Calculate bundles, rolls, and fastener requirements in real-time.
Estimates include standard overlap. We recommend adding 10-15% extra for complex valleys, hips, and starter courses.
Roofing Squares
20
Bundles/Panels
70
Underlayment Rolls
22
Fasteners (lbs)
30
Ridge Cap (LF)
6
A successful roofing project starts with an accurate material take-off. Beyond just shingles, you'll need to account for underlayment, ice and water shield, drip edge, ridge vents, and specialized fasteners. Ordering the right amount prevents project delays and reduces waste.
Our roofing material calculator helps you estimate the number of "squares" (100 square feet) and converts that into the number of shingle bundles and rolls of underlayment required for your project.
Choosing between traditional organic felt and modern synthetic underlayment is a key decision. Synthetic underlayment is more durable, tear-resistant, and provides better protection if the shingles are not installed immediately.
For standard architectural shingles, there are typically 20 to 26 shingles per bundle, with 3 bundles making up one "square" (100 sq. ft.).
Waste factor accounts for shingles that are cut at valleys and rakes, as well as damaged pieces. Complex roofs with many hips and valleys require a higher waste factor (up to 20%).
Every roofing calculator on this site is meant to give you a planning number, not a final contract price. Real roofing scopes change when a contractor verifies the roof geometry, checks how many layers need tear-off, looks at ventilation, and confirms whether flashing, skylights, gutters, or decking repairs are part of the work.
The best use of these tools is to narrow your range before you request an estimate. Once you know whether you are closer to a repair, a replacement, or a ventilation problem, you can compare bids with a much stronger understanding of the variables that actually move price and scope.
