Roof Project
Start with pitch

Task category

Roof measurement

Start with the measurements you have: rise and run, a roof footprint or measured surface areas. Choose the matching tool before estimating materials. Pitch, roof area, rafter centerlines, rainfall collection and attic vent-area targets. Each tool states which measurements it accepts and what it does not derive.

13 tasks listed. Browse the directory below or enable JavaScript to search.

Pitch and rafters

Roof pitch and slopeTurn rise, run or an angle into a roof pitch and slope measures. Rafter lengthFind the sloped length of a simple roof section from rise and run. Hip rafter lengthFind a hip centerline from two plan offsets and vertical rise.

Area and roof shapes

Roof area from footprint and pitchEstimate sloped area when the footprint and pitch are known. Measured quantity totalsAdd separate measured areas, lengths or fitting counts in one unit. Roof squaresConvert measured roof area into 100-square-foot roofing units. Gable roof areaEstimate both sloped sides of an equal-gable roof section. Hip roof areaAdd four measured sloped planes for a hip roof. Lean-to roof areaFind the sloped area of one single-slope roof plane. Gambrel roof areaAdd the measured upper and lower planes on both sides.

Rain collection

Roof runoff volumeEstimate gallons from catchment area, rainfall and runoff coefficient. Rain barrel yieldEstimate potential rainwater volume reaching a collection point.

Attic ventilation

Attic ventilationTranslate attic area and vent assumptions into NFVA targets and ridge rolls.
Need a different step?Browse all calculator groups or check how to use an estimate before using a result.