Quilting Fabric Calculator
Enter quilt size and block size to get block count and fabric yardage for top, backing, and binding.
This tool is for informational and educational purposes only. It is not a substitute for professional financial, medical, legal, or engineering advice. See Terms of Service.
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This calculator takes your quilt size and block size and tells you exactly how many blocks to cut and how much fabric to buy for every part of the quilt. Here is how to use it:
- Choose your quilt size. Select from standard presets (baby through king) or use Custom to enter your own dimensions in inches.
- Enter block size. This is the finished block size (before seams). Common sizes are 6", 8", 10", and 12". The calculator adds seam allowance automatically.
- Add sashing width. If your design uses sashing strips between blocks, enter the finished sashing width. Enter 0 for no sashing.
- Read your results. You will see the total block count, fabric needed for the quilt top, backing yardage, binding yardage, and the size of batting to buy. All fabric estimates include a small buffer for cutting errors.
Backing yardage assumes 44" wide fabric with a seam down the middle for wider quilts. Binding assumes 2.5" strips cut from the width of fabric. Buy binding fabric as a fat quarter minimum.
About the Quilting Fabric Calculator
Quilt top yardage is calculated by multiplying the number of blocks by the unfinished block area (finished size plus 1" for seam allowances), then converting to yards from a 44" wide fabric. A 10% buffer is included to account for trimming and cutting errors. Backing fabric requires the quilt dimensions plus 4 inches on each side for adequate overlap in the frame or hoop. Wide quilts (over 44") require a seam in the backing, which the calculator accounts for by doubling the panel width. Binding uses the standard 2.5" strip method: calculate the quilt perimeter, divide by usable fabric width, and multiply by the strip width to get yardage.
Frequently Asked Questions
How many quilt blocks do I need for a queen size quilt with 10" blocks?
A queen size quilt (86"×96") with 10" finished blocks needs a 9×10 grid, which is 90 blocks. With 10" blocks and no sashing, the quilt top measures approximately 90"×100", which covers the standard queen mattress with drop. You would need roughly 7 yards of fabric for the top (split across different fabrics for a patchwork design), about 8.5 yards for backing, and just under 1 yard for binding.
Why does backing need more yardage than the quilt top?
Backing fabric needs to extend 4 inches beyond the quilt top on all sides so the layers can be properly secured in a quilting frame or with safety pins. This extra fabric also gives you room to square up the finished quilt. For queen and king quilts, the backing must be seamed from two or three panels of fabric because standard quilting cotton is only 40–44" wide, adding extra yardage to account for the overlap at the seam.
What size batting do I buy for a twin quilt?
For a 68"×90" twin quilt top, you need batting that measures at least 76"×98" (adding 4" per side). Most packaged twin batting is sold at 72"×90" or 81"×96", so check the label before buying. If the packaged size does not give you enough overhang, buy the next size up or purchase batting by the yard. The calculator shows the exact batting dimensions you need.
How does sashing affect the number of blocks I need?
Sashing strips add space between blocks, which means you need fewer blocks to fill the same quilt dimensions. For example, a quilt that needs 90 blocks at 10" with no sashing might only need 63 blocks at 10" with 2" sashing, because the sashing adds 2 inches of width and height for every block position. The calculator includes sashing in its block count calculation so you never buy or cut more blocks than you need.