Hst Quilt Calculator

Finished HST Size (in inches):

The calculator helps quilters find fabric square sizes for Half Square Triangles (HSTs).

Enter finished HST size, click “Calculate”.

Results show square sizes for 2-at-a-time, 4-at-a-time, and 8-at-a-time methods.

What is Half Square Triangle in quilting?

In quilting, a half-square triangle (HST) is a unit made by stitching two right-angled triangles together to form a square.

There are several ways for making HSTs, including 2-at-a-time, 4-at-a-time, and 8-at-a-time, which make varying amounts of HST units at once.

HSTs are a frequent unit in quilting patterns and are exceedingly adaptable, serving as the foundation for many quilt pieces.

Here is how you can calculate the Quilt HSTs:

To calculate 2-at-a-time:

Square Size = Finished HST Size + 1

To find out 4-at-a-time
Square Size = (Finished HST Size + 0.5) * √2 + 0.5

To find out 8-at-a-time:
Square Size = Finished HST Size * 2 + 2

I’ve been in the printing business for 25 years. I love to share my experiences and knowledge.

We may earn a small commission if you purchase through our links at no extra cost to you. Read full disclosure