Siding Calculator

All construction tools

Estimate the amount of vinyl, wood, or fiber cement siding needed for your home's exterior.

Wall Dimensions

Unit System

Wall Width (ft)

Wall Height (ft)

Openings Area (sq ft)

sq ft

Waste Factor (%)

Siding Estimate

Enter dimensions to calculate siding needs

About this calculator

Overview

Siding is sold by 'the square', which is an area of 100 square feet (9.29 square meters). This calculator helps you determine how many squares or square meters of material to order while accounting for doors, windows, and installation waste.

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Pro Tips

Don't forget to subtract the total area of all windows and doors for a more accurate estimate.
Consider the surface area of gables separately (Area = 0.5 × Base × Height).
Buy separate starter strips, J-channels, and corner posts as they are not included in the 'square' count.

Fun Facts

"One 'Square' equals 100 square feet (~9.29 square meters) of wall surface."
"Vinyl siding is typically the most affordable, while fiber cement and wood are premium options."
"Standard waste factors are 10% for simple rectangular walls and 15-20% for walls with gables or many corners."

Formula: Net Area = (Width × Height) - Openings Total Area = Net Area × (1 + Waste/100) Squares = Total Area / 100