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THE FEUTEX TOOLKIT

On-Point Quilt Setting Triangles

Size oversized corner and side setting squares from the finished block diagonal for an on-point quilt.

Crafts workspace● Runs in your browser
01 Your input
02 Your result
View or copy raw result data
FormulaCorner square side = block/Math.sqrt(2)+seam*(2+Math.sqrt(2))+trim; Side setting square side = block*Math.sqrt(2)+2*seam*(1+Math.sqrt(2))+trim
Sources and model references

Made for real tasks

  • Size oversized corner and side setting squares from the finished block diagonal for an on-point quilt.
  • Compare an alternative set of measurements without uploading personal data.
Explore step-by-step workflows →

Worked example

Inputs

Finished block side
20 cm
Seam allowance
0.7 cm
Extra trimming allowance
0.5 cm

Expected results

Corner square side
17.03208512 cm
Side setting square side
32.16417023 cm

Load the example in the workspace to reproduce these results. Display rounding does not change the underlying calculation.

How to use this tool

  1. Enter finished block side, seam allowance, and extra trimming allowance in the displayed units.
  2. Calculate and use each labeled result for on-point quilt setting triangles. Compare the result with a measured sample before committing materials.

Try this example

{
  "block": 20,
  "seam": 0.7,
  "trim": 0.5
}

Accuracy and scope

Exact ideal right-triangle seam-offset geometry plus your trimming allowance. Round cut sizes upward to practical ruler markings. Cut corner squares once diagonally and side squares on both diagonals; test one block before cutting all fabric.

Is my data uploaded?

This tool runs locally in your browser. Input and output are not sent to a processing server. Copy or download your result before leaving the page.