Using charm packs to make your half square triangles makes it easy to have a variety of fabrics without building a big stash. You can make several sizes of half square triangles (HSTs) from a charm pack by using the two-at-a-time, four-at-a-time or eight-at-a-time easy stitch and cut methods.
Charm packs are precut five inch (5″) squares of coordinating fabrics. They can be a collection of solid fabrics that have a theme, or highlight a line of fabrics by a particular designer. Charm packs generally have 42 squares that are 5″ square in each pack.
Charm Pack Half Square Triangles Cheatsheet
- Two at a time method: you’ll trim to 3-1/2″ and finished square is 3″, making 84 three-inch squares
- Four at a time method: you’ll trim to 2-1/2″ and finished square is 2″, making 168 two-inch squares
- Eight at a time method: you’ll trim to 1-1/2″ and finished square is 1″, making 336 one-inch squares
Charm Pack Half Square Triangles Two at a Time
You can make an easy quilt that looks spectacular by using two coordinating charm packs and turning them into half square triangles two at a time. If you only use charm packs, you don’t need to do a final trim to the squares as they will all be the same size.
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Half Square Triangles Four at a Time from Charm Packs
It’s super easy to make half square triangles (HSTs) four at a time from charm packs. See more about making HSTs 4 at a time. As I mention in the earlier article, 4 at a time is not my preferred method for making HSTs since the outside edges are on the bias.
Start by layering two charm pack 5″ squares together.
Sew all four sides with 1/4″ seam allowances. Cut diagonally in both directions. Here is the first cut:
Setting up for the second cut:
Here are the four half square triangles after cutting:
Just like the HSTs two at a time above, if you are making a quilt with only these blocks you can go ahead without trimming. If you are using these as part of a larger block, you will need to trim them to the sized needed for your block.
At this stage, they measure about 3-1/4″. I trimmed them to 2-1/2″ so they would work as a 2″ finished block size, which works for 4″, 6″, 8″, 10″ and 12″ block patterns.
Here are some layout options for four-at-a-time charm pack half square triangles.
Half Square Triangles Eight at a Time from Charm Packs
Start by marking one of the 5″ charm pack fabrics with diagonal lines.
Sew 1/4″ on each side of each of the diagonal lines. To see more, check out how to make half square triangles eight at a time.
Here is sewing the fourth seam.
Now it is time to cut the half square triangles. Cut along each of the lines, forming 4 pieces.
Then cut through the middle of each, forming eight pieces.
Here are all eight half square triangles cut, ready to press open and then trim.
If you are making a quilt with only these pieces, no need to trim.
If you are using these combined with other blocks, you’ll need to trim them. I trimmed them to 1-/12″ so they will be 1″ finished blocks.
Here are various ways to layout your eight half square triangles made from charm packs.