Back to Block Library
Share
BeginnerFour-Patch Family
3×3 Quilt Top Repeater
Click any block to rotate it 90° and explore custom layouts.
Pinwheel
Four half-square triangles spinning around a central axis
Recolor Fabric Slots
Preset Palettes:
Block Anatomy & Specs
Grid Layout2x2
Standard Sizes6", 8", 10", 12"
Seams & Techniques:
Half-Square Triangles (HST)
Foundational Units Used:
History & Origins of the Pinwheel Block
Built from four half-square triangle units arranged in a spinning motion, the Pinwheel is a historic favorite that adds lively energy and diagonal movement to quilt tops.
Cutting & Piecing Guide (12" Finished Block)
Precise unit cut sizes and step-by-step piecing instructions.
Choose a finished block size
The cut measurements below update to match.
Piece Cut List
12" Finished BlockCut 4 HST units trimmed to 6.5" (using 2 squares 7" background, 2 squares 7" blade fabric).
All measurements include a standard ¼" seam allowance. Finished block size: 12".
Step-by-Step Visual Assembly
1
Piece 4 identical HST units.
2
Rotate HST units so blade triangles point inward in a rotational direction.
3
Sew top 2 HSTs into top row, bottom 2 into bottom row.
4
Join rows at center seam and pin-spin center point flat.