Craft & Making
Quilt Binding Calculator
Enter quilt size and strip width to see binding length and fabric needed.
How much binding fabric?
Binding wraps the quilt edge: compute the perimeter 2 × (length + width), add join waste for stripping and miters, then cut strips across the fabric width and join them end to end. Fabric length ≈ number of strips × strip width, where strips = ceil(binding length ÷ fabric width). Straight-grain binding is the usual estimate here; bias binding for curves uses more fabric and a different cutting layout. Strip width depends on whether you fold double or single binding. Cross-check overall fabric buys with fabric meterage and piece cut sizes with seam allowance.
Worked example
A 200 × 150 cm quilt has perimeter 700 cm; plus 30 cm join waste → 730 cm binding. On 110 cm fabric with 6.5 cm strips: ceil(730/110) = 7 strips → 7 × 6.5 = 45.5 cm of fabric (about £3.64 at £8/m).
Limits and assumptions
Straight-grain estimate. Bias binding, flange bindings and machine-binding waste differ. Always cut one test strip for fold depth.
Frequently asked questions
What strip width should I use?
Common double-fold bindings land around 5–7 cm cut width depending on finished binding width and loft — match your pattern.
Why add join length?
Diagonal joins and starting overlaps consume length beyond the bare perimeter.
Can I cut strips along the length?
Yes for continuous bias or special layouts; this tool assumes strips cut across the bolt width.
Does pieced binding change the maths?
Total length needed is the same; piecing leftover scraps can reduce new fabric if colours match.