Quilt Binding Strip Planning Calculator

How to use this estimate

Required binding follows the quilt perimeter, with the entered extra length reserved for corners and finishing tails. Each seam joining two crosswise strips consumes twice its allowance from the combined binding length. This estimates crosswise strips and does not account for directional prints or damaged fabric.

Method

Required length = 2 × (width + length) + extra. Choose the smallest strip count n for which n × usable bolt width - 2 × seam allowance × (n - 1) covers the required length. Cut fabric length = strip count × strip width; yardage = cut length / 36.

Worked example

A 60 × 80 in quilt plus 24 in of tails needs 304 in of binding. At 42 in usable width and ⅜ in joining seams, 8 strips cut 2½ in wide use 20 in (0.56 yd) of fabric length.

Assumptions and supported inputs

Use measured dimensions and the listed field ranges. Values outside those bounds, missing entries, non-finite numbers, and fractional counts where a whole number is required are rejected. Displayed results are rounded to two decimal places; internal calculations retain full precision. This is a planning estimate, not a substitute for an on-site layout, product instructions, or a qualified trade decision where applicable.

Related planning tools

Quilt Backing Seam Layout Calculator · fabric shrinkage yardage calculator

Northstar Calculators provides this arithmetic for scenario planning. Verify the assumptions and physical fit before buying or building.