Quilt Block Calculator — Blocks & Fabric
Calculate the number of blocks and fabric needed for your quilt layout.
Standard: 0.75cm (1/4in)
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.