Free Roof Shingle Calculator
Calculate how many shingles (squares and bundles) you need for a roof. Enter the roof area to get the number of squares and bundles.
Total roof surface area including pitch
10% for simple roofs, 15% for complex
Total length of ridges and hips
Bundles (3 per square)
66
Bundles (3 per square) vs Roof Area
How to Calculate Roof Shingles
Formula
Squares = Roof Area / 100
Bundles = Squares × 3
A "square" of roofing is 100 square feet. Most asphalt shingles come 3 bundles per square. For ridge caps, one bundle covers approximately 35 linear feet of ridge or hip. Always add 10-15% for waste and starter strips.
Example Calculation
A roof with 2,000 sq ft of area, 10% waste, and 40 ft of ridge line.
- 01Adjusted area = 2,000 × 1.10 = 2,200 sq ft
- 02Squares = 2,200 / 100 = 22 squares
- 03Bundles = 22 × 3 = 66 bundles
- 04Ridge cap bundles = 40 / 35 = 1.14 → 2 bundles
- 05Underlayment rolls = 2,200 / 400 = 5.5 → 6 rolls
Frequently Asked Questions
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