Contact
Spotted a wrong number, a broken calculator, or a project type we don't cover yet? Let us know.
When you write in, it helps to include
- The calculator's URL (the page you were on).
- The inputs you entered and the result you got.
- What you expected instead, and why, if it's a suspected error.
Reporting an error
We check bag yields, densities and block weights against manufacturer specifications — see our editorial standards — but if a number here doesn't match what you're seeing on a bag or a supplier's sheet, tell us. We'd rather fix it than have it sit wrong.