How To Calculate Quilt Backing - Quilt Kit Shop
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How To Calculate Quilt Backing

Most quilting fabrics today have 42” useable width of fabric. Calculate how much fabric you need for backing based on this width.
Bed size quilts are as shown below.

QUILT SIZE    LAYOUT SIZE    YARDS NEEDED
Twin Size        72" x 90"                5-1/3 yards
Full Size          84" x 96"                8-1/2 yards
Queen Size     96" x 108"              91/2 yards
King Size       120" x 120"            10-1/2 yards

Quilts less than 40" wide can use 1 length of fabric.

If you make a quilt smaller than a bed quilt you can use this formula to figure how many yards of fabric you need to purchase.

1. Add 6" to the width of your finished quilt.
2. Divide the width of your quilt by the width of the fabric. Our example is 42".
3. Round up to the nearest whole number.
4. This is how many lengths of fabric you will need. Remember this number.

Next Step:
A. Add 6" to the length of your finished quilt.
B. Multiply the length of your quilt by the number of fabric lengths you need, the answer from # 4.
C. Divide the result by 36, because this equals one yard. The answer will show how many yards you need to buy.

Next you will find your yardage equivalents.

YARDAGE INCHES   DECIMAL
1/8 yard 4-1/2" .125
1/4 yard 9" .25
1/3 yard 12" .333
3/8 yard 13-1/2" .375
1/2 yard 18" .50
5/8 yard 22-1/2" .625
2/3 yard 24" .666
3/4 yard 27" .75
7/8 yard 31-1/2" .875
1 yard 36" 1.00