Roofing Calculator — quick roof pitch, rafter length, and material estimates right from your browser toolbar. Perfect for contractors, DIY homeowners, and anyone planning a roofing project. THREE CALCULATORS IN ONE: 📐 Pitch Calculator Enter rise and run to instantly see pitch ratio (X:12), angle in degrees, slope percentage, and pitch factor. Includes material recommendations based on your specific pitch. Quick presets for common pitches (3:12 through 12:12). 📏 Rafter Length Calculator Calculate exact rafter length from run, rise, and overhang measurements. Shows plumb cut and seat cut angles for accurate framing. 🧱 Materials Calculator Enter your roof area and waste percentage to calculate roofing squares, shingle bundles needed (3-tab and architectural), and total area including waste. Save your roof size for quick re-use. RIGHT-CLICK ESTIMATE: Select any number on any webpage and right-click to instantly calculate roofing materials or total cost. Works on Home Depot, Lowe's, or any site with measurements or prices. REMEMBERS YOUR DATA: Your last measurements, saved roof size, and waste percentage are stored locally across sessions. Open the popup anytime and your data is ready. PRIVACY: All calculations happen locally in your browser. We don't collect, store, or transmit any data. No analytics, no tracking. Visit https://roofing-calculator.io for the full calculator with interactive SVG diagrams, 24 pages of roofing tools, and pitch reference guides.