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Estimate your roof size and replacement cost in your area.
Annual rainfall: 40" — affects material recommendations
Multiplier: 1.12x ground footprint
Expected lifespan: 25-30 years
Ground Footprint
1,500
sq ft
Total Roof Area
1,680
sq ft
Roofing Squares
17
squares (100 sq ft each)
Shingle Bundles
57
bundles needed
Estimated Replacement Cost
Architectural Shingles • Includes tear-off and labor
$9,775 - $14,025
$575 - $825 per square
Materials Estimate
Shingle Bundles
57
Underlayment Rolls
5
Ridge Cap Bundles
5
This is an estimate based on standard calculations. Actual costs vary based on roof accessibility, existing damage, local material costs, and contractor rates. A professional inspection is required for accurate pricing.
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Planning a roofing project? Whether you're getting quotes from contractors or tackling a DIY re-roof, knowing how much material you need is essential. Nothing derails a project faster than running short of shingles mid-job—or paying for 20% more than you actually need.
Our shingle calculator helps you estimate materials accurately. Just enter your roof dimensions, and we'll tell you how many bundles of shingles, rolls of underlayment, and other materials you need to complete the job.
Even if you're hiring out the work, running these numbers yourself helps you evaluate contractor quotes. If a bid shows 50 squares of shingles for a roof that should only need 35, that's a red flag worth discussing.
Roofing is measured in 'squares'—each square equals 100 square feet of roof area. Here's what goes into our calculation:
Roofing materials are a major expense. Knowing your exact needs helps you budget and compare quotes effectively.
Running out of shingles mid-project means delays, additional delivery fees, and potential color matching issues.
Over-ordering means paying for materials you don't need. Our calculator includes appropriate waste factors without going overboard.
When you know what your roof actually needs, you can spot inflated quotes or unrealistically low bids.
Mistake: Measuring the house footprint instead of roof area
Solution: A house that's 30×40 feet doesn't have a 1,200 sq ft roof if it has any pitch at all. Pitch multipliers can add 10-40% to the actual surface area.
Mistake: Forgetting about overhangs
Solution: Roof overhangs (eaves and rakes) add square footage. A typical 1-foot overhang on a 40-foot side adds 80+ square feet of roofing.
Mistake: Not accounting for complexity
Solution: A simple gable roof has much less waste than one with multiple hips, valleys, and dormers. Complex roofs can have 15-20% waste factors.
Mistake: Underestimating accessories
Solution: Starter strips, drip edge, hip and ridge shingles, and vents add up. These can represent 10-15% of your total material cost.
DIY roofing can save money, but some situations definitely call for professionals:
Most architectural shingles require 3 bundles per square (100 sq ft). Some premium shingles need 4-5 bundles per square. 3-tab shingles also use 3 bundles per square but are less common now.
Place a level against your roof and measure how many inches the roof rises over 12 inches of horizontal run. That gives you your pitch (e.g., 6/12 means 6 inches of rise per 12 inches of run). You can also measure from inside the attic.
Removing old shingles is almost always better. It lets you inspect the deck, install new underlayment, and results in a longer-lasting roof. Most codes allow only two layers of shingles—if you already have two, tear-off is mandatory.
Architectural (dimensional) shingles are thicker, more durable, and have a multi-dimensional appearance. They typically last 25-30 years vs. 15-20 for 3-tab. They cost more but offer better warranties and wind resistance.