Contact Numbivo
Use this page to report a calculator or content problem, suggest an improvement, ask about privacy, or contact the operator about Numbivo.
Please use a subject that identifies the page or type of request. Do not send sensitive personal information that is not necessary for the issue you are reporting.
Report a calculator error
If a calculator result appears wrong, include enough information to reproduce the problem. The most useful report contains the page URL, the values and units entered, the result shown, and the result you expected or the method you used for comparison.
If the problem concerns a saved result, copying, printing, reset behaviour or a mobile layout issue, describe the action that caused the problem and the browser or device type where it occurred. Screenshots can help when the issue is visual, but avoid including private account, payment or identity information.
Report a content or reference issue
If you find an unclear explanation, broken link, unit problem, outdated reference or a mismatch between the English and German versions, please identify the exact page and section. When the issue concerns a technical value, regulation, manufacturer specification or another source-dependent claim, include the source you believe should be checked if you have it.
General limitations of calculators, Guides and Tables are described in the Calculator & Content Disclaimer. Information about how Numbivo prepares and reviews content is available on About Numbivo.
Privacy and data-protection requests
For privacy matters, use the same email address and put Privacy in the subject line so the request is easy to identify. Please do not include more personal data than is needed to explain the request.
Details about website analytics, advertising technologies, cookies and browser storage are provided in the Privacy Policy and Cookie & Browser Storage Policy.
Business and operator enquiries
For business, licensing, partnership or general operator enquiries, contact Numbivo at the email address above and briefly describe the purpose of the message. Advertising or commercial enquiries do not influence calculator formulas or editorial conclusions.
Formal operator information is available in the Legal Notice.