Every calculator, guide, comparison and buyer's pick on the site — organized by what you're trying to do. Bookmark this page; it's the fastest way to find the right tool for your roofing project.
Every calculator and guide on the site, grouped by the order you actually need them. A roofing job runs measure, frame, cover, trim, then price — working in that order means each tool takes its input from the one before it rather than sending you back to re-measure.
Footprint, pitch, roof area, squares. Everything downstream depends on these, and all of them can be taken without going onto the roof: measure the outline on the ground, and take the pitch off a rafter in the attic with a 12-inch level.
| Pitch | Angle | Slope % | Multiplier | 2,000 sq ft footprint becomes |
|---|---|---|---|---|
| 1/12 | 4.8° | 8.3% | 1.0035 | 2,007 sq ft |
| 2/12 | 9.5° | 16.7% | 1.0138 | 2,028 sq ft |
| 3/12 | 14.0° | 25.0% | 1.0308 | 2,062 sq ft |
| 4/12 | 18.4° | 33.3% | 1.0541 | 2,108 sq ft |
| 5/12 | 22.6° | 41.7% | 1.0833 | 2,167 sq ft |
| 6/12 | 26.6° | 50.0% | 1.1180 | 2,236 sq ft |
| 7/12 | 30.3° | 58.3% | 1.1577 | 2,315 sq ft |
| 8/12 | 33.7° | 66.7% | 1.2019 | 2,404 sq ft |
| 9/12 | 36.9° | 75.0% | 1.2500 | 2,500 sq ft |
| 10/12 | 39.8° | 83.3% | 1.3017 | 2,603 sq ft |
| 12/12 | 45.0° | 100.0% | 1.4142 | 2,828 sq ft |
| 14/12 | 49.4° | 116.7% | 1.5366 | 3,073 sq ft |
| 16/12 | 53.1° | 133.3% | 1.6667 | 3,333 sq ft |
| 18/12 | 56.3° | 150.0% | 1.8028 | 3,606 sq ft |
| 20/12 | 59.0° | 166.7% | 1.9437 | 3,887 sq ft |
| 24/12 | 63.4° | 200.0% | 2.2361 | 4,472 sq ft |
Measure, frame, cover, trim, then price. Each stage takes its input from the one before, so working out of order usually means re-measuring.
The pitch. It sets the area multiplier, which sets every material quantity, and it decides which coverings the code allows at all. Reading 6/12 on an 8/12 roof leaves you short on everything.
No, and you should not. Measure the footprint on the ground to the outside of the eaves, and take the pitch from a rafter in the attic with a 12-inch level. That gives the same answer far more safely.
The cost by state pages give the per-square baseline for your state, and the cost by city pages scale it by the local metro factor. Both state their assumptions and both are planning estimates, not quotes.