binding on table runners and lightweight projects.
- Set the usable fabric width: quilting cotton is usually 42 to 44 inches off the bolt, but about 40 to 42 inches once the selvages are trimmed off — and the selvages are not usable binding. The default here is 42 inches; if your fabric measures 40 usable inches, enter 40, because one wrong inch here changes the strip count.
- Set the joining allowance: 12 inches is the standard, covering both the diagonal seams that join strips end to end and the final loop-closing join (10 inches is the bare minimum most quilters accept). Raise it if your binding fabric has a directional print or a large motif — matching the pattern across joins eats length.
- Press Calculate binding and read four numbers: perimeter, binding length (perimeter plus allowance, bias-adjusted when bias is selected), strips to cut, and fabric to buy in inches and in yards, rounded up to the nearest 1/8 yard the way shops cut. The cut line underneath says exactly what to cut — for example, 'Cut 7 strips at 2.5 in wide' — and Copy cut list takes it to your notes.
Why Use Our Quilt Binding Calculator?
- Straight-grain and bias in one page — most shop calculators assume straight grain only. Bias binding needs the 1.414 diagonal factor (a 292-inch quilt edge becomes about 413 inches of bias binding), and this page applies it instead of leaving you to remember it.
- Strip width and fabric width both editable — the two numbers other calculators lock at 2.5 inches and 42 inches. Your quilt, your fabric, your numbers: a 2.25-inch strip or a 40-inch usable width changes the answer, and this page follows.
- Joining allowance out in the open — the 12 inches for seams and the final join are shown as their own input, not buried in the math. Lower it to 10 if you sew tight joins, raise it for pattern matching, and watch the strip count move.
- A plain cut list, not a bare decimal — the result says 'Cut 7 strips at 2.5 in wide' and the yardage beside it, so you can walk into the cutting step without re-deriving anything from a number.
- Shop-style yardage rounding — fabric is bought in 1/8-yard increments, so the yardage rounds UP to the next 1/8 yard (17.5 inches becomes 1/2 yard, not 0.49). Rounding down is how a quilter ends up one strip short.
- Finished-width guidance built in — the strip width you pick maps to the edge you see: 2.25 inches finishes narrow, 2.5 inches is the standard 3/8-to-1/2-inch face, 2.75 inches reads chunky. Pick the look first, then let the calculator handle the length.
Common Use Cases
- A baby quilt, 36 x 48 inches, standard 2.5-inch double-fold binding: Perimeter 2 x (36 + 48) = 168 inches, plus 12 inches allowance = 180 inches. At 42 inches usable width that is 180 / 42 = 4.29, rounded up to 5 strips. Five strips at 2.5 inches use 12.5 inches of fabric — 12.5 / 36 = 0.35 yards, rounded up to 3/8 yard to buy. One fat quarter (18 x 22 inches) is not quite enough here; a 3/8-yard cut is.
- A queen quilt, 90 x 108 inches, straight-grain binding: Perimeter 2 x (90 + 108) = 396 inches, plus 12 = 408 inches. At 42 inches usable width: 408 / 42 = 9.71, rounded up to 10 strips. Ten strips at 2.5 inches use 25 inches of fabric — 25 / 36 = 0.69 yards, rounded up to 3/4 yard. That is the number to hand the shop, and it is why queen bindings are nearly always a 3/4-yard cut, not a half.
- A table runner, 18 x 72 inches, single-fold 1.5-inch binding: Perimeter 2 x (18 + 72) = 180 inches, plus a 10-inch allowance (single-fold joins are smaller) = 190 inches. At 42 inches: 190 / 42 = 4.52, rounded up to 5 strips. Five strips at 1.5 inches use 7.5 inches of fabric — 7.5 / 36 = 0.21 yards, rounded up to 1/4 yard. A single fat quarter covers this runner with room to spare.
- A round quilt, 60 inches across, bias binding for the curved edge: Perimeter is pi x 60 = about 189 inches. Add 12 inches allowance = 201 inches, then the bias factor: 201 x 1.414 = about 284 inches of bias binding. At 42 inches usable width: 284 / 42 = 6.77, rounded up to 7 strips. Seven strips at 2.5 inches use 17.5 inches — 1/2 yard to buy. Enter width and height that sum to half the measured perimeter (47 x 47.5 inches here) to get the same numbers from the calculator.
Quilt Binding Calculator vs Alternatives
- Specialty quilt-shop binding calculators (the sites ranking today): They do the core math well — perimeter, strips, yardage — and their defaults match what their shops sell. But most lock the strip width at 2.5 inches and the fabric width at 42 inches, and few handle bias binding at all, so a 2.25-inch strip, a 40-inch usable width, or a curved quilt falls outside what they answer. This page lets you change every input, including the bias factor.
