Overview
What Is a Siding Calculator?
This tool calculates the total square footage of siding needed based on your home's exterior wall area, including waste allowance.
Calculate siding materials needed for your project.
This tool calculates the total square footage of siding needed based on your home's exterior wall area, including waste allowance.
Useful for planning a siding installation or replacement project.
Input the square footage of exterior walls to be covered.
The result includes a waste allowance and updates automatically.
10% extra is commonly recommended to account for cuts, waste, and future repairs.
This is a basic wall-area calculation - subtract window/door area separately for more precision, or the waste allowance can help cover this.
Often in squares (100 sq ft) or by individual piece, depending on the siding material type.
The area-based math is similar, though different siding types (vinyl, wood, fiber cement) have their own specific product dimensions.
No, calculations happen entirely in your browser.
Yes, triangular gable areas need their own area calculation (base × height ÷ 2) added to your rectangular wall totals.
Yes, once you know material quantity needed, you can get quotes based on this estimate.
No, this calculates the main siding panels - trim, corner pieces, and flashing are typically calculated and purchased separately.
Yes, just calculate the specific wall area you're re-siding rather than the whole home.
Yes, completely free with no sign-up required.