Contact
Questions about a calculator, a correction, or a suggestion? Send an email.
Reporting a problem
The fastest way to get a problem fixed is to include:
- the page address,
- the numbers you entered, including the material and bag size,
- the result you got and the result you expected.
What this address cannot do
This site cannot give project advice, such as the right depth for a particular driveway, the strength of a concrete mix, or whether a structure meets code. For that, ask your supplier, a licensed contractor, or your local building department. Please do not send personal or financial information by email.