Contact
Last updated: August 17, 2026
We read every message. Whether you found a bug, want a new calculator, or have a business question, the best way to reach China–US Business Tools is by email.
General enquiries
Email us at contact@cnuscalc.com. This is the fastest way to get a response.
Feedback and corrections
If a calculator produced a result you believe is wrong, tell us what you entered and what you expected. Specific details help us fix things quickly.
Tool suggestions
We are expanding the toolkit. If there is a China–US trade calculation you do repeatedly by hand, let us know — it may become the next tool.
Business and advertising
For partnership, sponsorship, or advertising enquiries, use the same email. Note that advertisement slots on the site are currently placeholders; no ad network is connected yet.
Response time
We aim to reply within a few business days. This is a best effort rather than a guaranteed service level, and we appreciate your patience during busy periods.
A note on privacy
Please do not send sensitive personal or financial information by email. The calculators themselves run in your browser and the inputs you enter are never transmitted to us.