RoofTools calculators
Quick numbers from a few measurements, with the formula under each one.
- Roof Pitch CalculatorConvert roof pitch between rise over 12, degrees and percent, get the slope factor that turns footprint area into true roof area, and the rafter length for a given run.
- Roofing CalculatorWork out roof area, squares, shingle bundles, underlayment rolls, drip edge and ridge cap from the house size, pitch and overhang, for a gable or hip roof.
- Shingle CalculatorWork out how many bundles of shingles, starter strip and ridge cap and how many rolls of underlayment a roof needs, from its measured area and edge lengths.
- Gutter CalculatorWork out whether a roof needs 5 or 6 inch K-style gutters, how many downspouts, hangers and end caps, and how much gutter to order.
- Solar Panel CalculatorWork out the solar system size, number of panels and roof area you need from your electricity use, plus yearly savings and simple payback at your own rates.
- How Accurate Is a LiDAR Roof Measurement? Tested Against EagleViewWe measured nine roofs from free public LiDAR and compared them with EagleView, Roofr and RoofSnap reports. Area came within 7.5% where the comparison was fair and pitch within 1/12.