How much backing do I need for a 60 by 80 inch quilt?

With 4 inches of overage on every edge the backing is 68 by 88 inches. From 44 inch usable fabric with a half inch seam allowance, the vertical plan is 2 panels cut 88 inches long: 176 inches, exactly 44/9 yards (about 4.89), rounded up to 5 yards. The horizontal plan is 3 panels cut 68 inches long, 204 inches total, rounded up to 5 3/4 yards. Change any supplied measurement and both plans update.

How much extra backing should I allow beyond the quilt top?

The extra per edge is an input you supply from your own job requirements. Four inches is the opening example, with no claim that it fits every quilt or quilting setup. The page adds twice that value to both top dimensions. Zero makes the backing the top size before any seam loss, and positive extras have no physical size cap imposed by the calculator.

Why does the seam allowance change the number of panels?

Every seam takes the allowance from both of the edges it joins, so joining panels of 44 inches with a half inch allowance gives 87 inches of stitched width, not 88. That matters at the boundary: an 88 inch backing is exactly two widths on paper, and one inch short once the seam is sewn. This page counts the smallest number of panels whose stitched width actually covers the backing.

Should the backing seams run down the length or across the width?

The page computes both uniform panel directions and Best fit shows the one with the lower yardage rounded up to an eighth. On an equal buy quantity, Down the length appears first by a fixed tie rule. You can choose either direction yourself. This comparison uses the supplied dimensions and seam losses; it does not choose a direction for print matching or a quilting setup.

What changes if I use 108 inch wide backing fabric?

For the same 60 by 80 inch top with 4 inches per edge, one cut of 68 inches from 108 inch usable fabric covers the 68 by 88 inch backing when turned. That is 68/36 yards exactly, rounded up to 2 yards, with no joining seam. Type 108 into Fabric width to compare this with narrower fabric. Other dimensions can still need multiple panels.

Does the yardage allow for shrinkage or for matching a print?

No. These figures use the supplied dimensions with no added factor for washing, shrinkage, print matching, pattern repeats or edge straightening. Total cut inches equal the number of panels times each cut length. The only upward rounding is the stated next eighth of a yard; the complete report keeps the unrounded exact quantity too.

What does usable fabric width mean here?

It is the width available for this backing after any edges you exclude, rather than a width inferred from a fabric label. Supply that usable measurement yourself. For multiple panels, each seam then removes the supplied allowance from both joined edges. The page does not infer a usable width or a shrinkage adjustment from a stated bolt width.

Does this calculate diagonal backing or quilt binding?

No. The two supported directions use uniform rectangular panels with seams down the length or across the width. John Flynn diagonal backing and binding require different calculations. The schematic panel diagram does not implement a diagonal method.

Can I save the complete backing plan as a PDF?

There is no PDF download on this page. Copy sends the complete exact report to the browser clipboard. If clipboard access is refused or takes too long, the report opens as selectable text so you can copy it manually. It includes both directions, complete measurements, exact yardage and assumptions.

Quilt Backing Calculator

Enter the finished top, the extra you want on every edge and the usable width of your fabric, and this page returns the backing size, the panel count, the cutting plan and the yardage to buy. It counts the seam allowance that disappears into every join, which is the step that turns an 88 inch backing from two widths of 44 inch cotton into three, and it works the backing out both ways round: panels joined with the seams down the length, and panels joined with the seams across the width. The exact length is printed beside the figure rounded up to the next eighth of a yard, so you can see what the counter will actually cut. This is a uniform rectangular-panel plan in inches. Supply the extra per edge, usable fabric width and seam allowance; the page chooses none of those for you. Both seam directions retain exact panel counts, total cut inches and yardage rounded up to the next eighth. The complete selectable report includes the full supplied measurements, exact fractions or terminating decimals, both directions and the assumptions. Shortened displays are marked. The diagram is schematic and omits seam lines above 40 panels while retaining the full count. For wide backing, including 108 inch usable fabric, change the fabric width on this same page. A single panel is possible only when that width covers the needed backing side. The page does not calculate John Flynn diagonal backing, quilt binding, shrinkage or pattern-repeat allowances, and it offers no PDF download or separate app.

