Contact

Questions about the tools, reports of calculation errors, suggestions for new features, partnerships, or requests concerning your personal data. We reply within 72 business hours, and within one month for data protection requests.

Your message is transmitted through Web3Forms, which acts as a processor on our behalf. We do not send promotional email and we do not add you to any mailing list.

Messages are retained only as long as needed to handle your enquiry, and no longer than 24 months. You may ask us to delete your message at any time.

Reporting a calculation error? Please include the tool used, the input values or a description of your dataset, the result you got and the result you expected, plus the software you compared against. Calculation corrections are treated as top priority.