Calculator
Roofing Calculator
Calculate shingles, squares, bundles, underlayment, and materials needed for any roof type and pitch.
🏚️Roof Setup
Units:
% (standard: 10%)
💰Cost Estimation (Optional)
📊Results
1476 ft²
Roof Area
footprint: 1200 ft²
14.8
Squares
100 ft² = 1 square
45
Shingle Bundles
3 bundles/square
17
Underlayment Rolls
1 roll/square
154
Drip Edge (lf)
linear feet
37 lbs
Nails
~2.5 lbs/square
Ridge Cap: 2 bundles (covers ~35 lf each)
📐Pitch Multiplier Reference
| Pitch | Rise per 12" Run | Multiplier | Category |
|---|---|---|---|
| 2:12 (Flat) | 2" | ×1.014 | Low |
| 3:12 | 3" | ×1.031 | Low |
| 4:12 | 4" | ×1.054 | Moderate |
| 5:12 | 5" | ×1.083 | Moderate |
| 6:12 | 6" | ×1.118 | Moderate |
| 7:12 | 7" | ×1.158 | Steep |
| 8:12 | 8" | ×1.202 | Steep |
| 9:12 | 9" | ×1.250 | Steep |
| 10:12 | 10" | ×1.302 | Very Steep |
| 12:12 (Steep) | 12" | ×1.414 | Very Steep |