Contact & corrections.

Report a calculation or source issue

Include the calculator URL, the inputs you used, what you expected, and a primary-source link when reporting a rule change. Remove personal or confidential information from any shared URL or attachment.

Email jonas@sport-calculator.com.

Professional review

CPA/EA, landlord-law, broker/title and surveying review are pending. A reviewer will be identified only after their credentials and review scope have been confirmed. Editorial status remains visible on every tool.