Rooftop Calculator

Rooftop Calculator — Gable, Hip, Shed, Gambrel & Flat Roof Area, Pitch & Cost Rooftop Calculator is a fast, offline roofing estimator for roofing contractors, builders, estimators, and DIY homeowners. Choose your roof type, enter dimensions, and get an instant 2D architectural plan with roof area, rafter lengths, material quantities, and total project cost. FIVE ROOF TYPES Gable (2-slope), Hip (4-slope with hips and ridge), Shed (single slope), Gambrel (barn/mansard double slope), and Flat (with drainage fall). Each type uses its own geometry for accurate surface area and linear lengths. PRECISE DIMENSIONS & PITCH Enter building length and width, overhang, and pitch in ratio (e.g., 6:12), degrees, or percent. Switch between metric (m, m²) and imperial (ft, sq ft, roofing squares) at any time. 2D CAD ARCHITECTURAL PLAN Dynamic vector drawing placed directly under the inputs showing edges, ridge, rafter lines, flow arrows, and architectural dimension arrows. All dimensions render in pure white (#FFFFFF) in dark mode for maximum on-site readability. MATERIALS & COST ESTIMATE Choose your covering: asphalt shingles, standing-seam or corrugated metal, clay or concrete tile, natural slate, or EPDM/TPO membrane. Enter material cost per unit area, labour cost per unit (placed below material cost), and adjust the waste factor with quick buttons (5%, 10%, 15%, 20%). Add accessories: ridge caps, flashings, gutters, and fasteners. DETAILED RESULTS Tap Calculate to get: developed roof surface and footprint area; rafter length (slope), ridge length, eave and gutter perimeter, hip and valley lengths; roofing squares, shingle or tile bundles (waste included), and underlayment rolls; plus a full financial breakdown (materials, waste, labour, accessories) and highlighted total project cost. SAVE, HISTORY & EXPORT Tap Save to store the project in local history. Search by project name or material, filter by roof type. Share specifications as text via WhatsApp, SMS, email, or notes. Export a professional A4 PDF estimate in your selected language with official KOCHI DIGITAL header and full geometric, material, and cost tables. Delete with individual confirmation. SETTINGS Live language switching (EN, FR, ES, AR, ZH) across all content including PDFs. Metric or imperial units. Currencies USD, EUR, CHF, FCFA, GBP, AUD, JPY. Dark mode by default, light mode, or system theme. About section with website, construction calculators, privacy policy, terms, and contact. BUILT FOR THE FIELD Works offline. No sign-up required. Responsive on phones and tablets. High-contrast borders for outdoor readability. Bottom navigation compatible with Android edge-to-edge. ABOUT KOCHI DIGITAL Kochi Digital builds minimalist, high-performance construction and real estate calculators. Explore more at kochidigital.com. Official website: https://kochidigital.com/apps/rooftopcalculator/ Download Rooftop Calculator and get reliable roof estimates — area, pitch, rafters, materials, and cost — anywhere, anytime.