About the Shingle Calculator
Asphalt shingle bundles and squares for a roof, with starter and ridge cap allowances.
Also known as: asphalt shingles calculator, roofing squares, shingle bundles needed, roof shingles.
How to use this calculator
- Enter roof area, waste allowance, ridge and hip length, eaves length and the other fields.
- The result updates instantly as you type — press Calculate (or Enter) at any time.
- Review the breakdown shown under the main result.
- Use Copy result or Share to save the answer or send a link with your inputs.
Formula
1 square = 100 ft² = 3 bundles of standard shingles
Worked example
Using the values pre-filled in the calculator above:
- Roof area = 150 m²
- Waste allowance = 10 %
- Ridge and hip length = 15 m
- Eaves length = 24 m
- Price per bundle = 32
the calculator returns:
- Shingle bundles: 56
- Roofing squares: 17.76
- Field bundles: 54
- Ridge cap bundles: 2