Fabric Yardage Calculator
Your pattern lists yardage for one fabric width — here's how much to buy of a different width.
Why fabric width changes how much length you need
Pattern yardage is really a length measurement for one specific fabric width, because pieces are laid out side by side across that width before the pattern moves on to the next row. A wider bolt fits more pattern pieces per row, so you need less length overall to fit the same pieces. This calculator uses the standard proportional estimate patterns rely on: new yardage = old yardage × (old width ÷ new width).
This is an estimate, not a cutting layout
The proportional formula assumes pieces scale evenly across width, which is close enough for shopping but doesn't account for how oddly-shaped pieces actually nest together. If your pattern envelope already lists yardage for your specific fabric width, use that number directly — this calculator is for when your width isn't listed at all.
When to round up
Round the result up to the nearest 1/8 yard your fabric store sells, and add extra if your fabric has a directional print, nap, or large pattern repeat that needs matching — none of those are accounted for in a basic width conversion.