Give your quilt a little breathing room. Find the panels, yardage and seam layout for a backing that fits.
Your quilt project
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Use your quilt top dimensions. This project follows you between calculators. All measurements are in inches.
1
Choose your backing
WOF means usable width of fabric, with selvages removed. Measure yours; the width on the bolt may be larger.
4 in per side and ½ in seams are common longarm starting points. Some services need 5 in. Follow your quilter’s requirements.
2
Your backing plan
Fabric to buy
4 ⅛ yards
4.125 yd decimal · rounded up to ⅛ yd
Calculated fabric: 4.0556 yd before rounding
Panels to cut242 × 73 in each
Backing area needed58 × 73inches, including side margins
Width after joining
83 in
Width consumed by seams
1 in
Seams to sew
1
Cut-area excess
31%
Cut-area excess = (cut panel area − required backing area) ÷ cut panel area. It includes seam fabric and trimming, excludes the extra 2.5 in length from purchase rounding, and is not a shrinkage allowance.
Horizontal seams would use 3 ¼ yd. Check whether your print can turn.
Shared links contain these numeric inputs and may appear in web request logs. Project names, order details and email addresses are excluded. Opening a shared link replaces this device’s current dimensions.
Print or save as PDF. The cutting card fits one page.
From plan to cutting mat
Cut 2 panels, each 42 in usable width × 73 in long, after removing selvages.
Join 2 panels along their 73 in edges with a ½ in seam allowance on each piece. Press seams open.
Center the 50 × 65 in quilt top on the 58 × 73 in backing area. This leaves 4 in on each side.
Check your quilter’s requirements before trimming the assembled backing. Keep seams and fabric direction as shown.
Both orientations use whole fabric widths. This compares two straightforward layouts; it does not optimize every possible pieced arrangement or match patterned repeats. Prewash and measure separately if you expect shrinkage.
QuiltCutCalc · quiltcutcalc.com
Quilt backing cutting card
My quilt project · Quilt top 50 × 65 in
Buy 4 ⅛ yd (4.125 yd)
Calculated 4.0556 yd · 2 × 42 × 73 in panels · vertical seams · ½ in seam allowance
Cut 2 panels, each 42 in usable width × 73 in long, after removing selvages.
Join 2 panels along their 73 in edges with a ½ in seam allowance on each piece. Press seams open.
Center the 50 × 65 in quilt top on the 58 × 73 in backing area. This leaves 4 in on each side.
Check your quilter’s requirements before trimming the assembled backing. Keep seams and fabric direction as shown.
Required backing: 58 × 73 in. Joined width: 83 in. Cut-area excess: 31%, including seams and trimming, excluding purchase rounding.
Generated at quiltcutcalc.com — Six-page printable project planner: USD $4.99 one-time. See current purchase availability at quiltcutcalc.com/pricing/.
English extended guide
Use the quilt backing calculator above with your measured top, usable fabric width and quilting service’s required margin. This English extended guide explains the panel geometry before you buy or cut.
How the Quilt Backing Calculator Computes Exact Yardage
Measure the completed quilt top across its width and length, including its current outer edges. Enter inches, then choose the overhang allowance required on every side. A 60 × 80 inch top with 4 inches per side needs a backing rectangle 68 × 88 inches. Adding only 4 inches overall leaves half the requested margin. Confirm the margin with your quilting service; domestic projects can need a different allowance.
Usable WOF means width of fabric after excluding selvages. Measure it; bolt labels can differ. If your measured width is 40.5 inches, enter 40.5. The quilt backing calculator does not subtract another fixed 1.5 inches. Deducting that twice would inflate backing yardage; ignoring a real selvage would understate the panel count. The chart below intentionally assumes actual usable widths of 42 and 108 inches.
Each seam consumes an allowance on both pieces. With a half inch on each panel, a joined pair loses 1 inch: 42 + 42 − 1 = 83 inches. Three panels have two joins and cover 124 inches. The quilt backing calculator selects the smallest whole panel count that covers the required span, then multiplies that count by the perpendicular cutting length. Divide those total cutting inches by 36 and round purchase yardage upward to an eighth. Keep the unrounded figure for checking the cutting plan. Washing loss and matching repeats are separate additions, so a rounded purchase figure does not automatically provide enough for either operation.
Check panel count at the boundary by testing one fewer panel. If the requested span is 84 inches, two usable 42 inch panels fail because they join to 83. Choosing three is therefore a coverage requirement. Rounding the yard purchase upward cannot repair a missing panel across the other direction.
