How much roofing do I need?
Quick answer: enter your dimensions in the Roofing Calculator below to see yards, bags, and an optional cost estimate. Most home projects can be answered in under a minute.
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
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
Calculators
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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