Questions and feedback
Contact
Found a confusing assumption, a calculation edge case, or a project tool that should exist? Useful feedback makes the whole catalog better.
Report a calculator issue
Include the calculator name, unit system, inputs, result you received, and what you expected. Please avoid sharing personal or property-identifying information.
Open a GitHub issueSuggest a calculator
Describe the project decision, required measurements, material package size, and the result a useful tool should produce. Specific, independently useful calculators are prioritized over near-duplicate keyword pages.
Before requesting project advice
We can improve the calculator and its explanation, but this site does not provide contractor quotes, structural advice, code interpretation, or product-specific installation approval.