- Blog tutorials with a fixed binding formula: The formula in a good tutorial is correct — perimeter plus allowance, divided by fabric width — but you do it by hand, and most tutorials only work the straight-grain case, leaving the 1.414 bias factor unmentioned. A hand calculation also skips the rounding rule: shops cut in 1/8 yards, so a hand-computed 0.49 yards still has to become 1/2 yard at the counter. This calculator does the arithmetic and the rounding together.
- General fabric and yardage calculators: They answer in square inches or total yards: how much fabric area a project needs. What they do not answer is the cutting question — how many strips, at what width, joined how — which is the part that actually sends a quilter to the cutting table. Area without strips is a shopping number, not a cutting plan; this page gives both.
- Static quilt yardage charts: A chart is instant for a standard size: baby, lap, twin, queen, king, each with a precomputed yardage. It is useless the moment a quilt is an odd size — a 63 x 77-inch quilt, a runner, a round quilt — because the chart has no row for it. This calculator covers any size, including the ones no chart lists.
Most binding calculators answer one size at one strip width. This page answers your quilt at your strip width, straight or bias, with the cut list attached — so the number you leave with is the number you cut.
Frequently Asked Questions
How do you calculate quilt binding yardage?
Four steps. First the perimeter: 2 x (width + height) — a 60 x 80-inch quilt is 2 x (60 + 80) = 280 inches. Second, add the joining allowance (12 inches standard) for the binding length: 280 + 12 = 292 inches. Third, strips: binding length divided by usable fabric width, rounded up — 292 / 42 = 6.95, so 7 strips. Fourth, fabric: strips x strip width = 7 x 2.5 = 17.5 inches, divided by 36 = 0.49 yards, rounded up to the nearest 1/8 yard = 1/2 yard to buy. The calculator above runs all four steps for any size, strip width, and fabric width.
What strip width should I cut for quilt binding?
2.5 inches is the standard for double-fold binding: folded in half and wrapped to the back, it shows about 3/8 to 1/2 inch on the front, which is the look most quilts wear. Cut 2.25 inches for a narrower, more delicate edge, or 2.75 inches for a chunkier, more visible edge on a thick quilt (thicker batting needs a wider strip to wrap cleanly). For single-fold binding — table runners and lightweight projects, where the strip is not folded in half — cut 1.25 to 1.5 inches instead. Whatever width you choose, enter it here and the strip count follows.
What is the difference between straight-grain and bias binding?
Straight-grain binding is cut parallel to the selvage, along the grain: it is stable, does not stretch, and is the right choice for any quilt with straight edges. Bias binding is cut at 45 degrees to the grain: it stretches, so it hugs curves, scallops, and round quilts without puckering — but it takes about 41% more length for the same edge (multiply by 1.414), because diagonal strips come out of the fabric less efficiently. A straight-edged quilt never needs bias binding, and a curved edge should never get straight-grain binding.
How many binding strips do I need?
Binding length divided by usable fabric width, rounded up: strips = ceil((perimeter + joining allowance) / fabric width), with the binding length multiplied by 1.414 first for bias binding. Example: a 60 x 80-inch quilt needs 292 inches of straight-grain binding; at 42 inches usable width that is 292 / 42 = 6.95, rounded up to 7 strips. The strips are then joined end to end at a 45-degree angle (which is part of what the joining allowance pays for), pressed open, and folded for sewing.
Why round yardage up to the nearest 1/8 yard?
Because that is how fabric shops cut: yardage is sold in 1/8-yard increments, and a shop cannot cut 0.49 yards — it cuts 1/2 yard. Rounding up also buys insurance: fabric is not always cut perfectly straight, and one miscut strip is exactly the kind of mistake that leaves a binding unfinished. If the math says 0.49 yards, buy 1/2; if it says 0.76, buy 7/8. The extra inches go to the scrap bin, which is a better place for them than a half-bound quilt.
What if my quilt is not a rectangle?
Measure the perimeter and work backward. For a round quilt, the perimeter is pi x diameter (a 60-inch round quilt is about 189 inches around). For a scalloped or curved edge, run a flexible tape around the edge and read the length. Then enter any width and height that add up to half that perimeter — for 189 inches, width + height = 94.5, so 47 x 47.5 inches gives the same perimeter — and the calculator's strip and yardage math follows from the true edge length, not the shape.
Should I use the bolt width or the usable width for fabric width?
The usable width, always: the width left after trimming the selvages, which are too tightly woven and printed to use as binding. A bolt labeled 44 inches usually yields about 42 usable inches; a 42-inch bolt yields about 40. Measure your actual fabric edge to edge minus the selvages and enter that number — using the bolt width instead understates the strip count by a strip on a large quilt.
How much extra fabric for directional prints or stripes?
Add at least one strip's worth, or raise the joining allowance. A directional print (one-way motifs, stripes) has to match across every diagonal join, so each join consumes extra length to line the pattern up — the same reason striped binding looks continuous instead of chopped. If the calculator says 7 strips for a plain fabric, buy 8 strips' worth for a directional one, or raise the allowance from 12 to about 20 inches and let the strip count rise on its own.