Joined span = n × usable WOF − 2 × seam allowance × (n − 1)
Choose the smallest whole n covering the selected span; raw yards = n × panel cut length ÷ 36
Purchase yards = ceiling(raw yards × 8) ÷ 8
Horizontal vs. Vertical Backing Seams: Which Saves More Fabric?
Compare both orientations rather than assuming that a horizontal seam always saves fabric. Vertical seams join panels across the backing width, with each panel cut to the backing length. Horizontal seams stack panels across the backing length, with each cut measured from the backing width. Changing direction changes both the number of panels and their cutting length. A shorter individual cut can still require more total backing yardage if an extra panel becomes necessary.
For the 60 × 80 inch example, the required rectangle is 68 × 88. Two usable 42 inch widths cover only 83 inches after one half-inch-per-piece join. They can cover the 68 inch span vertically, but cannot cover the 88 inch span horizontally. The vertical plan cuts two 88 inch panels: 176 ÷ 36 = 4.8889 yards, purchased as 5 yards. The horizontal seam plan needs three 68 inch panels: 204 ÷ 36 = 5.6667 yards, purchased as 5.75 yards. A supposed two-panel 3.75 yard horizontal plan is too short across the joined direction.
At 40.5 inches usable width, the pair covers only 80 inches. The same 88 inch horizontal requirement still needs three panels. For a shorter 60 × 72 inch top, however, 4 inch margins create 68 × 80. Two usable 42 inch widths cover that 80 inch length, so a horizontal seam plan cuts two 68 inch panels and buys 3.875 yards. The vertical plan cuts two 80 inch panels and buys 4.5 yards. This is a real geometry change, not a universal saving claim.
Wide quilt backing also needs both directions checked. If either required dimension fits the measured usable width, one panel may suffice; the purchased length then follows the other dimension. A directional print can rule out rotation. Consult the quilter about seam placement and loading before selecting the lower number. The quilt backing calculator diagram centers the required rectangle for inspection; an offset seam or partial-width arrangement needs a separately checked cutting plan.
60 × 80 inch top, 4 inch margins, 42 usable inches, half-inch seams; drawing shows orientation schematically.
Standard Quilt Backing Yardage Chart (42" vs. 108" Wide Fabric)
These eight examples use 4 inches of overhang allowance per side, half-inch joining allowances on each piece, and the cheaper full-width orientation by purchase yardage. Every figure rounds upward to an eighth of a yard. Measure your own top; size names are examples.
The columns assume actual usable widths after selvages, not bolt labels. A 90 × 100 top requires 98 × 108 backing: 108 usable inches fit exactly, whereas 106.5 do not cover the longer span in one rotated panel. Washing and matching allowances are absent.
Read panel count with backing yardage. Both Cal King spans exceed 108 inches, so even wide cloth needs piecing. The King single-panel plan requires rotation. Recalculate actual width in the quilt backing calculator.
To reproduce a row, add the margins first, test joined coverage in both directions, and then round each purchase separately. In the Twin row, vertical construction needs two 98 inch cuts, totaling 196 inches and rounding to 5.5 yards. Horizontal construction needs three 78 inch cuts, totaling 234 inches and rounding to 6.5 yards. The table retains the smaller valid purchase. Keep the alternative if its seam placement better suits the project. For a supplier selling quarter-yard increments, round the listed eighth-yard result upward again: 2.625 becomes 2.75 yards. Never round downward because a preferred shopping increment is larger than the calculated one.
Purchase yards and panel counts; best valid full-width direction under the stated assumptions
Example top (in)
Required backing (in)
42 in usable: panels / yards
108 in usable: panels / yards
Baby 36 × 52
44 × 60
2 / 2.5
1 / 1.25
Crib 45 × 60
53 × 68
2 / 3
1 / 1.5
Throw 60 × 72
68 × 80
2 / 3.875
1 / 2
Twin 70 × 90
78 × 98
2 / 5.5
1 / 2.25
Full/Double 84 × 90
92 × 98
3 / 7.75
1 / 2.625
Queen 90 × 100
98 × 108
3 / 8.25
1 / 2.75
King 108 × 100
116 × 108
3 / 9
1 / 3.25
Cal King 104 × 108
112 × 116
3 / 9.375
2 / 6.25
3 Worked Quilt Backing Examples (Step-by-Step Math)
Check panel span before purchase yardage. Keep seam consumption, print matching and buying increments separate.
