Siding Calculator
Calculate the amount of siding needed for your house walls, including waste factor and cost estimation.
Published by:
isCalculator Editorial Team
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How to use this tool?
How to Use the Siding Calculator
This calculator estimates the number of siding units and total cost needed for a wall, accounting for openings and waste.
- Enter Wall Dimensions (in feet):
- Wall Width (ft) – e.g., 40
- Wall Height (ft) – e.g., 10
- Windows & Doors Area (sq ft) – total area of openings, default 0
- Enter Siding & Cost Details:
- Siding Coverage (sq ft per unit) – e.g., 100
- Waste Factor (%) – extra material for cuts, default 10%
- Cost per Unit ($) – price per siding unit
- Click "Calculate" – results appear below.
Results explained:
- Wall Area = (Width × Height) – Openings (sq ft)
- Siding Needed = Wall Area × (1 + Waste/100) ÷ Coverage, rounded up to whole units
- Total Cost = Siding Needed × Cost per Unit
All inputs must be positive numbers. Use feet for dimensions and square feet for areas.
Previous Results
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Frequently Asked Questions
Measure the width and height of each wall in feet, then multiply to get square footage. Subtract the area of windows and doors. Sum all walls for total area.
Waste factor accounts for cuts, mistakes, and trimming. Typically 10% is recommended, but it can vary based on wall complexity.
Coverage is the area one unit of siding covers (e.g., one box or panel). Check the product label for square footage per unit.