Quilt Block Calculator — Blocks & Fabric
Calculate the number of blocks and fabric needed for your quilt layout.
How We Calculate This
The calculator determines how many blocks fit across and down the quilt, then calculates fabric needed to cut all blocks from a single fabric.
The formula
Blocks across = ceil(Quilt width ÷ Block size)
Blocks down = ceil(Quilt length ÷ Block size)
Cut size = Block size + (Seam allowance × 2)
Fabric rows = ceil(Total blocks ÷ Blocks per fabric row)
Frequently Asked Questions
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Last updated: February 2026
All calculations are estimates. Always verify quantities before cutting or purchasing fabric.