2.5" HST with 1/4" Seam
Finished Size of HST (inches): 2.5 inches; Seam Allowance: 1/4 inch
Cut Size of Squares (inches): 3.25 inches
Half Square Triangle Calculator
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Calculates the finished and cut sizes for half-square triangles (HSTs) used in quilting.
How To Use
How to use this calculator
Start with your values, or try a preset.
Step 1
Enter Finished Size of HST (inches) and Seam Allowance in the units shown.
Step 2
Read Cut Size of Squares (inches) in the results panel. Results update as you change the inputs.
Step 3
Choose a preset to load an example, then adjust the values for your situation.
Worked Examples
Example calculations
See the inputs and their calculated results.
3" HST with 1/4" Seam
Finished Size of HST (inches): 3 inches; Seam Allowance: 1/4 inch
Cut Size of Squares (inches): 3.75 inches
4" HST with 1/4" Seam
Finished Size of HST (inches): 4 inches; Seam Allowance: 1/4 inch
Cut Size of Squares (inches): 4.75 inches
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