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Roofing Calculator

Calculate squares, shingle bundles, and underlayment for pitched roofs. Includes pitch correction for accurate area.

Inputs

Result

Squares
14.8
Shingle bundles
45
Total area
1476 ft²
Pitch factor
1.118
Underlayment rolls
4
Waste
10%

Waste default: 10% — NRCA: 10% standard, 15% for hips, 20% for complex multi-plane roofs.

Diagram

Width (footprint)RiseRun = 12

Estimates only. Verify with a licensed contractor or supplier before purchasing. Rough Estimator! is not responsible for shortages, overages, or material variances. See our methodology for formulas and sources.

Formula

Squares = (L × W) × √(1 + (pitch/12)²) × (1 + waste) ÷ 100

Pour-window forecast

Free 7-day forecast from Open-Meteo. Green = safe to roofing. We never share your location.

Related tools & materials

Don't forget

  • Underlayment
  • Ice & water shield
  • Drip edge
  • Roofing nails
  • Ridge cap

Frequently asked questions

A 1,200 ft² footprint with 6/12 pitch needs about 14 squares of shingles including waste.

Cite this page

Cosyslabs. (2026). Roofing Calculator. Rough Estimator!. https://roughestimator.com/roofing-calculator

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