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Set in and Corner Triangle Calculator

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.

Choose a calculator Backing and Batting Binding Border Die Cut Letter Fabric Measurement Conversion Piece Count Pieces to Yardage Area Project Cost Sashing Set in and Corner Triangle Shape Slit N Sew Fabric Calculator Square in a Square Strip Width of Fabric Yardage Conversion CutRiteTM Holiday Scrap Happy Bag 40 or more curated 100% cotton fabric strips 50 inches in length and 2-4 inches wide (including selvage). The best holiday strip scrap bag value available on the market! Non-holiday scrap happy bags available, too!

Enter the length of the finished square's side in inches     Size of square to cut in inches for:   Unfinished Set In Triangle =      Unfinished Corner Triangle =

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 January 31, 2023 Copyright ©  2023  Quilter's Paradise.  All rights reserved. Please report any web site comments or problems via our Contact Us page.

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