Skip to tool content
Toolioz logoToolioz

Quilt Size Calculator

A quilt size calculator adds a block grid, sashing between blocks, and borders, then compares that rectangle to a mattress plus drop. Mattress numbers are common US sizes; drop is an estimate and should be measured on the actual bed.

Quick Summary & Direct Answer
Craft

How large is an 8×9 grid of 6 in blocks with 1 in sashing and a 4 in border?

Blocks and between-block sashing make a 55 × 62 in body (8×6 + 7×1 wide, 9×6 + 8×1 long). A 4 in border on each side finishes 63 × 70 in (160 × 178 cm). A queen mattress with a 12 in coverlet drop wants about 84 × 92 in, so this layout is a wall quilt, not a bedspread.

Key Takeaways

  • Sashing is between blocks (one fewer strip than the block count), not an extra outer frame.
  • Drop hangs on both sides and the foot, not the pillow edge, in this model. The 12 in preset is a coverlet, not a floor-length bedspread.
  • UK centimetres are listed next to inches.
  • Mattress sizes here are US; a UK double is closer to US full. Twin is listed as 39 in; some makers use 38 in.

Drop is added to both sides and the foot only. The 12 in preset is a coverlet estimate and can be wrong for a tall frame or a floor-length bedspread. Measure the bed. Outer sashing is not added; put extra width in the border field.

Finished quilt

63 × 70 in

Centimetres160 × 177.8
Target bedspread84 × 92 in
Width vs target-21 in
Length vs target-22 in

Results can be wrong. This calculator is unofficial. Figures can be incomplete, rounded, or not updated. Use them at your own risk and check a tape, datasheet, ball band, or official chart before cutting, mixing, buying, or publishing. Bed drop is an estimate. Measure the real mattress and frame; the 12 in preset is a coverlet, not a floor-length drop, and the head/pillow edge has no drop in this model. Limits of liability are in the terms of service.

Frequently asked questions

No. Quilt as desired, then expect a little draw-up. Add extra border if the batting is lofty.

Explore Related Tools

Yarn Calculator

Estimates yarn grams, yards, and 100 g skeins for a blanket, scarf, or hat.

Try tool

Cross Stitch Fabric Calculator

Cuts Aida or evenweave fabric size from stitch counts, fabric count, and over 1 or 2.

Try tool

Knitting Gauge Calculator

Converts a knitting gauge swatch into cast-on stitches and a pattern adjustment factor.

Try tool

Crochet Gauge Calculator

Converts a crochet gauge swatch into stitch counts and a pattern adjustment factor.

Try tool

Publisher notes · reviewed 29 October 2026

Sashing sits between blocks

Width = blocksX × block + (blocksX − 1) × sashing + 2 × border. A queen bedspread target is mattress 60 in plus two drops on the sides and one drop at the foot. The 12 in drop is a coverlet estimate and can be wrong for the actual frame. US mattress sizes are used.

Crochet blankets

Set sashing to 0 and treat motifs as blocks. Join-as-you-go width belongs in the block size.

Worked examples

  • 8×9 of 6 in blocks, 1 in sashing, 4 in border

    Body 55 × 62 in, finished 63 × 70 in.

Limits of this page

  • Batting loft shrinks the quilt after quilting.
  • UK doubles are closer to US full than US queen.
  • Bed drop is not added at the pillow edge; measure the real hang.

Sources