StitchablesStitchablesCut sizes for 1:2 ratio HRTs
Calculate cut sizes and fabric yardage for half-rectangle triangles using the standard 1:2 ratio method. Each pair of rectangles yields 2 mirror-image HRTs.
The short dimension of the finished HRT
Auto-fills as width × 2 for standard 1:2 ratio
Usable width of fabric (typically 42″ for quilting cotton)
Mirror pairs. That's the thing that trips everyone up with HRTs. Unlike HSTs, you can't just rotate an HRT to change its direction — you need to cut lefts and rights separately. Before you cut your whole stack, sew a test pair and confirm the diagonal leans the right way. Mark your fabric clearly. This one mistake wastes more fabric than any other in quilting.
Use a shorter stitch length (1.5–1.8mm) on that long bias seam. The shallower diagonal means more bias exposure than an HST, and a standard 2.5mm stitch won't hold it stable during pressing. Chain piece to minimize handling — the less you pick up and put down each unit, the less the bias stretches.
Starch is your best friend here. Heavy starch before cutting, not after. These units have more bias per square inch than almost any other patchwork shape, and unstabilized fabric will fight you at every step. Trim every unit to exact size with a ruler, and draw your sewing line — don't eyeball the diagonal on a rectangle.
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