Roofing Calculator

Calculate roof area, squares, and shingle bundles needed for your roofing project.

Roof Dimensions

Roof Area
1,265 ft²
With Waste
1,391 ft²
Squares
13.91
Bundles Needed
42
Slope Factor
1.0541
Pitch Angle
18.4°

Pitch & Slope Reference

PitchAngleSlope FactorCategory
2/129.5°1.0138Low Slope
3/1214.0°1.0308Low Slope
4/1218.4°1.0541Moderate
5/1222.6°1.0833Moderate
6/1226.6°1.1180Moderate
7/1230.3°1.1577Moderate
8/1233.7°1.2019Moderate
9/1236.9°1.2500Steep
10/1239.8°1.3017Steep
12/1245.0°1.4142Steep

Material Estimates (per Square)

MaterialAmount
3-tab shingles3 bundles
Architectural shingles3 bundles
Hip & ridge cap1 bundle per 35 LF
Roofing nails2–2.5 lbs
Underlayment1 roll per 4 squares
Ice & water shield1 roll per 2 squares