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Metric Conversion Tools is maintained by an independent developer. Email is the fastest way to reach the site owner:

What to write about

Corrections. A conversion factor, table value, or formula that looks wrong. Please include the page URL and the value you expected — accuracy reports are fixed with priority.
Converter requests. A unit pair you wanted that the site does not cover yet.
Privacy questions. Anything about analytics, advertising, or cookies described in the privacy policy.
Advertising and business inquiries. Questions about ads shown on the site.

Messages are usually answered within a few business days. There is no account system on this site, so there is no login or personal data to recover — if you are asking about data collected by Google Analytics or Google AdSense, the privacy policy explains what those services collect and how to opt out of personalized advertising.