1. What is the Roof Shingles Calculator?

The Roof Shingles Calculator helps determine how many bundles of shingles you need to cover your roof based on the roof area and the coverage provided by each bundle of shingles.

2. How Does the Calculator Work?

The calculator uses a simple formula:

Where:

• Roof Area — Total square footage of your roof
• Coverage per Bundle — Area one bundle of shingles covers (typically 33.3 sqft for standard 3-tab shingles)

Explanation: The calculator divides your total roof area by the coverage area of one bundle to determine how many bundles you need, then adds 10% to account for cutting waste.

3. Importance of Accurate Calculation

Details: Calculating the correct number of shingle bundles ensures you purchase enough materials without significant excess, saving time and money on your roofing project.

4. Using the Calculator

Tips:

• Measure your roof area accurately (length × width for each plane)
• Check the coverage per bundle for your specific shingle type
• The calculator automatically adds 10% for waste
• Round up to whole bundles when purchasing

5. Frequently Asked Questions (FAQ)

Q1: What's the typical coverage per bundle?
A: Standard 3-tab shingles typically cover 33.3 sqft per bundle, while architectural shingles may cover less (about 25-27 sqft per bundle).

Q2: Why add 10% for waste?
A: Roofs have hips, valleys, and penetrations that require cutting shingles, resulting in waste. 10% is standard for simple roofs; complex roofs may need 15%.

Q3: How do I measure my roof area?
A: Measure each roof plane (length × width) and sum all planes. For steep roofs, consider using the ground footprint dimensions with a multiplier.

Q4: Should I order extra bundles?
A: Yes, it's wise to purchase 1-2 extra bundles for future repairs, as color lots may vary between purchases.

Q5: How many bundles in a square?
A: A "square" in roofing equals 100 sqft. Typically 3 bundles make a square for standard shingles (3 × 33.3 = 100 sqft).