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

PitchRise per 12" RunMultiplierCategory
2:12 (Flat)2"×1.014Low
3:123"×1.031Low
4:124"×1.054Moderate
5:125"×1.083Moderate
6:126"×1.118Moderate
7:127"×1.158Steep
8:128"×1.202Steep
9:129"×1.250Steep
10:1210"×1.302Very Steep
12:12 (Steep)12"×1.414Very Steep

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