1. A 60 × 80 lap quilt: the horizontal seam counterexample
Add 8 inches overall to obtain 68 × 88. At 42 usable inches with half-inch seams, horizontal panels span 42, 83, then 124 inches. The 88 inch target requires three panels. Cut each 68 inches long: 204 ÷ 36 = 5.6667 raw yards; buy 5.75. Vertical panels need only two widths to span 68 and use 176 inches; buy 5. The quilt backing calculator favors vertical seams here, subject to print and loading constraints.
The 5 yard vertical purchase contains 180 inches before preparation, leaving only 4 inches beyond the 176 inch cutting total. Treat that remainder as a measurable buffer, not a guaranteed allowance for washing or squaring.
2. A 90 × 100 queen: three narrow panels or one wide panel
The required backing is 98 × 108. Three usable 42 inch widths join to 124 inches. Horizontal orientation cuts three 98 inch panels: 294 ÷ 36 = 8.1667 raw yards, rounded to 8.25. Vertical orientation cuts three 108 inch panels and buys 9 yards. With genuinely usable 108 inch wide quilt backing, rotate the rectangle and cut one 98 inch length, buying 2.75 yards. If the motif cannot rotate, cut 108 inches and buy 3 yards instead. The backing fabric yardage difference alone does not establish a price saving.
3. A directional print with a 12 inch repeat
Start with the vertical lap plan: two 88 inch panels and 176 cutting inches. Suppose the selected motif alignment requires reserving one extra 12 inch repeat per panel. Budget two 100 inch blanks: 200 ÷ 36 = 5.5556 raw yards, purchased as 5.625. That is a conservative matching assumption, not an automatic allowance in the tool. Lay the repeat beside the intended seam, establish matching points, then trim to the required panel length. For an irregular or half-drop repeat, verify the actual offset before purchasing; a single extra repeat may not resolve every arrangement.
Ask the quilting service for its margin, seam-direction and loading requirements before cutting. Confirm whether the requested 4 inches is measured on every side and whether batting has a separate requirement. A 68 × 88 backing for a 60 × 80 top meets that geometric margin only if both pieces are square and aligned. A diagonal corner measurement cannot establish the usable rectangular area.
Inspect selvages, seam allowances and pressing as separate checks. APQS recommends half-inch backing seams with allowances pressed open and selvages removed. This reduces seam bulk at the frame rollers. Do not treat the calculator’s centered illustration as a recommended seam position: APQS also discusses moving a seam off the center fold or using a center panel. Ask the service where it wants seams, rather than assuming all quilters reject the same four conditions.
Measure the prepared backing after washing, piecing and squaring. Mark its top edge if direction matters. Check the narrowest usable span, the full cut length and the seam’s position against the final top. If any dimension falls short, revise backing yardage before packing. Check the physical cloth against the cutting card.
Frequently Asked Questions About Quilt Backing Yardage
How many inches larger should quilt backing be than the quilt top?
A common starting allowance is 4 inches per side, adding 8 inches to both dimensions. Ask your longarm service what its frame needs; domestic quilting may use another amount. Measure the prepared top before adding that allowance. Check all four sides after the top is centered on the prepared backing.
Why do quilters use a 1/2-inch seam allowance on backing instead of 1/4-inch?
APQS recommends half-inch backing seams pressed open to reduce bulk. Half an inch on each piece consumes 1 inch of combined width per join. Confirm the preferred seam construction with your quilter, especially for unusual fabrics or loading arrangements. Sew a sample join and measure its actual combined width before piecing full panels.
When does 108-inch wide backing fabric cost less than standard 42-inch cotton?
Multiply actual purchase yards by each fabric’s price per yard. The queen example uses 8.25 yards of usable 42 inch cloth or 2.75 yards of usable 108 inch cloth when rotation is permitted. No fixed saving follows without prices, matching requirements and measured width. Include any extra lengths required by the chosen motif alignment in that comparison.
Should I remove the selvage edges before sewing quilt backing seams?
Remove selvages from joining edges, following the preparation method agreed with your quilter. Enter the remaining usable width. The quilt backing calculator does not subtract a standard amount again, because widths differ and you may already have measured the trimmed cloth. Recheck the trimmed width at several points along the bolt before cutting.
How do I calculate extra backing fabric for matching directional or striped prints?
Measure the repeat and draw matching points on each panel. A full repeat per panel is a conservative starting budget, illustrated with two 12 inch additions. Check half-drop arrangements separately. Add matching fabric before purchase rounding and verify the layout before cutting. Mark each matching point before shortening either panel.