Contact

General inquiries

Questions about the project, partnership opportunities or general feedback about the site.

Calculation errors

This is the highest-priority category. Include:

The tool name and URL.
The inputs you entered.
The result the tool gave you.
The result you expected and why — with a reference or source if possible.

Corrections to calculation engines are addressed before new tools are published.

Content corrections

If a formula explanation, assumption, limitation, FAQ answer or reference on a tool page is wrong or unclear, include the page URL and the specific claim.

Tool suggestions

We build tools that solve real, recurring technical problems. If you suggest a tool, explain the problem it should solve and why existing tools — here or elsewhere — fall short. Suggestions backed by a concrete use case are far more likely to result in a published tool.

Technical problems

If something is broken — a calculator produces an error, a page does not load, a form does not work — include the page URL, your browser and device, and what happened.

Privacy requests

Access, correction, deletion, objection or consent questions — see the Privacy Policy for your rights. We don't retain databases of personal data, so most requests concern data held by hosting or advertising providers, and we'll help route them appropriately.

Accessibility problems

See the Accessibility statement — accessibility issues are prioritized alongside calculation errors.

What we don't offer

Engineering consultation, project review or code-compliance sign-off — the tools and content are for reference only (see the Disclaimer).
Paid placements inside tools; results are never influenced by advertisers (see the Advertising Disclosure).

We usually reply within 2–3 business days.