Half Square Triangle (HST) Calculator
Determine the cutting size of squares to create half-square triangle units for quilting.
Input Parameters
Enter details for calculation.
Cut Square Size
Expert Tip
For the 2-at-a-time method, add exactly 7/8 inch (0.875") to the finished unit size to account for seam allowances.
Calculation Methodology & Details
Formula
Compensates mathematically for diagonal seam consumption and raw edge trim boundaries.
Important Disclaimer
The calculations provided are for educational and general informational purposes only. They do not replace professional advice or diagnostic validation. Always consult a qualified specialist.
How HST Cuts are Calculated
Follow these steps to complete the calculation:
Select Finished Size
Input the desired final size of the HST square in the quilt.
Choose Cutting Method
Use 2-at-a-time for scraps, or 8-at-a-time for large repeat blocks.
Related Tools
Detailed Insights & Expert Guide
ℹ️ About this Calculation
This calculator assists in performing size conversions and material estimations for Half Square Triangle. Easily find your correct fit or calculate exact yardage for your next sewing project.
Variable Glossary
Measurement / Dimension
The primary body measurement or fabric dimension in inches or centimeters.
Ease / Allowance
Optional ease added for fitting comfort or seam allowances.
How to Calculate Step-by-Step
Step 1
Take accurate body or project measurements using a flexible tape measure.
Step 2
Enter the values into the designated input fields.
Step 3
Check your calculated standard size, pattern requirements, or layout length.