Contact Us
This site is built and maintained by one independent developer, so email reaches a person rather than a ticket queue. Corrections, bug reports, tool suggestions and business enquiries all go to the same address.
We aim to respond within 48 hours. There is no contact form on this page deliberately — a form would mean running a server to receive submissions, and the entire site is static precisely so that there is no server holding anything.
Reporting something that is wrong
This is the most useful message you can send. Every calculator here states the formula it uses and cites its source, which means an error is checkable — and fixable. If a number looks wrong, a citation is dead, or a tool contradicts a source you trust, say so and it gets corrected. Include the tool name and what you expected, and a link to the source you are working from if you have one.
Suggest a Tool
Have an idea for a tool you would like us to build? We are always looking to expand our collection. Email us with:
- What the tool should do
- Why it would be useful
- Any similar tools you have seen (optional)
Report a Bug
If you encounter any issues with our tools, please let us know. Include the following details:
- Which tool you were using
- What you expected to happen
- What actually happened
- Your browser and device
Business Inquiries
For partnerships, advertising questions or anything commercial, use the same address: contact@onlinetoolhubs.com. The site is funded by advertising and nothing else — there is no sponsored content, no paid tool placement and no affiliate linking, and enquiries proposing any of those will be declined.
What we cannot help with
These are general-purpose tools, and there are limits to what a message here can do. We cannot give medical, legal, financial or tax advice, or interpret a result for your individual circumstances — the health and finance calculators apply published formulas and cannot account for your situation. We also cannot recover data from a tool you have already closed: nothing is stored, so there is no copy anywhere to retrieve.