A blog showcasing quilt patterns by Monica Curry. Get free patterns, quilting tutorials, and printables. Quilt patterns for every skill level are featured.

Tuesday, 23 February 2016

Make Perfect Pinwheels Every Time!

In this tutorial, I’ve illustrated instructions for making four Half Square Triangles (HST) needed for a pinwheel block. I also included the formula for creating any size pinwheel block you need.


make perfect pinwheel blocks

I love the pinwheel block. It’s a timeless classic that can easily be incorporated into traditional as well as modern style quilt designs, but piecing all those little triangles would be a pain. With new rotary cutting techniques, however, making quilt blocks has become quick and easy. The pinwheel block is no exception.

make perfect pinwheel blocks tutorial

Now grab your calculator. This is the formula for making any pinwheel size you want.

[NOTE: The finished size DOES NOT include 1/4 inch seam allowance.]
  1. Determine the finished block size you need, e.g. 4 inches.
  2. Divide the finished block size by 1.41 (4 ÷ 1.41 = 2.82). 
  3. Add that result to 0.875 (2.82 + 0.875 = 3.70 ).
  4. Now round up this result to the nearest ⅛ inch to get your parent size block, which in this example would be 3.75 or 3¾ inch. So, to make one 4" x 4" pinwheel, you need two 3¾ inch squares.
Here are some measurements already done for you:
    Formula For Making Pinwheel Quilt Blocks

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