The block is now a perfect 19 ½″ square. Small – 4 ½″ block. Using a small ruler such as a 6 ½″ or 5 ½″ square repeat the same process above to square off this small block. Make sure to line up the diagonal line of the ruler from the bottom

To calculate where to place the ruler for any size quilt block, you divide the desired square size by 2, so 12 1/2 divided by 2 = 6 1/4. Using a rotary cutter, cut on the two sides of the ruler. Unfold the freezer paper and you have created a 12 1/2″ sq

An Easy Way to Square Up Quilt Blocks If pressing the block again doesn't work, or if the patches on the outer edges of the block are a bit skewed or uneven, use freezer paper to prep the block for sewing.