1. What is an Asphalt Shingle Roof Installation Cost Calculator?

Definition: This calculator estimates the total cost to install an asphalt shingle roof based on roof size, material cost per square, and labor costs.

Purpose: It helps homeowners and contractors budget for roof replacement or installation projects.

2. How Does the Calculator Work?

The calculator uses the formula:

Where:

• \( C \) — Total installation cost ($)
• \( Q \) — Roof quantity (squares, where 1 square = 100 sq ft)
• \( P_{square} \) — Price per square of materials ($/square)
• \( C_{labor} \) — Labor cost ($)

Explanation: The roof size in squares is multiplied by material cost per square, then labor costs are added to get the total installation cost.

3. Importance of Accurate Cost Estimation

Details: Proper cost estimation ensures budgeting accuracy, helps compare contractor quotes, and prevents unexpected expenses during roofing projects.

4. Using the Calculator

Tips: Enter the roof size in squares (divide total sq ft by 100), material cost per square (default $120), and labor cost (default $3000). All values must be ≥ 0.

5. Frequently Asked Questions (FAQ)

Q1: What is a "square" in roofing terms?
A: A square equals 100 square feet of roof area, the standard measurement unit for roofing materials.

Q2: What's a typical price range per square?
A: Asphalt shingles typically cost $80–$150 per square, depending on quality and region.

Q3: How is labor cost determined?
A: Labor usually costs $1.50–$3.00 per sq ft ($150–$300 per square), or a flat rate for the project.

Q4: Does this include removal of old roofing?
A: No, tear-off costs are additional. Add 15-25% to the total if removing old roofing.

Q5: What other costs should I consider?
A: Include underlayment, flashing, vents, permits, and disposal fees in your total budget.