Siding Calculator

Calculate how much siding you need for your home exterior. Works for vinyl, fiber cement, wood, and all siding types.

🏠 Enter Your Measurements

Combined length of all walls

Height of triangular gable area

Total area of windows and doors

Planning your budget?

Read the full Siding Cost Guide 2026

→

Related Tools

All ToolsExterior Paint CalculatorRoofing CalculatorAI Exterior Design

How to Calculate Siding for Your Home

Our siding calculator helps you estimate materials for vinyl, fiber cement, wood, and other siding types. Enter your wall dimensions, gable areas, and window/door openings to get accurate estimates.

What is a Square of Siding?

A "square" is an industry-standard measurement equal to 100 square feet of siding coverage. This is how siding is typically sold by manufacturers and contractors.

How Much Extra Siding Should I Order?

We recommend ordering 10-15% extra siding to account for:

  • Cuts and waste around windows and doors
  • Mistakes during installation
  • Damaged pieces that may need replacement
  • Complex architectural features

FAQ

How many squares of siding for a 1500 sq ft house?

A typical 1500 sq ft single-story home needs about 15-20 squares of siding, depending on layout and window/door openings.

Frequently asked questions

How much siding do I need for a 2,000 sq ft house?⌄
A 2,000 sq ft house typically has about 1,700 to 2,200 sq ft of wall area to side (17 to 22 squares), depending on the number of stories, ceiling height, and how much area windows and doors take up. A two-story home of the same floor area usually needs less siding per square foot of living space than a sprawling ranch.
What is a "square" of siding?⌄
A square is the industry-standard unit for siding and roofing equal to 100 square feet of coverage. If your home has 1,800 sq ft of wall area, you need 18 squares of siding before adding waste.
How much does siding cost per square foot in 2026?⌄
In 2026, installed siding typically costs $4 to $20 per square foot. Vinyl runs $4-$8, fiber cement $8-$14, and wood, metal, or engineered wood options run $10-$20 per square foot installed, including labor and trim.
How much waste should I add when ordering siding?⌄
Add 10-15% to your net wall area. Simple rectangular homes can get by with 10%, while homes with many gables, dormers, corners, and openings need closer to 15% to cover all the angled cuts.
Can you install new siding over old siding?⌄
Sometimes. Vinyl can go over flat, sound wood siding with furring and code approval, but removal is recommended. Tearing off the old siding lets you inspect the sheathing for rot, install a proper water-resistive barrier, and avoid trapping moisture between layers.

See What Your New Siding Could Look Like

Upload a photo and visualize your siding color and style with AI

Try AI Design Tool