12″ Pinwheel quilt block tutorial


12″ finished pinwheel block

click on photos to enlarge


  • peach (light):  (1) 7 1/4″ square
  • mango (dark):  (2) 5 1/8″ squares
  • emerald: (1) 7 1/4″ square; (4) 2 1/4″ x 6 7/8″ rectangles

Scant 1/4″ seam allowance.


mango 5 1/8″ square, cut in half on the diagonal


with corners trimmed off using From Marti Michell Corner Trimmer


Peach 7 1/4″ square; cut in half on the diagonal, twice.

Repeat with the 7 1/4″ emerald square.

All of the cut triangles (peach, mango, and emerald) should be the same size.  They are cut differently because you want the straight of grain on different edges of the triangles.


Pair a peach triangle with an emerald triangle.  Pin as shown and sew a straight seam.


Press open the seam.


This unit should measure 6 1/2″ unfinished.  Lay a square ruler on the unit with the 45 degree line running along the seam.  Trim if needed.


Pair a mango triangle with an emerald rectangle.  Pin as shown and sew a straight seam.


Press the seam open.  This unit should measure 6 1/2″ unfinished.  The 4 1/2″ line should run along the seam between the peach and emerald.  Trim if needed.  All of my units had some of the emerald rectangle that needed to be trimmed.


Place a 6″ x 12″ rotary ruler on top of this unit with the 45 degree angle line running along the left edge.  Trim the emerald rectangle to match the angle of the mango triangle.



Place the two units right-sides together.  Sew a straight seam and press the seam open.


6 1/2″ unfinished.  Make 4.


Arrange the units into a pinwheel layout.


Sew into rows.  Press seam towards the peach triangle.

Sew the rows together.  Press towards the peach triangle on each side of the center of the block.

Swirl press the center.

Happy Quilting!


3 thoughts on “12″ Pinwheel quilt block tutorial

  1. Hello. In your pinwheel design, you call for: (1) 5-1/8″ square to be cut from the mango color (dark). Then this square is to be cut into half.

    Don’t you need TWO of these 5-1/8″ squares so you end up with four mango triangles?

Leave a Reply

Your email address will not be published. Required fields are marked *