Top 60 x 80 inOverage 4 inWidth 44 inSeam 1/2 in

top       60 in x 80 inoverage   4 in all roundfabric    44 in usable, 1/2 in seamsbacking   68 in x 88 in   4 in beyond the top on every edgepanels    2   1 seam, down the lengthcut       88 in each   stitched 87 in against 68 in neededyardage   5 yd   176 in, 4 8/9 yd; exact in report

Backing: 68 x 88 in+4 in each edge

Panels: 2of 44 in

Seams: 1down the length

Yardage: 5 yd4 8/9 yd; exact in report

Measurements are inches. Enter decimals, fractions, mixed numbers or scientific notation, such as 60.5, 60 1/2 or 6.05e1. Supply the usable fabric width, extra per edge and seam allowance yourself. The calculation accepts up to 8192 characters per field, 512 significant digits per numeric component and a normalized decimal scale from -4096 to 4096. Longer drafts stay intact and receive an error.

Complete exact backing report

Quilt backing calculation
quiltWidth supplied: 60 in; exact: 60 in
quiltLength supplied: 80 in; exact: 80 in
overage supplied: 4 in; exact: 4 in
fabricWidth supplied: 44 in; exact: 44 in
seamAllowance supplied: 1/2 in; exact: 0.5 in
Seam direction requested: auto
Backing: 68 by 88 in
Down the length buys less: 5 yd compared with 5 3/4 yd for Across the width.

Down the length (selected): 2 panels; 1 seams
Cut each panel: 88 in from 44 in usable width
Stitched joined width: 87 in; needed: 68 in; trim: 19 in
Stitched rectangle: 87 by 88 in
Total cut length: 176 in
Exact yardage: 44/9 yd
Buy yardage (rounded up to 1/8): 5 yd
Cut 2 panels of 88 in; join along the cut-length edges with 0.5 in from each edge at each join; trim the stitched rectangle to 68 by 88 in.

Across the width: 3 panels; 2 seams
Cut each panel: 68 in from 44 in usable width
Stitched joined width: 130 in; needed: 88 in; trim: 42 in
Stitched rectangle: 68 by 130 in
Total cut length: 204 in
Exact yardage: 17/3 yd
Buy yardage (rounded up to 1/8): 5.75 yd
Cut 3 panels of 68 in; join along the cut-length edges with 0.5 in from each edge at each join; trim the stitched rectangle to 68 by 88 in.

Assumptions:
All dimensions are supplied in inches. Backing width and length each equal the finished top plus twice the supplied extra per edge.
Fabric width is the supplied usable width. This page does not infer usable width from a label or choose an overage or seam allowance.
Joining n panels of width f with allowance s leaves n × f − 2 × s × (n − 1) inches. No allowance is lost on the outer unjoined edges.
Total cut length is panels × cut length; exact yards are total inches ÷ 36. The buy quantity rounds upward once to a multiple of 1/8 yard.
No extra is added for shrinkage, print matching, pattern repeats, edge straightening or cutting errors. These are uniform vertical or horizontal panels; no diagonal or binding plan is calculated.
The diagram is schematic. Seam lines are omitted above 40 panels; the complete count and exact dimensions remain in the report. Shortened displays are marked; the report retains complete exact fractions or terminating decimals.

Cut 2 lengths of 88 in from 44 in usable fabric: 176 in total; buy 5 yd.
Join the panels along their 88 in edges using the supplied 1/2 in allowance from each edge at every seam.
Trim the stitched 87 by 88 in rectangle to 68 by 88 in: 19 in comes off the width.

Down the length buys less: 5 yd compared with 5 3/4 yd for Across the width. The other direction takes 3 panels and 5 3/4 yd.

All dimensions are supplied in inches. Backing width and length each equal the finished top plus twice the supplied extra per edge.
Fabric width is the supplied usable width. This page does not infer usable width from a label or choose an overage or seam allowance.
Joining n panels of width f with allowance s leaves n × f − 2 × s × (n − 1) inches. No allowance is lost on the outer unjoined edges.
Total cut length is panels × cut length; exact yards are total inches ÷ 36. The buy quantity rounds upward once to a multiple of 1/8 yard.
No extra is added for shrinkage, print matching, pattern repeats, edge straightening or cutting errors. These are uniform vertical or horizontal panels; no diagonal or binding plan is calculated.
The diagram is schematic. Seam lines are omitted above 40 panels; the complete count and exact dimensions remain in the report. Shortened displays are marked; the report retains complete exact fractions or terminating decimals.

