Gross Wall Area (House Mode)
multiplied by wall height to get the total wall surface before deductions. grossArea = perimeter × wallHeight
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About Siding Calculator
Siding takeoff for house perimeters, gable ends, square feet, package counts, and cost.
HouseGable endsSquare feetCost
About this calculator
What this does
Calculates the total siding material needed for a house or building project, supporting three input modes: full house takeoff from perimeter and wall height, direct wall area entry, and gable-end-only calculation. It computes gross area, subtracts window and door openings, adds waste, and converts the result into siding squares, package counts, and estimated material cost.
Who it is for
Homeowners, contractors, and DIY builders planning a siding project who need accurate material quantities and cost estimates. Works with any siding material including vinyl, fiber cement, and engineered wood.
How it works
Depending on the selected mode, the calculator starts with perimeter × wall height (house mode), a direct wall area entry (area mode), or gable triangle area (gable mode). It adds gable area where applicable, subtracts openings, applies the waste percentage, and divides by 100 to get siding squares. Package counts are rounded up from the coverage-per-unit input, and cost is calculated from the price per square foot on the order area.
Limitations
Assumes rectangular walls and simple gable geometry. Complex wall shapes, multiple stories, dormers, and curved surfaces may need manual adjustment. The cost estimate uses a single price per square foot and does not include labor, trim, fasteners, or disposal fees.
Formula
Gable Triangle Area
Each gable end is a triangle above the wall plate. gableArea = gableCount × (gableWidth × gableRise / 2)
Net Area and Order Area
Subtract openings from the gross wall plus gable area, then add waste to find the final order quantity. netArea = grossArea + gableArea - openings, orderArea = netArea × (1 + wastePercent / 100)
Siding Squares and Package Count
Convert square feet to siding squares (100 sq ft each) and round up the package count from the coverage per unit. sidingSquares = orderArea / 100, packageCount = ceil(orderArea / coveragePerUnit)
How it works
Step 1
Choose your input mode
Select House for a full perimeter-based takeoff, Direct Area when you already know the wall square footage, or Gable Ends to calculate only the triangular gable faces.
Step 2
Enter your measurements
For House mode, input the building perimeter and wall height. For Gable mode, enter the gable width, rise, and count. Add openings area for windows and doors to be subtracted.
Step 3
Select a material preset
Choose from Generic, Vinyl, Fiber Cement, or Engineered Wood. Each preset comes with a suggested waste percentage and package label that adjusts the purchase math.
Step 4
Set waste and coverage
Adjust the waste percentage (default 10%) and enter the coverage per unit from your product packaging so the calculator can determine how many boxes, panels, or boards to buy.
Step 5
Add pricing for a cost estimate
Enter the price per square foot to see an estimated material cost based on the order area after waste.
Step 6
Review your results
Check the order area, siding squares, package count, and estimated cost. The summary panel shows gross area, gable area, openings removed, and net area for a complete takeoff breakdown.
Reference ranges
Siding Squares
A typical small house (1,200 sq ft footprint) needs 20-30 siding squares. A mid-size home (2,000 sq ft) needs 30-40 squares. Large homes can exceed 50 squares.
Waste Allowance
10% is standard for simple rectangular houses. 12-15% is recommended for complex roofs, multiple gables, or when using pattern-matched materials like fiber cement.
Package Count
Vinyl siding boxes typically cover 20-24 sq ft per box. Fiber cement boards cover 8-12 sq ft per board. Engineered wood panels cover 30-40 sq ft per panel.
Cost per Square Foot
Vinyl: $2-7 per sq ft installed. Fiber cement: $6-13 per sq ft. Engineered wood: $5-10 per sq ft. Material-only costs are typically 40-60% of the installed price.