1. What is the Quilt Backing Calculation?

The quilt backing calculation determines how much fabric you need for the back of your quilt, accounting for the quilt's dimensions, desired overhang, and the number of fabric widths needed.

2. How Does the Calculator Work?

The calculator uses the backing yardage formula:

Where:

• Quilt length — The longest dimension of your quilt top (inches)
• Overhang — Extra fabric needed around the edges (typically 4-8 inches)
• Widths — Number of fabric widths needed to cover the quilt width
• 36 — Conversion factor from inches to yards

Explanation: The equation calculates how many yards of backing fabric you need based on your quilt dimensions and desired overhang.

3. Importance of Backing Yardage

Details: Accurate backing calculation ensures you purchase enough fabric for your quilt while minimizing waste. Proper backing allows for quilting and finishing.

4. Using the Calculator

Tips: Measure your quilt top carefully. Standard overhang is typically 4-8 inches (2-4 inches per side). For wide-back fabrics, use 1 width.

5. Frequently Asked Questions (FAQ)

Q1: How much overhang should I use?
A: Typically 4-8 inches total (2-4 inches per side) to ensure proper coverage for quilting and finishing.

Q2: How do I determine the number of widths?
A: Divide your quilt width by the fabric width (usually 42-44" for quilting cotton), then round up.

Q3: What if I'm using wide-back fabric?
A: Wide-back fabrics (typically 108" wide) usually require just 1 width unless your quilt is very large.

Q4: Should I add extra for shrinkage?
A: If prewashing, no extra needed. If not prewashing, consider adding 3-5% for cotton fabrics.

Q5: How do I join backing fabric?
A: Seam allowances should be 1/2" pressed open, with the seam running horizontally for longarm quilting.