Fat Quarter Calculator

Find out exactly how many pieces you can cut from a fat quarter before you pick up the rotary cutter.

📖 How it works & FAQ

Piece width (in)

Piece height (in)

Fat quarter width (in)

Fat quarter height (in)

What a fat quarter actually gives you

A fat quarter is a quarter yard of fabric cut in a fatter, more usable shape: roughly 18 inches by 22 inches instead of the long, skinny 9-by-44 strip you get from a standard quarter yard. That squarer footprint is why quilters love them, because you can fussy-cut motifs and pull more usable blocks from a single piece. This calculator tiles your chosen piece size across that 18x22 rectangle and tells you how many you can cut, how the grid lays out, and how much fabric is left as scrap.

How the math works

The tool fits a grid of your piece width by piece height inside the fat quarter. It divides the fabric width by the piece width and rounds down to whole pieces (you cannot use a partial column), then does the same for the height, and multiplies. It also tests the piece rotated 90 degrees and keeps whichever orientation yields more pieces. The fabric-used percentage compares the total area of your cut pieces to the full 18x22, so you can see how much you are wasting.

How to use it

Enter the finished piece width and height you want to cut, in inches (include your seam allowance).
Leave the fat quarter size at 18 x 22, or adjust it if your fabric was cut differently.
Read the results row: total pieces, the cutting grid, and how much fabric you will use.
Nudge the piece size up or down to see how it changes your yield before you cut.

These results are planning estimates based on straight, edge-to-edge cuts and do not account for directional prints, selvage trim, or shrinkage.

FAQ

Why is a fat quarter 18x22 and not 9x44?: Both are a quarter yard by area. A fat quarter is cut by halving a half-yard, giving a wider, blockier shape that is far more useful for quilt pieces.
Should I add seam allowance to my piece size?: Yes. Enter the cut size including seam allowance (usually add 0.5 inch for a standard 1/4-inch seam on all sides) so the count matches real cutting.
Why does rotating the piece change the count?: Fabric width and height divide differently, so one orientation often leaves less waste. The calculator automatically picks the better layout for you.
My fabric measured smaller than 18x22. What do I enter?: Measure the usable area after trimming selvages and frayed edges, then type those numbers into the fat quarter fields for an accurate count.