How to Choose Quilt Batting Size and Loft

Batting sits between the quilt top and backing, but it affects much more than warmth. Its fibre, loft and dimensions influence drape, stitch definition, washing and the amount of material that must be loaded on a quilting frame. Choosing it before calculating the backing helps prevent a last-minute mismatch.

Start with the measured quilt top

Measure the completed top through the centre in both directions. Do not rely only on the pattern size because borders, seam allowances and pressing can change the final dimensions. Record the width and length without stretching the fabric.

For domestic-machine quilting, add at least 2 to 4 inches on every side to the batting. For longarm quilting, follow the quilter’s loading requirement; many request approximately 4 inches per side. A 60 × 72-inch top with four inches of allowance needs batting at least 68 × 80 inches.

Compare common batting fibres

• Cotton: breathable, stable and traditionally crinkled after washing.
• Polyester: light, resilient and available in higher lofts.
• Cotton-poly blend: balances natural feel with easier handling.
• Wool: warm, breathable and excellent for visible quilting texture.
• Bamboo or plant blends: soft and fluid, though care instructions vary.

Choose loft for the intended finish

Low-loft batting produces a flatter quilt and is usually easier to feed through a domestic machine. Medium or high loft gives stronger stitch definition but can make dense designs harder to manage. Check the package for minimum quilting distance so unquilted areas do not exceed the manufacturer’s limit.

Prewashing and joining

Follow the manufacturer’s instructions rather than assuming every batting can be prewashed. If joining remnants, place straight edges together and use batting-joining tape or a wide zigzag stitch. Avoid overlapping the pieces because the ridge may remain visible.

Final buying check

Confirm the packaged size after adding the required allowance. Batting must cover the entire quilt top throughout quilting, and the backing should normally be at least as large as the batting. When in doubt, ask the longarm quilter before cutting.