How we worked it out
Updated as you change the numbers.
- Add the seam allowance to every edge, arrange the pieces in rows across the fabric width (tallest first), add up the row heights, and round up to the next 1/8 yard with 5% extra.
Method and assumptions
This is a simple layout, close to how you’d lay pieces out by hand. A cutting layout from a pattern, or careful nesting, can save some fabric; matching large prints needs more. Pre-wash cotton, which can shrink 3 to 5%.
Questions
How much fabric for four 18 in cushion covers?
About 2 1/4 yd of 42 in fabric: eight 19 in squares (front and back of each), two across the width in four rows.
Sources
Method and figures checked on . Every worked answer on this page is covered by an automated test. Found a mistake? Tell us.