#roof-pitch

Roofing geometry as an API, computed locally and deterministically. The pitch endpoint converts freely between the three ways trades describe a roof slope — the pitch as rise per 12 of run (the X:12 notation), the angle in degrees and the slope as a percentage — using angle = atan(pitch/12); a 6:12 roof is 26.57° and a 50 % slope, and it also returns the pitch multiplier √(1 + tan²) that scales a flat plan length to the true along-slope length. The rafter endpoint computes the common rafter length from the horizontal run and the pitch, rafter = √(run² + rise²) with rise = run·tan(angle), and adds the along-slope length of an optional horizontal overhang — a 12-unit run at 6:12 needs a 13.42-unit rafter. The area endpoint converts a flat building footprint into the actual sloped roof surface area, footprint / cos(angle), the figure you need to order shingles, membrane or underlay; a 100 m² footprint under a 6:12 roof is about 111.8 m². Lengths are unit-agnostic — use a consistent unit. Everything is computed locally and deterministically, so it is instant and private. Ideal for roofing, construction, contractor-estimating, home-improvement, solar-install and architecture app developers, take-off and material-ordering tools, and trade software. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is roofing-specific geometry; for a general grade or gradient use a slope API.

api.oanor.com/roofpitch-api

Roofing geometry as an API, computed locally and deterministically. The pitch endpoint converts a roof pitch between every common form — rise-over-run (such as 6:12), the angle in degrees, the percent slope, and the slope multiplier (the factor that turns a flat footprint into the real sloped area). The rafter endpoint computes the rafter length from the horizontal run and the pitch — that is, the hypotenuse √(run² + rise²) — with an optional overhang projected along the slope. The area endpoint computes the true sloped roof area from the building footprint (entered directly or as length × width) and the pitch, adds a wastage allowance, and reports the number of US roofing squares and shingle bundles needed. Everything is computed locally and deterministically, so it is instant and private. Lengths are unit-agnostic — use consistent units — while the squares and bundles figures assume US roofing squares of 100 square feet, so pass the footprint in square feet for those. Ideal for roofing contractors and estimators, construction and DIY tools, solar-install planning, and quoting software. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is roof geometry; for paint, tile, concrete and brick quantities use a construction-calculator API.

api.oanor.com/roofing-api