Contact
Feedback, corrections, and suggestions are genuinely welcome — this site improves because people point out what's wrong or missing.
The fastest way to reach the site owner:
What to contact us about
- Corrections — if a formula, density figure, or explanation looks wrong, say so and it will be checked and fixed.
- Tool problems — a calculator misbehaving, an input that produces a nonsense result, a display issue on your device.
- Suggestions — materials, projects, or features you'd find useful. Suggestions are weighed against the site's focus on gravel and aggregate estimation.
- Privacy questions — anything about how the site handles data; see also the privacy policy.
A note on replies: this is a small independent site, and email is answered
as time allows rather than on a fixed schedule. Corrections to calculations get priority.
What not to send
Please don't send photos of documents, invoices, or anything containing personal details beyond what's needed to describe an issue. The calculators never need your real project data — a rough description works fine for reporting a bug.