About Siding Calculator
Siding Calculator is a set of free, browser-based calculators for estimating siding materials and project costs. The goal is simple: give homeowners and contractors a fast, transparent way to turn wall measurements into a material and cost estimate, without an account, a sales call, or a hidden paywall.
What this site does
Every calculator on this site runs entirely in your browser. You enter measurements — walls, gables, windows, doors — and the calculator applies standard construction formulas (wall area, gable area, waste allowance, unit conversion) to produce an estimate. Nothing you enter is sent to a server; your data stays on your device.
Our approach to accuracy
These calculators use documented, standard construction formulas — the same take-off logic a contractor would use manually. Material coverage assumptions (like sq ft per carton or board) are editable defaults, not universal specifications, because coverage genuinely varies by manufacturer and product line. Every calculator page documents its formula and assumptions so you can verify the math yourself.
Estimates, not quotes
Every result on this site is a planning estimate. Actual material quantities and project costs depend on factors a calculator can't see — your home's exact geometry, local labor rates, site access, and the specific product you choose. Use these calculators to prepare for a conversation with a contractor or supplier, not as a substitute for an on-site measurement or a professional quote.
Contact
Questions, corrections, or feedback are welcome — see the contact page for how to reach us.