HesapHanem

Fat Quarter Calculator

Enter your project's fabric area to find the fat quarters needed.

How it is calculated

The tool divides the fabric area your project needs by the area of one fat quarter, 18 × 22 = 396 square inches, and rounds up: fat quarters = ceil(area ÷ 396). It also reports the total coverage = fat quarters × 396 and the leftover = coverage − area, both in square inches. Area must be greater than zero. The calculation is on area alone: it does not know the shape of your pieces, seam allowances, fabric grain, directional prints or how many pieces fit across an 18 × 22 inch rectangle, so the leftover is theoretical and the real waste is usually larger.

Worked example

A baby quilt top is 36 × 42 inches, so the area is 36 × 42 = 1,512 sq in. One fat quarter covers 396 sq in. Divide: 1,512 ÷ 396 = 3.82, rounded up to 4. Coverage: 4 × 396 = 1,584 sq in. Leftover: 1,584 − 1,512 = 72 sq in. Result: 4 fat quarters.

Try this example →

Common mistakes

  • Entering the finished quilt size and forgetting seam allowances. Pieces are cut larger than they finish, so the area you enter should be the cut area, not the finished one.
  • Entering square feet or square centimetres. The tool works in square inches, and 10 sq ft is 1,440 sq in.
  • Assuming the leftover is usable. 72 sq in spread across several fat quarters is mostly scraps, and cutting 6-inch squares may leave gaps.
  • Treating a fat quarter as 9 × 44 inches. That is an ordinary quarter yard, which has the same area class but a long narrow shape.
  • Buying only the calculated number when the print is directional or needs matching. These need extra fabric.

About this calculator

A fat quarter is a quilting fabric cut roughly 18 inches by 22 inches (about 396 square inches) — a quarter yard cut into a more square-ish shape rather than a long, narrow strip, which makes it more useful for cutting patchwork pieces and appliqué shapes without waste.

This calculator takes the total fabric area your project needs and figures out how many fat quarters that requires, along with the total coverage they provide and the fabric left over. It’s a routine planning step for quilters and sewists shopping a fabric store or fat-quarter bundle before cutting begins, helping avoid both an expensive over-purchase and a mid-project trip back to the shop.

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Comments (1)

  • Editorial team

    Area is only the first filter, because pieces have to physically fit on an 18 by 22 inch rectangle. Take one hundred 6-inch squares: 3,600 sq in comes out as 10 fat quarters with 360 sq in spare, but only nine 6-inch squares fit on one (three across, three down), so you would need 12. The tool counts area alone. How do you plan cutting for small squares versus large templates?

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