Enter Finished Size for Half Square Triangle Block (IN)
Fabric Sizes to Cut

2 at a Time Method  (How-to)
Cut squares 3 7/8 inches

4 at a Time Method  (How-to)
Cut squares 5 1/2 inches
 
Notes:

Calculated sizes are the minimum size squares to cut.

It is easier to use a slightly larger size square and trim any excess.