Windmill Quilt Block
Four half-square triangles arranged to spin like a windmill — movement and energy from a simple unit
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.
History & Background
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.
Step-by-Step Instructions
Make four HSTs
Make four identical half-square triangle units. For a 6" finished Windmill block, cut squares at 3⅞" and make four 3" finished HSTs.
Arrange in the windmill orientation
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 into two rows
Sew the top two HSTs together, then the bottom two. Press the top row seam to the right, bottom row seam to the left.
Join rows
Sew the two rows together. Twirl the center seams to distribute bulk. Press flat.
Tips & Techniques
- The difference between Windmill and Pinwheel is one step: in the Windmill, the dark triangles point in toward the center; in the Pinwheel, they spin around the center. Lay out carefully before sewing.
- Strong contrast is essential — the windmill blades disappear if light and dark are too similar.
- Works beautifully with the 8-at-a-time HST method since you need many identical HSTs.
Color & Fabric Selection
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.
Variations & Related Patterns
Double Windmill
Each blade is made from two smaller HSTs, creating eight blades instead of four.
Spinning Wheels
Multiple Windmill blocks rotated and grouped to create larger spinning wheel secondary patterns.
Quick Facts
Put it to use
NiftyFifty quilters have been swapping blocks like this one since 1997. Browse our historical archive or join a new swap.
Browse quilt swaps →Related Guides
Pinwheel Quilt Block
BeginnerFour half-square triangles arranged to spin — one of the most dynamic and beginner-friendly patterns
Half-Square Triangle (HST) Quilt Block
BeginnerThe most versatile unit in patchwork — master this and you can make hundreds of different quilt patterns
Flying Geese Quilt Block
BeginnerA classic directional unit with countless uses — from single-row borders to full chevron quilts