Free roofing calculators for contractors

Add each rectangular section of the roof with its pitch. You get the plan area, the true sloped area, roofing squares and a bundle count, in feet or metres.

Enter a rise and run, an angle or a percent. Get the pitch, the angle, the pitch factor, the hip/valley factor and the rafter length for your run.

Enter the pitch, the overhang and your eave and valley lengths. You get the coverage up the slope, the courses at the eave and the rolls to order.

Enter the roof’s true area or its squares, add waste, then the eave, rake, ridge and hip lengths. You get order squares, shingle bundles, starter bundles and cap bundles.

Enter the roof area, the waste and the edge lengths. You get shingles, underlayment, starter, cap, drip edge, ice and water, valley metal and nails, in the units you order them.

Convert an x/12 pitch to degrees, or a degree reading to x/12, and get the percent slope and pitch factor. The full chart from 1/12 to 24/12 is below.

Pick the roof type to start from a suggested waste range, adjust the percentage, and enter the true roof area. You get the waste area, the area to order, squares and bundles.

Enter the pitch, the level run each hip and valley covers, and the ridge length. You get every hip and valley length, the cap lineal feet and bundles, and the valley metal pieces.

Enter the eave and rake lengths. You get the drip edge lineal feet, the sticks to order once the laps are taken out, and the starter bundles for the eaves, with or without the rakes.

Enter what the job costs you: materials, labor, tear-off, disposal and overhead. Set a target margin and get the price, the profit and the price per measured square. Nothing is pre-filled.

Read a roof’s pitch from the street on Street View.