Siding Calculator
Estimate siding materials and cost for your home exterior
Perimeter of exterior walls
Average height of walls
Affects cost per square
10% standard, 15% for gables
Total Wall Area
—
sq ft
Siding Squares
—
squares
With Waste
—
sq ft
Estimated Cost
—
USD
Disclaimer: Results are estimates based on standard formulas. Not a substitute for professional advice from a licensed contractor, engineer, or architect. Verify all calculations before making purchasing or construction decisions.
How to Use This Calculator
Our siding calculator accounts for wall dimensions, openings, and waste to give you a precise material estimate.
- Measure perimeter of exterior walls
- Determine average wall height
- Select siding material
- Enter specifications
- Subtract window and door areas
Expert Insights
Smart analysis for your Siding project
Vinyl vs Fiber Cement TCO
Vinyl: $3-7/sqft installed, 20-40 year life. Fiber cement: $6-13/sqft, 50+ years. AI calculates 30-year total cost of ownership.
House Wrap & Flashing
Proper WRB and flashing prevents 90% of water damage. AI includes house wrap square footage in material estimates.
Thermal Expansion Allowance
Vinyl siding needs 1/4" gap at overlaps for expansion. AI calculates total material needed accounting for expansion gaps.
Calculation Formula
Wall area = Perimeter x Height
Squares = Wall area / 100
Total with waste = Wall area x (1 + Waste%)
Cost = Total x Price per sq ft
Frequently Asked Questions
How much does siding cost?
Vinyl: $5-$8/sq ft. Wood: $7-$14/sq ft. Fiber cement: $6-$12/sq ft. A 1,500 sq ft home costs $7,500-$18,000 for vinyl.
What is a square of siding?
A square equals 100 square feet of siding, the standard unit for ordering and pricing.