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Found a number that looks wrong? Tell me what you entered and what you expected, and I will check it against the published sources. Reports from quilters are how this site stays honest.

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What happens next

Reports are re-run by hand against the method the page documents. If the calculator is wrong, it is fixed and the worked examples regenerated; if the method itself needs a second look, the sources are re-read first. Either way, thank you — a wrong yardage figure costs somebody real fabric, and catching one is a genuine contribution to every quilter who uses the tool after you.