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Questions, corrections and suggestions are welcome. Use the form below and you will get a reply by email.

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For calculation problems, include the values you entered, the result you saw and the result you expected.

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Reporting a calculation problem

To get a problem fixed quickly, please include:

  • the address (URL) of the page;
  • the exact values you entered and any options you chose;
  • the result you saw and the result you expected;
  • your browser and device, if the page did not work at all.

Suggestions

Ideas for new calculators, converters or reference pages are welcome. Suggestions are considered if they are useful to many people and fit the site’s scope — everyday math, money math, measurement, time and dates. The site does not add health, financial-advice or gambling tools.