Cutting Chart for Disappearing Blocks

a series of disappearing hourglass quilts

Disappearing 4-Patch, Disappearing Hourglass, and Disappearing Pinwheel Blocks are similar in that they start with either 4 squares of fabric or 4 Half Square Triangles (HSTs). The 4 Pieces are sewn together then cut into 9 sub-blocks. The charts below tell you what starting size fabric squares, or HST’s, to use and how to cut them. All of these blocks will work when cut into exact thirds. This results in all of the sub-blocks being perfectly square. The second chart is for the blocks that I will label as “Charm Pack Friendly”
I also have a series of newsletters with free disappearing block designs and their associated quilts. 

Disappearing Block Sizes
Initial Square or
Half Square Triangle
4Patch, Hourglass,
or Pinwheel
Before Cutting
How far to cut
from center seam
Finished Block
2 1/2″4 1/2″3/4″3″
3 1/4″61″4 1/2′
4″7 1/2″1 1/4″6″
4 3/4″9″1 1/2″7 1/2″
5 1/2″10 1/2″1 3/4″9″
6 1/4″12″2″10 1/2″
7″13 1/2″2 1/4″12″
7 3/4″15″2 1/2″13 1/2″
8 1/2″16 1/2″2 3/4″15″
9 1/4″18″3″16 1/2″
10″19 1/2″3 3/4″18″

The sizes below are for the initial squares or the sewn HST’s. The squares of fabric for the Half Square Triangles will need to be cut 1/2″ larger. For example for 5 1/2″ HST, you would cut the squares 6″, sew them into triangles and then trim to 5 1/2″


A few of the Disappearing Block designs do not need to be cut into perfect squares. I am calling these blocks “Charm Pack Friendly” and that will be noted on all the appropriate patterns. I have two sizes, 5″ for using charm pack squares and 4 1/2″ for when charm pack squares are used to create Half Square Triangles.

Charm Pack Friendly Blocks
Initial Square or
Half Square Triangle
4Patch, Hourglass,
or Pinwheel
Before Cutting
How far to cut
from center seam
Finished Block
4 1/2″8 1/2″1 3/8″7″
5″9 1/2″1 5/8″8″

3 Replies to “Cutting Chart for Disappearing Blocks”

    • Hi Jackie,

      That is a very good question. I hadn’t thought about “Disappearing Jelly Roll” patterns, but the idea is very intriguing. I don’t have anything right now, but it is definitely going on my To-Explore list.

      Thanks for the inspiration,
      Brita

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