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Terms of use
Use these calculators as planning aids and verify the details that depend on your property, products, supplier, and local requirements.
Planning estimates
Calculator results are estimates based on the measurements, assumptions, and prices entered. They are not bids, guarantees, engineering documents, or instructions for a specific product or site.
Your responsibility
Verify measurements, product coverage, package sizes, waste needs, installation instructions, site conditions, and local building requirements before purchasing materials or starting work. Consult a qualified professional where structural, electrical, plumbing, safety, permit, or code questions apply.
Availability and accuracy
We work to keep formulas and examples clear and tested, but the site may contain errors or become temporarily unavailable. Features, formulas, and content may change as the tools improve.
Acceptable use
You may use the site for personal or professional project planning. Do not interfere with the service, attempt unauthorized access, or use automated traffic in a way that degrades access for others.
Updates
Continued use after published changes means the updated terms apply. These terms were last updated on September 18, 2026.