3×3 Quilt Top Repeater
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Square-in-a-Square
Center focal square surrounded by four corner setting triangles
Recolor Fabric Slots
Block Anatomy & Specs
History & Origins of the Square-in-a-Square Block
Also known as the Economy Block, the Square-in-a-Square features a central square set on point framed by four right-angle triangles. It is popular for showcasing fussy-cut fabric prints or center hubs of complex medallions.
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
All measurements include a standard ¼" seam allowance. Finished block size: 12".
Step-by-Step Visual Assembly
Fold center square and corner triangles in half to crease center alignment points.
Sew two opposing corner triangles to opposite sides of center square. Press outward.
Sew remaining two corner triangles to top and bottom sides.
Trim outer square ensuring 1/4" seam allowance beyond center points.
Classic Quilt Blocks Built With Square-in-a-Square
The Square-in-a-Square unit is the core building block used in these traditional patterns: