Shingle Calculator
Tools you might need next
Complete roofing material takeoff: shingles, underlayment, drip edge, nails, and ice shield. Enter roof area and pitch for full replacement material list.
Convert roof pitch rise and run to angle, percent slope, and pitch factor. Essential for roofing material estimates, rafter layout, and drainage design.
Calculate rafter length from span, pitch, and overhang. Get rafter run, rise, diagonal length, and birdsmouth cut dimensions for roof framing.
One roofing square equals 100 sq ft of roof surface. Shingles are sold by the square or bundle (typically 3 bundles per square for 3-tab).
Squares = Roof Area (sq ft) ÷ 100Architectural shingles often use 3–4 bundles per square. Apply 10–15% waste for cuts, ridges, and errors.
Bundles = ceil(Squares × Bundles per Square × (1 + Waste%))Order separate starter strips for eaves and ridge cap shingles for hips and ridges — not included in field shingle bundle count.
Ridge LF = Ridge Length; Starter = Eave LFUpdated: July 2026
18 squares × 3 bundles = 54 bundles field shingles. Add ridge cap (≈35 LF ridge) and starter for eaves separately.
6 squares needs 18–24 bundles depending on shingle weight class. Small roof — buy extra bundle for color lot matching.
300 sq ft repair zone needs 9 bundles minimum. Match existing shingle model and lot if possible for color blend.
Estimate asphalt shingle bundles before a roof replacement or repair. Enter total roof area in squares or square feet and shingle type to get bundle count with standard waste for hips, valleys, and starter courses.