Roofing Calculator - Pitch, Rafter & Materials

About

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.