The pattern says 3 yards at 45". Your fabric is 60".
The width-ratio conversion behind every chart, for any two widths, rounded UP to the cut your shop sells — and honest about the one case the ratio can't fix. Everything stays in your browser.
The conversion
The numbers here are yours to check. This page does arithmetic on what you type — it cannot see your recipe, your equipment or your batch.
Want it to remember?
In MadeKeeper your fabric is inventory by the yard: every cut project consumes its real yardage at its real cost, and the finished piece knows what the cloth in it cost. See for sewists & makers or poke around the live demo. $19/mo for the whole back office, kept for as long as you stay. The shop stays free for cost a piece and one fair — no product cap. The tax packet, Etsy and Square, and more fairs are the $19.
The conversion every pattern envelope assumes you know
Fabric width conversion is the arithmetic every sewist does in the aisle with a phone out. The math below is the same math the calculator runs — plus the honest caveats the charts bury.
How does the width conversion work?
By ratio: the same square inches of cloth, reorganized. Three yards of 45-inch fabric is the same area as 2.25 yards of 60-inch, so multiply the pattern's yardage by its width over yours. Every conversion chart ever printed encodes exactly this arithmetic for a handful of width pairs; this page does it for any pair, and rounds up to the cut your shop will actually make.
When does the ratio lie?
When a single pattern piece is wider than your fabric. A 50-inch-wide skirt panel cannot be cut from 45-inch cloth no matter what the total area says — cloth doesn't tile. The charts admit this in fine print; this page says it out loud: for garments with big pieces, do a test layout before buying. The ratio is the estimate. Your layout is the answer.
Why round up to an eighth?
Because that's the smallest cut most shops make, and rounding DOWN is how you end up half a sleeve short. An eighth of a yard is 4.5 inches — cheap insurance. Quarter-yard shops exist too, which is why the rounding is a setting rather than an assumption.
Does this account for nap, direction, or shrinkage?
No, and honestly: a one-way print or napped fabric (velvet, corduroy) needs all pieces running the same direction, which costs extra yardage the ratio can't see — patterns usually print a separate 'with nap' yardage; convert that one. Pre-wash shrinkage is its own step: buy for it, wash before cutting.