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Quilt binding and backing calculator

Binding length is the perimeter plus enough to turn the corners and join the ends.

Binding strips to cut
8
= Exact Quilt binding
Binding length needed
876
Fabric for binding
51
Fabric for backing
480
Backing panels to join
2
Batting area
4.800
Quilt perimeter
800
Show the working
  1. Quilt length = 220
  2. Quilt width = 180
  3. Binding strip width = 6.35
  4. Fabric width = 110
  5. Backing overhang each side = 10
  6. Quilt perimeter = 2 * (220 + 180) = 800
  7. Binding length needed = 800 + 4 * 6.35 * 2 + 25 = 875.8
  8. Binding strips to cut = ceil(875.8 / 110) = 8
  9. Fabric for binding = 8 * 6.35 = 50.8
  10. backing_length = 220 + 2*10 = 240
  11. backing_width = 180 + 2*10 = 200
  12. Backing panels to join = ceil(200 / 110) = 2
  13. Fabric for backing = 2 * 240 = 480
  14. Batting area = 240 * 200 / 10000 = 4.8

Values are shown to six significant figures here; the arithmetic itself runs on exact fractions and is only rounded where a number is printed.

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    The formula

    • binding length = perimeter + corner allowance + join allowance

    Backing and batting are cut oversize because quilting draws the layers in as it goes.

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