How to use this roofing shingle calculator
Enter the requested values above and select Calculate. The result updates immediately on the page, so you can change one value and compare different scenarios without leaving the calculator.
Formula and method
Example
A 2,000 sq ft roof with 10% waste equals 22 roofing squares.
What this calculator is useful for
Estimate roofing squares and bundles from roof area and waste percentage. It is designed for quick estimates and everyday problem solving. When a calculation affects a contract, tax filing, medical decision or other high-stakes situation, verify the result with the appropriate professional or authoritative source.
Frequently asked questions
What does the Roofing Shingle Calculator calculate?
Estimate roofing squares and bundles from roof area and waste percentage.
How does the calculation work?
Roofing squares = adjusted square feet ÷ 100. Bundles = roofing squares × bundles per square, rounded up.
Is this calculator free?
Yes. ERICH Calculators is free to use and no account is required.