Block Library
Four Patch
The simplest patchwork block: four equal squares arranged in a 2x2 grid. Two squares of one fabric and two of another create a classic checkerboard-style unit. A foundational block used on its own and as a building unit inside dozens of more complex blocks.
Why quilters love the Four Patch
- Perfect first block for any new quilter
- Uses only straight seams and squares
- Excellent scrap buster for small fabric pieces
- Builds into Ohio Star, Bear Paw, and many other blocks
- Works in any color combination or fabric style
Construction at a glance
What you'll work with
- Four equal squares
- Two colors or fabrics
- Straight seams only
- No triangles or bias edges
- No templates required
Four Patch blocks can be made by cutting individual squares or by using strip piecing: sew two long strips together, press, and subcut into pairs. Strip piecing is faster when making many blocks at once.
Common finished sizes
- 4"
- 6"
- 8"
- 12"
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Cutting guide
For a 6" Finished Block
- 2 squares from Fabric A at 3.5" × 3.5"
- 2 squares from Fabric B at 3.5" × 3.5"
Each square finishes at 3". The completed block should measure 6.5" × 6.5" unfinished.
Strip Piecing Option: Cut one strip from each fabric at 3.5" wide. Sew the strips together along one long edge, press, and subcut at 3.5" intervals to create pairs. Sew pairs together for a faster method when making multiple blocks.
Sizing formula: Finished square size + 0.5" = cut size
For a 6" block: 3" + 0.5" = 3.5" squares
- 4" block = 2.5" squares
- 6" block = 3.5" squares
- 8" block = 4.5" squares
- 12" block = 6.5" squares
How to sew the Four Patch
- 1
Pair one Fabric A square and one Fabric B square right sides together.
- 2
Sew along the right edge using a 1/4" seam allowance.
- 3
Press the seam toward the darker fabric.
- 4
Repeat with the remaining two squares to make a second pair.
- 5
Press this second pair in the opposite direction so seams will nest.
- 6
Place both pairs right sides together with opposite fabrics touching.
- 7
Check that center seams are nested and locked together.
- 8
Sew along the long edge.
- 9
Press the center seam open or to one side.
- 10
Check that the block measures 6.5" × 6.5" unfinished.
Accuracy tips
- Use a consistent 1/4" seam allowance on every seam
- Press each seam before adding the next piece
- Press the two pairs in opposite directions so the center seams nest
- Trim thread tails before pressing to keep the block flat
- Square up the finished block if needed before using it
Common mistakes
- Center Intersection Does Not Match
- The seams from each pair were pressed in the same direction instead of opposite directions, preventing them from nesting and locking together.
- Block Is Too Small
- Seam allowances wider than 1/4" reduce the finished size. Use a scant 1/4" seam and check the unfinished size after sewing.
- Block Looks Wavy or Puckered
- Seams were not pressed flat before joining, or the fabric was stretched while sewing. Press after every seam.
- Squares Are Not Even
- Cutting was slightly inaccurate. Use a rotary cutter and ruler against a self-healing mat for clean, consistent squares.
Fabric ideas
- High contrast light and dark for a bold checkerboard
- Two coordinating prints from the same fabric collection
- Scrappy assortments of many fabrics for a vintage look
- Solids in classic two-tone combinations
- Seasonal or holiday prints paired with a neutral
- Low-volume backgrounds with bold feature squares
Variations
- Double Four Patch (four Four Patches arranged in a larger 2x2 grid)
- Nine Patch with Four Patch alternating blocks
- Four Patch on point (rotated 45 degrees)
- Scrappy Four Patch (different fabric in every square)
- Giant Four Patch (whole quilt)
- Irish Chain (Four Patches in a repeating diagonal setting)
Related blocks
Browse all 9 classic quilt blocks with cutting guides and assembly instructions.
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