What the tool does, how to run it, and what to expect from the result.
Roof area = footprint (including overhangs) × pitch multiplier. 1,800 sq ft at 6/12 (× 1.118) is 2,012 sq ft. Roofers count squares of 100 sq ft; with 10% waste that is 22.14 squares, and standard 3-tab or architectural shingles come 3 bundles to a square: 67 bundles.
A quick way to understand who this helps, what it solves, and where it connects next.
Homeowners, DIYers and contractors estimating materials before a store run.
Using the roofing calculator without installing anything or signing up.
Short answers for the questions people usually have before trying a utility like this.
About 10% for a simple gable roof and 15-20% for hips, valleys and dormers.
No. Add starter and ridge-cap shingles by the linear foot of eaves and ridges.
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Enter your numbers and the result updates live in your browser. Nothing is uploaded and no server is used.
Estimates for planning; order 5-10% extra for waste and check local codes.