Uniform worksheet · Home Improvement
Form RET-203 · Effective August 2026 · Borrower’s copy
Roofing Calculator
Calculate roofing shingles and underlayment needed.
Inputs
Roof Area
0 sqft
Squares
0
Shingle Bundles
0
Felt Squares
0
How to Use This Roofing Calculator
See MethodologyOur free roofing calculator estimates materials and cost for your roof replacement. Enter your roof dimensions to calculate shingles, squares of material, and total estimated cost.
Roofing is measured in squares — one square equals 100 square feet. A typical home has 20-30 squares. Our calculator converts your dimensions into squares and adds waste factor.
The calculator covers material options including architectural shingles, 3-tab shingles, and premium materials like slate or metal.
Related Topics
Frequently Asked Questions about Roofing Materials and Costs
How do I calculate how many shingles I need?
Measure roof area, divide by 100 for roofing squares, add 10-15% waste. Each bundle covers about 33 sq ft — 3 bundles per square.
How much does a roof replacement cost?
Typically $5,000-$15,000 for asphalt shingles. Architectural shingles cost $350-$550 per square installed.
What is a roofing square?
One roofing square equals 100 square feet of roof area. Materials are sold and priced per square.
How long does a roof replacement take?
Most residential roofs take 1-3 days depending on size, complexity, and weather.
What factors affect the cost of a new roof?
Roof size, pitch, material choice, complexity, local labor rates, and accessibility all affect cost.
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