Contact
Found a wrong number, a broken page or a product assumption that does not match reality? Send the details.
What to include
- The calculator page or URL.
- The dimensions and units you entered.
- The result you expected and why.
- A photo of the product label if the issue is bag yield or coverage.
Response time
Messages are usually reviewed within a few business days. Corrections that affect a published formula are prioritized.
Advertising and partnerships
For advertising, sponsorship or data partnerships, use the same email with “Partnership” in the subject line.
Privacy requests
For access or deletion requests under privacy law, see the privacy policy and email with “Privacy” in the subject line.