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Spotted a wrong number, an outdated citation, or a typo? Send the URL and the issue. We update verified errors within 14 days.
Email: contact@ge3.shop
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Have a question about a calculator, an article, or how to use the site? We answer every genuine question — usually within one business day.
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Email: contact@ge3.shop
Check the calculator first
Many questions are answered in the explainer article that ships with each calculator. Scroll past the form on any calculator page to read the methodology, the worked examples, and the footnotes.