Roofing materials
calculator.
Underlayment rolls, drip edge pieces and starter bundles, from your lengths and the coverage printed on your products.
Your roof
Underlayment
Drip edge
Starter
Results
- Underlayment rolls
- —Rolls = roof area ÷ coverage per roll, rounded up
- Drip edge pieces
- —Pieces = (eaves + rakes) ÷ length of one piece, rounded up
- Starter bundles
- —Bundles = eaves (+ rakes if ticked) ÷ linear feet per bundle, rounded up
Nothing is added for laps, cuts or waste. Ice and water shield, ridge cap, flashing and nails are not included.
How the counts are worked out
Your numbers
Coverage per roll, piece length and starter coverage are printed on the product. The boxes that start filled in are only starting points: change them to match what you buy.
Rounded up
Each count is the length or area divided by what one roll, piece or bundle covers, rounded up to a whole one.
Where the lengths come from
A RoofReport measurement report lists the eaves and rakes in feet, along with the roof area.
See a sample reportMore free calculators
Same idea: you type the numbers, the math is shown.
Roof pitch calculator
Rise per 12, rise and run, or an angle: get the pitch, the angle in degrees, the percent grade and the pitch multiplier.
Open the calculatorRoof area & squares
Footprint and pitch to roof area and squares, squares to order with your waste %, and shingle bundles.
Open the calculatorGet exact measurements from an address.
Type an address and RoofReport measures the roof from aerial data: area, squares, pitch, eaves, rakes, ridges, hips and valleys.