Siding Calculator
Estimate the amount of siding needed for your house exterior. Enter your house dimensions, choose your siding type, and account for windows and doors. Get results in square feet, squares, and estimated cost with waste factor.
What Is a Siding Calculator?
A siding calculator helps you estimate the amount of siding material needed to cover the exterior walls of a house or building. It calculates the total wall area, subtracts openings for doors and windows, and accounts for waste and trim.
Siding is typically sold by the "square" — one square equals 100 square feet of wall coverage. This calculator provides results in both square feet and squares, making it easy to order the right amount of material.
How Does the Siding Calculator Work?
The calculator follows these steps:
Step 1: Calculate the perimeter of the house based on the selected shape.
Step 2: Multiply perimeter by wall height to get gross wall area.
Step 3: Add gable area (if specified).
Step 4: Subtract door and window areas (21 sq ft per door, 15 sq ft per window).
Step 5: Apply waste factor and calculate squares.
Step 6: Estimate cost based on price per square foot.
The calculator supports multiple siding types with different coverage and pricing considerations.
Why Use This Siding Calculator?
- Three Shapes: Supports rectangle, square, and L-shaped houses.
- Multiple Siding Types: Choose from vinyl, wood, fiber cement, metal, and engineered wood.
- Waste & Trim: Account for waste factor and trim/accessories.
- Cost Estimation: Enter price per square foot to estimate total material cost.
- Free & Private: No registration, no data storage.
Siding Material Comparison
- Vinyl Siding: Affordable, low maintenance, available in many colors. Average cost: $3-8 per sq ft.
- Wood Siding: Natural beauty, can be painted or stained. Requires regular maintenance. Average cost: $5-12 per sq ft.
- Fiber Cement: Durable, fire-resistant, holds paint well. Average cost: $6-15 per sq ft.
- Metal Siding: Very durable, fire-resistant, low maintenance. Average cost: $8-20 per sq ft.
- Engineered Wood: More stable than natural wood, less maintenance. Average cost: $4-10 per sq ft.
❓ Siding Calculator FAQ
How do I calculate siding for my house?
Measure the length, width, and height of your house. Enter these dimensions into the calculator, along with the number of doors and windows. The calculator will estimate the total siding area needed.
What is a "square" of siding?
A square of siding is 100 square feet of wall coverage. Siding is typically sold by the square, so knowing how many squares you need makes ordering easier.
How much siding do I need for a 2,000 sq ft house?
For a 2,000 sq ft house with average wall height, you'll typically need 1,800-2,200 sq ft of siding (18-22 squares), depending on the number of windows and doors.
What is a waste factor in siding?
The waste factor accounts for cuts, damaged pieces, and pattern matching. A typical waste factor is 10-15%. This calculator includes a configurable waste factor.
How do I calculate the perimeter of my house?
Add the length of all exterior walls. For a rectangle: 2 × (Length + Width). For an L-shape: add all the exterior wall segments.
How much do doors and windows reduce siding area?
Each door reduces the siding area by about 21 sq ft, and each window by about 15 sq ft. The calculator subtracts these automatically.
What is a gable and how does it affect siding calculation?
A gable is the triangular portion of a wall under a peaked roof. It adds to the siding area. Enter the gable height (from the top of the wall to the peak) to include it in the calculation.
What type of siding is the most affordable?
Vinyl siding is generally the most affordable option, with prices ranging from $3-8 per square foot installed. Engineered wood is also relatively affordable.
What siding lasts the longest?
Fiber cement siding (like HardiePlank) and metal siding are among the most durable, with lifespans of 40-50+ years with proper maintenance.
How do I estimate the cost of siding?
Enter the price per square foot in the calculator. The total cost will be calculated based on the total siding area with waste factor.
Do I need to include trim in my siding estimate?
Yes, trim (corner posts, J-channels, soffit, fascia) adds to the total cost. This calculator includes an option to add 10% for trim and accessories.
How do I prepare walls for siding installation?
Remove old siding, repair any damage, install house wrap or building paper, and ensure the wall is flat and level before installing new siding.
Can I install siding over old siding?
In some cases, yes. You can install vinyl or metal siding over existing siding if the wall is in good condition. However, building codes may require a vapor barrier. Always check local codes.
What is the best siding for cold climates?
Fiber cement siding performs well in cold climates. It doesn't warp or crack in freezing temperatures and provides good insulation when combined with proper wall insulation.
What is the best siding for hot climates?
Vinyl siding with reflective technology and fiber cement siding both perform well in hot climates. Light colors help reflect heat and reduce cooling costs.
How do I maintain different types of siding?
Vinyl: wash annually with soap and water. Wood: repaint or restain every 3-5 years. Fiber cement: repaint every 8-12 years. Metal: wash and inspect for scratches annually.
Can I use this calculator for commercial buildings?
Yes, this calculator works for any rectangular or L-shaped building. For complex commercial buildings, break the structure into sections and calculate each separately.