Half Square Triangles or HST are squares made up of two right angle triangles, each triangle taking up half the square. HST are commonly used in quilt patterns and can be used to make some interesting designs.
There are several methods that can be used to make HST, including making 1, 2, 4 or 8 at a time etc.
Download your FREE copy of the HST Cheat Sheet. The cheat sheet includes a fabric cutting guide and step by step instructions for the 2, 4 and 8 at a time methods.
Which method should you use? Consider . . .
- How many HST needed for your project e.g. If you only need a couple, then the 2 at a time method may be best. If you need a lot, then 8 at a time might make more sense.
- Whether you are comfortable working with bias edges. The 4 at a time method creates edges that are along the bias. As a result, HST made with this method can be more prone to stretch.
When making HST:
- Be as accurate as you can with your cutting and piecing.
- When cutting fabric to make HST, round any measurements up to the nearest 1⁄4" e.g. round 1 7⁄8" up to 2". It is better to make slightly oversized units and trim them to size.
- Use a scant 1⁄4" seam when sewing.
- Trim the HST to the size needed. Use the 45° line on your quilting ruler by placing it along the sewn diagonal of the HST before trimming (For steps on trimming HST).
Use the links below to refer to details of how to make Half Square Triangles via the:
- 1 at a Time Method.
- 2 at a Time Method.
- 4 at a Time Method.
- 8 at a Time Method.
- And How to Trim HST.
Looking for quilt patterns that use Half Square Triangles, then check out the following patterns:
