Nine Patch Quilt Block Pattern

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How to Sew a Nine Patch Quilt Block

The Nine Patch quilt block is one of the most traditional and versatile designs in quilting — nine equal squares arranged in a 3×3 grid that can be combined in endless variations to create stunning quilts!

Materials Needed

• Fabric in at least three different colors or prints
• Sewing machine or needle and thread
• Ruler and fabric scissors
• Iron and ironing board
• Pins

Step-by-Step Instructions

1. Cut nine squares of fabric all the same size. For a standard nine patch block, cut each square 3" × 3". Mix colors or prints to create your desired pattern.
2. Arrange the squares into three rows of three, alternating fabrics to create a pattern.
3. Sew the first two squares in row one together, right sides facing, with a ¼" seam allowance. Backstitch at the beginning and end. Add the third square. Press seams to one side.
4. Repeat step 3 for rows two and three.
5. Sew rows one and two together, right sides facing, with a ¼" seam allowance. Add row three. Press seams to one side.
6. Trim any excess fabric and threads.
7. Press the block flat, making sure all seams are smooth.

Your Nine Patch quilt block is complete! Repeat to create more blocks and arrange them in different patterns to build your quilt.

Nine Patch Strip-Piecing Technique

The secret to a perfect nine patch is pressing seams so they butt together neatly when joined.

1. Cut 5 A squares and 4 B squares. Using chain piecing, join a B square to 3 of the A squares, right sides together, with a ¼" seam allowance.

2. Join the remaining A and B squares to these units using chain piecing, right sides together, with a ¼" seam allowance.

For the faster strip method, cut A and B strips, join into A/B/A and B/A/B units, and cut across the pre-joined strips to create the units needed:

Press all seams toward the dark fabric. Join the B/A/B units to your A/B/A units with butted seams, right sides together, with a ¼" seam allowance. As long as a block has an underlying 3×3 grid, this principle applies.

How to Resize Quilt Blocks

The first step in modifying any quilt block is to decide on your finished block size. You can base this on doubling a pattern, cutting it in half, or working with your available fabric.

Note: When working from a pattern's cutting instructions, remove the seam allowance before scaling. For example, if your pattern calls for 3½″ squares, subtract the seam allowance (½″), double the finished size (3″ → 6″), then add the seam allowance back (½″) — giving you a 6½″ cut piece.

Resizing Square Blocks

Add ½″ to your finished block measurement. For a 4″ finished square, cut a 4½″ square of fabric.

Resizing Rectangular Blocks

Add ½″ to both the length and width. To double a 3″ × 4″ block, cut a 6½″ × 8½″ rectangle.

Resizing Half-Square Triangle Blocks

Add 7/8″ to the desired finished block size. For a 4″ finished HST block, cut 4⅞″ squares.

Resizing Quarter Square Triangle Blocks

Add 1¼″ to the desired finished block size. For a 4″ finished block, cut 5¼″ squares.