Roofing Shingle Calculator

Multiply the building footprint by the pitch factor to get true roof area, add the waste percentage you choose, and convert the result into roofing squares, shingle bundles at 3 per square, and underlayment rolls at 4 squares per roll.

Roofing Shingle Calculator

Multiply the building footprint by the pitch factor to get true roof area, add the waste percentage you choose, and convert the result into roofing squares, shingle bundles at 3 per square, and underlayment rolls at 4 squares per roll.

Method and assumptions

Figur turns your measurements into purchase quantities with standard geometry: it computes the area, length, or volume, applies the waste or spacing you enter, and rounds up to whole purchase units. Everything is calculated locally in your browser.

  • Purchase quantities round up to whole units (sheets, bundles, boards, bars, or packages) because suppliers do not sell fractions.
  • Assumed coverages and package sizes (for example, 3 bundles per square or 4×8 sheets) are common conventions; verify your product label and supplier.
  • The waste percentage is applied exactly as entered; complex cuts, patterns, and damage can require more.
  • The result does not replace your field measurements, plans, or local code requirements.

This tool provides a planning takeoff, not a binding bid, structural design, or engineering advice. Confirm quantities with field measurements, your supplier, and the applicable professionals before buying.

Sources and references

No external data source is required: this calculator applies standard geometry to the measurements, coverages, and waste you enter.

Frequently asked questions

What is a roofing square?

One square is 100 square feet of roof surface. Shingles are commonly packaged 3 bundles per square, which is the purchase assumption this calculator uses.

How much waste should I add?

Simple gable roofs often carry about 10% waste; hips, valleys, and dormers can push it to 15% or more. The calculator applies exactly the percentage you enter, so match it to your roof's complexity.