Contact & corrections

For editorial corrections, questions about our sources, photograph permissions or website issues, email dinhminhfvuibien10904@gmail.com.

Reporting a correction

Include the page address, the passage you are asking about and, if available, a link to the relevant official rule or manufacturer instruction. This helps us identify the exact issue without confusing different match formats or product models.

Reporting a tool issue

Tell us which calculator or tool you used, the inputs you entered, the result shown and what you expected. Include the device or browser if the issue concerns layout or interaction. Do not send passwords, account credentials or sensitive personal details.

Permissions and privacy questions

For questions about text or photography, identify the page and material concerned. Our photography credits list the original image sources and licences. You can also use the email above for questions about the site’s privacy policy.

This site does not have a contact-form submission service. Selecting the email link opens your configured email application; you can also copy the address into your preferred email service.