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Four half-square triangles arranged to spin like a windmill — movement and energy from a simple unit
Also known as: Whirlwind
The Windmill block is the close cousin of the Pinwheel — four HSTs arranged so their points converge at the center, creating blades that appear to spin in the wind. A slight difference in HST rotation produces a completely different visual effect from the same simple unit.
| Fabric | Cut | For |
|---|---|---|
| Blades | 2 squares at 4⅞″ | blade squarespairs make 2 HSTs each — trim units to 4½″ |
| Background | 2 squares at 4⅞″ | background squarespairs make 2 HSTs each — trim units to 4½″ |
Four HSTs rotated a quarter turn each so the blades spin — same bones as a pinwheel, traditionally set with stronger value contrast.
The Windmill block has been known by many names across different American quilt traditions — Whirligig, Flying Bat, Water Wheel, and Four-X among them. Like the Pinwheel, it draws on the universal appeal of rotational motion in patchwork: the brain responds to implied movement with delight, even in a static textile object.
What distinguishes the Windmill from the Pinwheel is the direction the triangles point. In a Pinwheel, the diagonal seam runs consistently clockwise or counterclockwise around the center. In a Windmill, the triangles point outward from the center with their long edges meeting at the center — creating the distinct windmill-blade silhouette rather than the circular pinwheel shape.
The block was popular in 19th-century scrap quilts because it uses small, irregular pieces efficiently — two triangles per block, no waste. Modern quilters have embraced it for its graphic quality in high-contrast two-fabric quilts and for its versatility in scrappy multicolor arrangements.
Make four identical half-square triangle units. For a 6" finished Windmill block, cut squares at 3⅞" and make four 3" finished HSTs.
Lay four HSTs in a 2×2 grid. In the Windmill arrangement, the dark triangles all point toward the block center, with their points meeting at the middle intersection. This is different from the Pinwheel, where the dark triangles spin around the center.
Sew the top two HSTs together, then the bottom two. Press the top row seam to the right, bottom row seam to the left.
Sew the two rows together. Twirl the center seams to distribute bulk. Press flat.
Two-fabric Windmills (one background, one blade color) create the most graphic effect. For scrappy windmills, use a consistent background and vary only the blade fabric. A gradient of blade colors from one side of a quilt to the other — light blues to deep navy, or pale pink to deep burgundy — creates a beautiful ombré windmill quilt.
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Each blade is made from two smaller HSTs, creating eight blades instead of four.
Multiple Windmill blocks rotated and grouped to create larger spinning wheel secondary patterns.
NiftyFifty quilters have been swapping blocks like this one since 1997. Browse our historical archive or join a new swap.
Browse quilt swaps →Four half-square triangles arranged to spin — one of the most dynamic and beginner-friendly patterns
The most versatile unit in patchwork — master this and you can make hundreds of different quilt patterns
A classic directional unit with countless uses — from single-row borders to full chevron quilts
Real quilters, real deadlines. Here's what's open to join.
