Editorial policy

Quality standards

• Every calculator explains units, assumptions, and rounding behavior.
• We prefer practical guidance (how to measure, what to round up, common misses) over generic filler.
• We avoid copying from other sites and focus on clear, original explanations that match the calculator logic.
• We continuously improve pages based on real user questions and search intent.

Updates

We update content when formulas change, packaging conventions change, or we find clearer ways to explain assumptions.

• Major pages include a 'Last updated' note.
• We may adjust default values to reflect common practice, but you can override inputs.
• For critical projects, always confirm with local code and product specs.

How calculators are built

We start with common takeoff formulas (like area × thickness = volume), typical coverage ranges, and packaging conventions (bags, boxes, bundles).

Before publishing, we sanity-check results with sample inputs and make sure outputs match how materials are actually purchased (whole units, minimums, and rounding up).

Corrections

If you spot an issue, email us with the page URL and what you believe is wrong, including your product or local context if relevant.

We prioritize corrections that affect safety, code compliance, or large material/cost differences.

Advertising & editorial independence

• Ads may help fund hosting and ongoing maintenance, but advertisers do not review or approve calculator logic or content.
• Defaults are chosen for common planning scenarios. We do not recommend specific brands or suppliers.
• If we add sponsored content in the future, it will be clearly labeled.

Sources and assumptions

• Manufacturer labels for coverage, yield, and installation constraints.
• Common trade conventions (roofing squares, sheet sizes, concrete bag yields, and typical waste factors).
• Local codes and supplier rules vary, so confirm requirements for your specific project.

Our content is informational and intended for planning. It is not professional advice. Validate assumptions with product documentation, local code, and qualified professionals when needed.