joe'smom

For larger HSTs, I like the Easy Angle Ruler; for sizes less than 3", I use the paper sheets from Quilting and Whatnot:

http://quiltingandwhatnot.ca/Half-Square-Triangle.html

sewbizgirl

I cut them from strips with the Easy Angle ruler. They are just about foolproof that way. Very little trimming needed, if any.

Mkotch

For smaller HSTs, I use the Easy Angle ruler or some of the other methods mentioned. However, for 5" unfinished, I think I would cut squares 6", then slice in half diagonally and sew them the old fashioned way, trimming as necessary.

Macybaby

if they are all the same color combo, I'd cut strips of 5" wide fabric, lay them right sides together and cut triangles with my EZ angle ruler, and sew. I do this method with anything about 2.5" UF or larger. If I need something smaller, then I'll cut a bit larger and trim.

I think my EZ angle ruler is one of my favorites. I tried doing some of "X at a time" methods and just can't get them to work out as well as I'd like.

pocoellie

There's also the grid pattern way, which I use when I have a lot of hsts to do.

Sharon100

I use Thangles

Doggramma

I like Thangles if I don’t mind having so many with just 2 fabrics. Otherwise I cut oversize squares, cut in half diagonally, pair a half with another half piece, sew, then trim down to the correct size.

Kitsie

Thanks for reminding me, pocoellie!

Onebyone

https://www.quiltineering.com/hst-tu...p-tube-method/

I went to a class and we did this way. You don't need a special ruler. It's great if you need a lot of hsts with no fussing.

SusieQOH

So many good methods. I really like this one! Will give it a go.