About Roofing Calculator
Free roofing calculators for pitch, area, materials, rafter length, and replacement cost — built for contractors and homeowners.
What It Does
Roofing Calculator is a free suite of roofing tools — roof pitch, roof area, shingle and metal roofing materials, rafter length, and replacement cost estimates for 11 material types. Each calculator includes interactive SVG diagrams that update in real time as you enter measurements, so you can visualize your roof geometry as you calculate.
Why We Built It
Contractors need quick on-site calculations without pulling out a textbook. Homeowners need to understand their roof before talking to contractors — knowing your pitch, area, and approximate cost puts you in a stronger position. We built tools for both audiences that are fast, visual, and require no login.
Data Sources
Material pricing is based on 2026 US national averages from industry cost guides. Roof pitch calculations use standard trigonometric formulas (rise/run). Building code references follow the International Residential Code (IRC). All calculations run entirely in your browser — no data is sent to any server.
Contact
Have feedback or questions? Reach us at [email protected].