Blocks You Can Make from Triangle Squares: A Simple Unit with Many Options

How is it possible for Triangle-Squares, also called Half-Square Triangles (or HST), to be one of the most popular units used in quilt designs? Well, there are many reasons! Perhaps most important of all: Triangle-Squares are easy to assemble. And there are tons of blocks you can make from triangle squares!

Sew Many Options

Whether you piece them with individually cut triangles…

Follow our Quick-Pieced Triangle-Squares technique to construct the units 2-at-a-time from squares…

Or speed up the process by making them 8-at-a-time,

…you have a lot of options!

More Possibilities

You can also easily assemble Triangle-Squares in a myriad of sizes—if you know a little math. (More on that in a bit.) Plus, with tons of tools to assist you in the assembly, you can’t go wrong! If you like foundation piecing, there are a variety of papers to help you accurately piece the units.

You can find handy templates and rulers too numerous to count. And let’s not forget the die-cutting tools that churn out the triangles in a blink of the eye. Most importantly, the Triangle-Square is a versatile unit that can be used and arranged in multiple ways. You’ll find them in units, blocks, sashes, and borders. Check out this small sampling of blocks — each made with 16 Triangle-Square units.

Now…about that math thing. It’s really easier than you may think. Determine the size you would like your Triangle-Squares to finish in your quilt, then add 7/8” to that (or .875 on your handy calculator) and follow our Sew Easy Lesson for Quick-Pieced Triangle-Squares. For example, to ensure they finish at 4”, cut 4-7/8” squares.

Want to make Triangle-Squares 8-at-at-time? Start with 2 squares that are double the size of your desired finished unit plus 1-3/4”. To quickly make a 16” block, grab 2 sets of 2 contrasting 10” squares and trim each to 9-3/4”. Follow the step-by-step Sew Easy Lesson instructions for 8-at-a-Time Triangle-Squares. Once you try this technique, you’ll surely be hooked.

How Will You Play with Triangle Squares?

Refer to our block examples — or create your own design with a few twists and turns. Then stitch up some colorful Triangle-Squares. Sew much fun! Isn’t it time to test your Triangle-Square knowledge with a smart, new quilt? Be sure to share your triangle creations with us on Instagram, Facebook, or in the comments below.