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Quilt backing calculator
Backing size and yardage, with the smartest seam direction.
In short
Cut backing 4 in (10 cm) larger than the quilt top on every side for longarm quilting, or 2 to 3 in (5 to 8 cm) for domestic quilting. A 60 x 70 in throw needs a 68 x 78 in backing: two panels with a horizontal seam, 3 7/8 yd of 42 in fabric.
in
in
Extra on each side
Backing size
How to use it
- Enter your finished quilt top size.
- Pick longarm or home machine for the overhang.
- Choose your fabric width and buy the length marked Best choice.
Pip's tips
- Trim off the selvages before seaming and press backing seams open for a flat finish.
- Many longarm quilters love horizontal seams that run parallel to the rollers. Ask yours.
- Batting is cut to the same size as the backing.
Sources: Every number follows the SewNQuilt quilting and sewing standards, built from published industry references. Imperial and metric are calculated natively, never converted piece by piece.
Keep this with you
Save every result to a project, add fabric to your shopping list and work offline in the SewNQuilt app.
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