Roofing Cost Calculator
Use the roofing cost calculator below to get an instant material and installed price range for your project. To estimate roofing, multiply your home's footprint (length × width) by a pitch factor, then divide by 100 to get squares. Add 10–15% for waste. Shingles come 3 bundles per square. A 40×30 ft home with a 6:12 roof needs about 14.8 squares and costs roughly $5,900–$10,300 installed.
Your measurements
Pitch is the rise in inches per 12 inches of run.
Enter your measurements
Fill in the fields to see your estimate.
Roofing material cost & lifespan
Installed cost per square (100 ft²), including materials and labor. Prices vary by region.
| Material | Cost per square (installed) | Lifespan | Best for |
|---|---|---|---|
| 3-tab asphalt shingles | $350 – $500 | 15–20 yrs | Budget re-roofs |
| Architectural shingles | $450 – $700 | 25–30 yrs | Most homes |
| Metal roofing | $800 – $1,400 | 40–70 yrs | Longevity, snow |
| Wood shake | $600 – $1,000 | 25–30 yrs | Premium look |
| Slate / tile | $1,000 – $2,000 | 50–100 yrs | High-end, fire zones |
Roof pitch reference
Pitch is the vertical rise in inches per 12 inches of horizontal run.
| Pitch | Area multiplier | Description |
|---|---|---|
| 0–2:12 | 1.02 | Flat / low slope |
| 4:12 | 1.054 | Walkable, gentle |
| 6:12 | 1.118 | Most common |
| 8:12 | 1.202 | Steep, hard to walk |
| 12:12 | 1.414 | Very steep (45°) |
What affects roofing cost
- Project size — larger roofing jobs lower the cost per unit but raise the total.
- Material grade — premium products cost more but often last longer.
- Labor rates — local wages and demand swing installed prices significantly.
- Region — prices vary by state and metro (see local cost pages below).
- Site access & prep — removal of old material and difficult access add cost.
- Season — booking in the off-season can cut labor pricing.