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Roofing Calculator
Calculate roofing materials: shingles, underlayment, and ridge caps needed. Accounts for roof pitch and waste factor.
Cubic Feet
33.33 cu ft
Cubic Yards
1.23 cu yd
80-lb Bags
47 bags
60-lb Bags
62 bags
How to Use the Roofing Calculator
Enter your values above for an instant result. This tool uses verified formulas and is optimised for users in USA, Canada, UK, Australia. All calculations happen in your browser — your data is never sent to our servers.
Frequently Asked Questions
How do I calculate how many shingles I need?
Shingles are sold by the "square" (100 sq ft). Divide your roof area by 100, add 10% for waste. A 2,000 sq ft roof needs ~22 squares.