Siding Square Footage Calculator – Estimate Wall Coverage Easily

Last updated: 27 Aug 2025 | Author: Brij | Review By: Irshad

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Easily estimate siding needs with our Siding Square Footage Calculator. Enter wall dimensions and openings to get total siding area.

Wall Height:

Wall Width:

Number of Walls:

Deduct Openings (Doors/Windows) - Optional

Number of Doors:

Door Width:

ft

Door Height:

ft

Door Area:

sq ft

Number of Windows:

Window Width:

ft

Window Height:

ft

Window Area:

sq ft

Siding Calculation Results

Gross Wall Area:

sq ft

Total Openings Area:

sq ft

Net Siding Area:

sq ft

Siding Squares (100 sq ft):

squares

If you are planning to install new siding on your house, knowing the square footage of siding required is essential. This ensures you buy the right amount of material, avoid wastage, and stay within budget. The Siding Square Footage Calculator helps you determine how much siding you need by taking wall dimensions and subtracting areas of openings like doors and windows.

Formula for Siding Square Footage

Step 1: Calculate Wall Area

$\text{Wall Area} = \text{Wall Height} \times \text{Wall Width}$

Step 2: Multiply by Number of Walls

$\text{Total Wall Area} = \text{Wall Area} \times \text{Number of Walls}$

Step 3: Deduct Openings (Doors/Windows)

$\text{Opening Area} = \text{Opening Height} \times \text{Opening Width}$

$\text{Total Openings} = \sum \text{(All Openings)}$

Step 4: Final Siding Square Footage

$\text{Siding Square Footage} = \text{Total Wall Area} - \text{Total Openings}$

Example Calculation

Suppose you have:

Wall Height = 10 ft
Wall Width = 20 ft
Number of Walls = 2
One Door = 7 ft × 3 ft

Step 1:

$\text{Wall Area} = 10 \times 20 = 200 \, \text{ft}^2$

Step 2:

$\text{Total Wall Area} = 200 \times 2 = 400 \, \text{ft}^2$

Step 3:

$\text{Opening Area (Door)} = 7 \times 3 = 21 \, \text{ft}^2$

Step 4:

$\text{Siding Square Footage} = 400 - 21 = 379 \, \text{ft}^2$

Applications of Siding Square Footage Calculator

Homeowners – Estimate siding material for renovations.
Contractors – Calculate accurate siding requirements for clients.
DIY Projects – Plan budget and material purchase effectively.
Real Estate – Assess siding coverage before property upgrades.

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