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Last updated: December 16, 2025

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For bug reports, include

  • The calculator name and page URL
  • The exact inputs you used
  • What result you expected vs what you got
  • Your device/browser (example: iPhone Safari, Chrome on Windows)

For new calculator requests, tell us

  • What you’re trying to calculate (the “job to be done”)
  • The minimum inputs you want
  • Any standards, formulas, or assumptions you prefer
  • Who it’s for (students, homeowners, investors, engineers, etc.)