This calculator determines the size of a square to cut to create
both unfinished Set In Triangles and unfinished Corner Triangles
given the size of the finished square to which these triangles correspond.
(Please note that Set In Triangles are sometimes called Quarter Square Triangles (QSTs)
and Corner Triangles are sometimes called Half Square Triangles (HSTs).)
For example, suppose the length of the side of the finished square is 5 inches. The calculator will determine that you will need to cut a square with sides whose length is 4 1/2 inches to make 2 unfinished Corner Triangles and a square with sides whose length is 8 3/8 inches to make 4 unfinished Set In Triangles.
This calculator is designed and copyrighted by Quilter's Paradise. It is available free to use strictly for non-commercial, personal purposes only. Quilter's Paradise makes no warranty or representation as to the calculator's quality, performance or accuracy, and, in no event, will be liable for any damages resulting from its use. When calculating the amount of fabric required, the calculators calculate what is needed given the information provided. The user of the calculator is responsibile for determining if they want to add additional "just in case" fabric to the calculation and, if so, how much. The user assumes the entire risk as to the calculator's quality, performance and accuracy.
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Web site last updated October 30, 2023
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