Quilt Block: Jack in the Box Quilt Block Tutorial

jack in the box quilt block tutorial

This is our tutorial on how to make the Jack in the Box quilt block.  The instructions below are for a 10″ finished block” ( 10½” unfinished) but we have the fabric requirements for other sized blocks in the table at the end of this post.

What you need for a 10″ finished block

Main Fabric (white)

  • 8 pcs main fabric @ 3″ x 3″
  • 1 pc main fabric @ 2½” x 2½”

Contrast Fabric 1 (purple)

  • 4 pcs  @ 3″ x 3″
  • 4 pcs  @ 4½” x  2½”

Contrast Fabric 2 (black)

  • 4pcs of contrast 2 @ 3″ x 3″

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Tools Used in this Tutorial

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Method

We will start by making 8 half square triangles (HST).

  • Take one main piece of the main fabric and place it right sides together on one of the contrasting squares.
  • Do this for all 8 pieces of the main fabric.
  • Draw a line diagonally across each of the squares.

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  • Sew a ¼” seam on either side of the drawn line.

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  • Cut on the drawn line.

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  • This will give you 2 half square triangles (hst) from each 3″ square.
  • Press the seam to the dark side on each of hst.
  • Trim the hst’s to 2½”. If you are unsure on how to do this, here is a link to our tutorial.

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  • Lay the square out on the mat as shown in the photo below.
  • Place the rectangular pieces and the centre square in place.
  • We are going to work with the 4 squares in each corner.

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  • Place one square on top of the other, right sides together and pin.
  • Sew the squares together with a ¼” seam
  • Press the seam to one side

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  • Place the two squares in the second row one on top of the other, right sides together and pin.
  • Sew the squares together with a ¼” seam.
  • Press the seam in the opposite direction to the squares in the previous row.
  • Pressing the squares in opposite directions means the blocks will nest nicely when you come to sew them together.
  • Do the same for all four corner blocks.

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Now we need to join the blocks together into rows.

  • Place the first set of blocks on top of the rectangle, right sides together.
  • Sew together with a ¼” seam.
  • Place the last set of blocks in the row, on top of the rectangle, right sides together.
  • Sew together with a ¼” seam.
  • Do the same for the other two rows.
  • Press the seams open.

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  • Press the seams on the top and bottom rows in towards the rectangle.
  • Press the seams in the middle row out towards the edges.

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Now it’s time to join the rows.

  • Place the first row on top of the middle row, right sides together.
  • Make sure the rectangle pieces line up nicely with the centre square. As we have pressed the seams in opposite directions this will help you line these piece up.
  • Sew together with a ¼” seam.
  • And repeat for the last row.

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Your Jack in the Box quilt block is now finished.

I have made 4 of these blocks in contrasting colours and will probably add sashing and turn them into either a table runner or cushion cover.

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Fabric Requirements for Different Sized Blocks

Finished SizeFabric 1 (White)Fabric 2 (Purple)Fabric 3 (Black)
6"8 @ 2 1/4" x 2 1/4"
1 @ 1 11/16" x 1 11/16"
4 @ 2 1/4" x 2 1/4"
4 @ 2 7/8" x 1 11/16"
4 @ 2 1/4" x 2 1/4"
8"8 @ 2 3/4" x 2 3/4"
1 @ 2 1/8" x 2 1/8"
4 @ 2 3/4" x 2 3/4"
4 @ 3 11/16" x 2 1/8"
4 @ 2 3/4" x 2 3/4"
10"8 @ 3" x 3"
1 @ 2 1/2" x 2 1/2"
4 @ 3" x 3"
4 @ 4 1/2" x 2 1/2"
4 @ 3" x 3"
12"8 @ 3 1/2" x 3 1/2"
[email protected] 2 7/8" x 2 7/8"
4 @ 3 1/2" x 3 1/2"
4 @ 5 5/16" x 2 7/8"
4 @ 3 1/2" x 3 1/2"