60 x 80 top, 44 in fabric4 in all round, 1/2 in seams
2 panels, 5 yd, seams down the length
108 in wide backingthe same top, one cut
1 panel, 2 yd, seams across the width
Wide top, 90 x 60 inthe seams turn the other way
2 panels, 5 1/2 yd, seams across the width

Cloth, counted both ways round. Exact arithmetic on the measurements you enter, rounded up to the next eighth of a yard. It assumes the overage you set on every side and does not allow for shrinkage or directional prints. The seam allowance is the part most backing calculators leave out: every join takes it from both edges, so the stitched width is printed here against the width the backing actually needs. Whether to prewash, and how much to add for a print you want matched across a seam, are yours to decide and are not folded into the figures.

Common questions

How much backing do I need for a 60 by 80 inch quilt?: With 4 inches of overage on every edge the backing is 68 by 88 inches. From 44 inch usable fabric with a half inch seam allowance, the vertical plan is 2 panels cut 88 inches long: 176 inches, exactly 44/9 yards (about 4.89), rounded up to 5 yards. The horizontal plan is 3 panels cut 68 inches long, 204 inches total, rounded up to 5 3/4 yards. Change any supplied measurement and both plans update.
How much extra backing should I allow beyond the quilt top?: The extra per edge is an input you supply from your own job requirements. Four inches is the opening example, with no claim that it fits every quilt or quilting setup. The page adds twice that value to both top dimensions. Zero makes the backing the top size before any seam loss, and positive extras have no physical size cap imposed by the calculator.
Why does the seam allowance change the number of panels?: Every seam takes the allowance from both of the edges it joins, so joining panels of 44 inches with a half inch allowance gives 87 inches of stitched width, not 88. That matters at the boundary: an 88 inch backing is exactly two widths on paper, and one inch short once the seam is sewn. This page counts the smallest number of panels whose stitched width actually covers the backing.
Should the backing seams run down the length or across the width?: The page computes both uniform panel directions and Best fit shows the one with the lower yardage rounded up to an eighth. On an equal buy quantity, Down the length appears first by a fixed tie rule. You can choose either direction yourself. This comparison uses the supplied dimensions and seam losses; it does not choose a direction for print matching or a quilting setup.
What changes if I use 108 inch wide backing fabric?: For the same 60 by 80 inch top with 4 inches per edge, one cut of 68 inches from 108 inch usable fabric covers the 68 by 88 inch backing when turned. That is 68/36 yards exactly, rounded up to 2 yards, with no joining seam. Type 108 into Fabric width to compare this with narrower fabric. Other dimensions can still need multiple panels.
Does the yardage allow for shrinkage or for matching a print?: No. These figures use the supplied dimensions with no added factor for washing, shrinkage, print matching, pattern repeats or edge straightening. Total cut inches equal the number of panels times each cut length. The only upward rounding is the stated next eighth of a yard; the complete report keeps the unrounded exact quantity too.
What does usable fabric width mean here?: It is the width available for this backing after any edges you exclude, rather than a width inferred from a fabric label. Supply that usable measurement yourself. For multiple panels, each seam then removes the supplied allowance from both joined edges. The page does not infer a usable width or a shrinkage adjustment from a stated bolt width.
Does this calculate diagonal backing or quilt binding?: No. The two supported directions use uniform rectangular panels with seams down the length or across the width. John Flynn diagonal backing and binding require different calculations. The schematic panel diagram does not implement a diagonal method.
Can I save the complete backing plan as a PDF?: There is no PDF download on this page. Copy sends the complete exact report to the browser clipboard. If clipboard access is refused or takes too long, the report opens as selectable text so you can copy it manually. It includes both directions, complete measurements, exact yardage and assumptions.

Exact arithmetic on the measurements you enter, rounded up to the next eighth of a yard. It assumes the overage you set on every side and does not allow for shrinkage or directional prints.