Last week I covered fabric grains: lengthwise, crosswise and bias. I also covered bias seams when making units from the stitch & flip technique, like flying geese. This week I am covering another very familiar unit, the half-square triangle (HST) square. I cover the basic technique of making two at a time to making multiples. Let’s get started.
Making Half-Square Triangle (HST) Squares
Let’s start with the most basic, common method that makes two HSTs at a time and uses two squares cut 7/8″ larger than the finished measurement (the measurement without seam allowance) of your HST. For example, for a 2″ HST, you would cut each of the squares 2 7/8″.
Next, draw a line diagonally on the wrong side of one of the squares, place the squares right sides together and then sew a scant 1/4″ on each side of the drawn line.



Then, you cut the unit apart on the drawn line and press the two parts open for two HSTs!



Lots of Half-square Triangle Squares!
On no! I know you’ve shuddered at quilts that have a lot of these types of block units. Making them two at a time, like above, will take a long time. Because of that, you may shy away from making a quilt like my Village Square quilt.
If you want to make a quilt pattern like mine with a lot of scrappy HSTs, the technique of making multiple HSTs at once is a skill you want to learn. There is a way to make four HSTs at a time or even eight at a time.
Four HSTs at a Time: To start, you need to know the size of the HST you want to end up with to know what size to cut your fabric pieces for this technique.
If you need your HSTs to measure 2 1/2 x 2 1/2″ (that includes the seam allowance), you divide that number by .64 and then round up to the nearest whole number. Here’s how that formula looks in action:
2 1/2 ÷ .64 = 3.906 – that number is then round that up to 4″
So, you will cut two squares each 4 x 4″ from the two different color fabrics you want for your HSTs. (first photo below), lay the two squares, right sides together, on top of each other and then stitch with a 1/4″ seam around the outside (last photo).



Since my thread doesn’t show too well on the above photo (finger is pointing to the seam), here’s a drawing of what it should look like:

The final step is to cut the unit apart as shown below and then press open the resulting units for four HSTs.




Since the size of the squares used here are rounded up to make these HSTs, they may need trimming to measure the size needed for the pattern you are making. Be sure to lay the 45 degree line of the ruler you are using for trimming on the diagonal seam for accuracy.
Eight HSTs at a Time: If the quilt pattern you are making has a large amount of HSTs made from the same color combinations, then the eight at a time method will be more efficient for you. Start with 2 squares that are each 2 times the size of the HST square you are making plus 1 3/4″. For an HST squares that measure 1 1/2 x 1 1/2″ , here is the calculation:
1 1/2″ x 2″ = 3″
3″ + 1 3/4″ = 4 3/4″
So, you need two squares each 4 3/4 x 4 3/4″.
Draw two diagonal lines on the wrong side of one of the squares (photo on the left below) and then place your squares right sides together like in the four HSTs at a time instructions above. Pin the unit and sew a scant 1/4″ on each side of each drawn lines (photo on right below).


Cut the unit apart into 4 squares and then cut each square apart on the drawn diagonal line. Once all the pieces are cut apart, then press open for your eight HSTs.




Now you can trim those HSTs to the size you need. Repeat as often as needed to get as many HSTs as you want using a variety of color prints to end up with enough scrappy HSTs to make a quilt like my Village Square.
Blocks Made from Stitch & Flip and HSTs
Here’s some blocks that combine stitch & flip units from last week and the HSTs from this week. Hopefully the tips shared last week and this week make it easier to make these.



That’s all for this week. Leave a comment or ask a question below and I will enter you into the drawing for my pattern, Sun Catcher:
The drawing will be on Monday, January 26th. Good luck! ***We have a winner! Congrats, Judy Kimber!***
Happy Quilting,
Deanne































































































































































































