Half-Square Triangle Tatting Motif: A Versatile Free Pattern

Two Triangles, One Beautiful Square

This charming design proves that some of the most striking tatting patterns come from the simplest structural ideas. What appears at first glance to be a single cohesive square is actually made up of two separate tatted triangles, joined along their diagonal edge to form a complete square motif. In this sample, one triangle is worked in warm shades of orange and rust while the other is done in a bright spring green, and the effect of pairing these two contrasting halves together is wonderfully eye-catching, with the diagonal color-block giving the finished piece a graphic, almost quilted look despite being entirely lace.

Playing With Color Combinations

Color choice plays a huge role in how dynamic this pattern can look, and this is really a design that invites experimentation. Because each triangle is worked separately, you have complete freedom to pair any two colors together, whether you want a bold contrast like the orange-and-green combination shown here, a subtle tonal pairing using two shades of the same color family, or even a fully scrappy approach using leftover thread from other projects. Since the two halves aren’t tatted as one continuous piece, you’re not locked into carrying a single color throughout, which makes this an excellent stash-busting pattern as well as a great way to test out color combinations before committing to a larger project.

Simple Stitches, Clean Construction

The construction technique itself relies on standard tatting fundamentals, using double stitches (ds), picots (p), and joins (j) throughout, worked with two shuttles or two needles depending on your preferred method. Because the pattern is broken into two individually worked triangles rather than one continuous round, it’s a great project for practicing clean joins and picot placement, and the two-triangle structure also means the piece is easier to keep track of as you work compared to patterns that require juggling many rounds simultaneously.

Endless Arrangement Possibilities

One of the most appealing aspects of this design is just how many ways the individual triangles can be recombined once you’ve made a few. Beyond simply joining two triangles into a square, you can arrange multiples of them into larger geometric patterns, alternate colors to create diagonal stripes across a finished piece, form pinwheel effects by rotating triangles around a central point, or piece them together into borders, coasters, or even larger lace panels. Because each triangle is a self-contained unit, the design possibilities are really limited only by your imagination and how many triangles you’re willing to tat.

A Note on Sizing

In terms of finished size, this pattern is fairly adaptable depending on your thread choice. Worked in a size 40 tatting thread, a single completed square motif measures approximately 2-3/8 inches square, making it a nice size for small embellishments. If you’d prefer a larger finished piece, switching to a heavier doily-weight thread such as size 10 will produce a noticeably bigger square, which might be preferable if you’re planning to join several motifs together into something like a table topper or larger decorative panel. Whichever thread weight you choose, the pattern includes both fully written instructions and an accompanying chart, so you can work through it in whichever format suits your tatting style best.