There are several ways to make them. Previously, I've shared the traditional HST method, and the 8 at a time method.

Today we'll cover how to make 4 at a time.

Half square triangles are a foundational unit in piece quilting. They are used in a variety of ways. Many quilt blocks use HST's, including the Jacob's Ladder, Shoo Fly, and Birds in the Air.

Half square triangles are a foundational unit in piece quilting. They are used in a variety of ways. Many quilt blocks use HST's, including the Jacob's Ladder, Shoo Fly, and Birds in the Air.

These particular HST's were used in a Churn Dash block.

# HALF SQUARE TRIANGLES - 4 AT A TIME

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## SUPPLIES NEEDED FOR QUILTING

- fabric
- thread
- rotary cutter / cutting mat / straight edge
- sewing machine
- sewing scissors
- pencil
- iron and ironing board
- square quilting rulers

- fabric
- thread
- rotary cutter / cutting mat / straight edge
- sewing machine
- sewing scissors
- pencil
- iron and ironing board
- square quilting rulers

## HALF SQUARE TRIANGLE CUTTING CHART

**The formula**for making these HST's is a little tricky and it's not exact.Begin with the trimmed size of HST that you want. This will include the seam allowance.

So if you would like a final size of 3 inches the trimmed size will be 3 1/2 inches.

Take the trimmed size and divide it by .64 3.5 ÷ .64 = 5.47

Now add 1/4 inch. 5.47 + .25 = 5.71

Now round up to the nearest quarter or eighth of an inch to make it easier = 5.75 or 5 3/4 inches.

Don't worry about doing all the math. I've done it for you for the most common square sizes.

Print out the chart below for easy reference.

Printable Cutting Chart for 4 HST's

To print out the chart, click on the ↑chart above↑ or the ↓link below.↓

Printable Cutting Chart for 4 HST's

My method is slightly different than most because I add the quarter inch.
I played around with several sized HST's just dividing by .64.

The results varied. Some sizes were exactly on. Some were too large and some were too small.

I decided that by adding 1/4 inch and then squaring up after they're made gave me much better results.

Cut two squares of fabric. Place them so that the right sides are together.

Sew the two squares together with a 1/4 inch seam allowance. Sew around all four sides of the square.

Using a straight edge, cut diagonally from corner to corner in both directions.

Open up the fabric and press the seam toward the darker color.

Square up the triangle to the exact size needed.

## HOW TO MAKE HST's - 4 at a time.

Begin by determining the size of fabric needed. Use the chart above to help with this.

Cut two squares of fabric. Place them so that the right sides are together.

Sew the two squares together with a 1/4 inch seam allowance. Sew around all four sides of the square.

Using a straight edge, cut diagonally from corner to corner in both directions.

Open up the fabric and press the seam toward the darker color.

Square up the triangle to the exact size needed.

Want to watch the video? ↓↓Click the link ↓↓

## MORE QUILTING TUTORIALS

Don't forget to pin it!!

Thanks for these tips. Getting ready to work on a quilt with lots of hst. but i noticed in the chart you show the formula as: Trimmed size x .64 + 1/4 inch. Shouldn't it be divided by .64?

ReplyDeleteYou are correct, I will get that corrected! Thanks!

DeleteYou can size up your HST in half the time if you size them BEFORE you iron them. Use your HST square up ruler or mark a regular ruler

ReplyDeletewith tape. Mark (for instance) 2 1/2" up both sides of the corner of your ruler then place the edge of your painter tape across the corner of

your ruler connecting the 2 1/2" mark Place the sewed line on your HST on the edge of the tape representing

the 2 1/2" finished HST and cut along both ends of your ruler. (or square up ruler.) you have cut both sides at the same time.