Standing at the cutting counter without knowing how much fabric to ask for is one of the most common beginner worries. Buy too little and you’re hunting for a matching dye lot; buy too much and the extra sits in a bin for years. The good news: yardage is just arithmetic, and once you know the three numbers that matter you can work it out for any project.
The three numbers that decide your yardage
- The size of each piece you’ll cut, including seam allowance.
- How many of each piece you need.
- The usable width of the fabric — which is less than the width printed on the bolt.
Everything else follows from how many pieces fit side by side across the fabric, and how many rows of them you need down its length.
Usable width is not bolt width
Quilting cotton is sold as 44” wide (some bolts say 42”–45”), apparel fabrics are often 54” or 60”. But the outer edges — the selvages — are tightly woven, often printed with the maker’s name, and shrink differently from the rest of the cloth. You cut them off.
Plan on losing about 1” of width to selvages: a 44” bolt gives you roughly 43” of fabric you can actually cut from.
If you pre-wash (and for quilting cottons and anything you’ll launder, you should), allow for a little shrinkage too — cotton commonly loses a few percent in length.
Worked example: twelve placemats
Say you’re cutting twelve placemat backs, each 14” × 19” including seam allowance, from 44” quilting cotton.
- Usable width: 44” − 1” = 43”.
- Pieces across the width: 43 ÷ 14 = 3.07, so 3 pieces fit side by side (the 19” side runs down the length).
- Rows needed: 12 ÷ 3 = 4 rows.
- Length: 4 × 19” = 76”, which is 2.11 yards.
Fabric is sold in eighths of a yard (4.5”), so round up to the next eighth: 2⅛ yards. If you’re pre-washing, buy 2¼ to be safe.
Try turning the pieces the other way, too — 19” across fits only 2 per row, which needs 6 rows of 14” = 84”. The first layout saves almost a quarter yard.
When the pattern says 44” and your fabric is 60”
Patterns list yardage for specific widths. If your fabric is wider (or narrower), don’t guess — the Fabric Width Converter rescales a pattern’s yardage from one width to another, so you can buy the right amount of that gorgeous 60” linen.
Let the calculator do it
The Fabric Yardage Calculator runs exactly the steps above: enter your piece size, quantity, and bolt width and it shows how many pieces fit across, how much length you need, and what to buy, rounded up to the nearest ⅛ yard (or 0.1 m).
Quick rules of thumb
- Directional prints and nap (velvet, corduroy, one-way designs) mean every piece must face the same way — you can’t rotate pieces to save fabric, so expect to need more.
- Matching plaids or stripes adds roughly one pattern repeat per major piece.
- Buy a little extra for your first try at a new pattern; a cutting mistake costs less than a second trip to the shop.