Renovate Cafe provides free home-improvement calculators and how-to guides for general informational and educational purposes only. Please read this disclaimer before relying on anything here.
General information, not professional advice
Nothing on Renovate Cafe is professional, engineering, structural, electrical, plumbing, or construction advice, and using the site does not create any professional relationship. Our content is no substitute for the judgment of a licensed contractor, architect, engineer, or your local building department. When a mistake could be dangerous, expensive, or against code, consult a qualified professional.
Calculators give estimates
Our calculators are planning aids that produce approximate quantities, not exact figures. Results depend entirely on the numbers you enter and on assumptions — material yields, coverage rates, waste factors, and standard sizes — that vary by brand, product, region, and site conditions. Real projects have obstructions, irregular shapes, slope, settling, breakage, and offcuts that a simple calculator cannot see.
Always:
- Measure carefully, and double-check your own inputs.
- Confirm coverage and yield against the figures printed on the actual product you buy.
- Order a sensible margin of extra material, and keep your receipts so you can return the surplus.
- Verify quantities and methods with your supplier or a professional before a large or irreversible purchase or pour.
Safety is your responsibility
Home-improvement work involves real hazards — power tools, ladders and heights, heavy materials, dust and silica, caustic and toxic substances, electricity, and gas. Our guides may mention common precautions, but they are not a complete safety manual. You are responsible for working safely: use appropriate personal protective equipment, follow every tool and product manufacturer's instructions and safety data sheets, and stop and hire a professional for any task beyond your skill, tools, or comfort — especially roofing, structural, electrical, gas, and anything at height.
Codes, permits, and utilities
Building codes, zoning rules, and permit requirements vary by location and change over time. It is your responsibility to confirm and comply with the rules where you live, to obtain any required permits and inspections, and to call 811 (or your local utility-locating service) before any digging. Following one of our guides does not guarantee that your project meets local code.
No warranties
Renovate Cafe is provided "as is" and "as available," without warranties of any kind, express or implied, including accuracy, completeness, fitness for a particular purpose, or non-infringement. We work hard to keep the math and information correct and we test our formulas, but we do not warrant that the site is error-free or current.
Limitation of liability
To the fullest extent permitted by law, Renovate Cafe and the people behind it are not liable for any loss, injury, damage, cost, or wasted material arising from your use of — or reliance on — this site, its calculators, or its guides. You use the information at your own risk.
Affiliate links and external sites
Some links are affiliate links; as an Amazon Associate and through other programs we may earn a commission from qualifying purchases, at no extra cost to you. We also link to third-party sites we don't control and aren't responsible for. See our privacy and disclosure page for more.
Questions
If something here is unclear or you believe a calculator or guide is wrong, please tell us — we genuinely want to fix it.
Last updated: June 2026.