Quilt Calculator
Planning a quilt? Enter your finished quilt size, block dimensions, sashing, and border widths to see exactly how many blocks you need and how much fabric to buy for every part of the quilt top and backing.
How the calculation works:
- Blocks: The calculator figures out how many blocks fit across and down after subtracting the border. Seam allowances are added to each block for cutting.
- Sashing: If you add sashing (strips between blocks), the calculator accounts for horizontal and vertical strips and calculates fabric separately.
- Border: Four strips cut to the quilt's finished dimensions, with seam allowances.
- Backing: The quilt's dimensions plus 4 inches of overhang per side for quilting. If the quilt is wider than the fabric bolt, multiple panels are calculated.
Standard quilt sizes:
- Baby: 36" x 52"
- Throw: 50" x 65"
- Twin: 68" x 90"
- Full/Double: 80" x 90"
- Queen: 88" x 96"
- King: 104" x 96"
Fabric tips:
- Always buy 10-15% extra to account for cutting mistakes and shrinkage
- Pre-wash quilting cotton before cutting -- it typically shrinks 3-5%
- Standard quilting cotton bolts are 44-45 inches, but you only get about 42 inches of usable width after removing selvages