Rectangular walls
wall_height × wall_perimeterFinds the main vertical wall surface from the combined wall run.
Inputs
Adjust the project details to update the estimate.
Planning estimates use standard formulas. Verify quantities with your supplier before ordering.
Estimate
A clearer siding order starts here.
Orderable siding area
Net wall coverage with allowance for overlaps and offcuts.
1,628 sq ft
Siding squares
Coverage expressed in the 100-square-foot unit contractors commonly use.
16.3 squares
Lower material range
A planning range for the less expensive end of the selected siding.
$4,884–$13,024
Rectangular walls: wall_height × wall_perimeter
Estimates use standard planning formulas. Verify quantities with your supplier or contractor before ordering.
See your project with AIExterior material estimate
Siding Calculator
Turn wall measurements into a siding order plan. This calculator accounts for gables, openings, a practical waste allowance, and the material you select.
Free to use Instant results Planning estimate
How to measure siding for a house
Measure each rectangular wall separately and add the results. For gables, calculate the triangle above the wall using half the base multiplied by its height. Large windows and doors should be measured as deductions rather than guessed from floor area.
The calculator adds ten percent after openings are removed. That reserve covers common cuts, overlaps, starter pieces, and a few damaged lengths. A home with many corners, dormers, or decorative transitions may need a larger allowance.
Use the material selector to compare a budget-friendly vinyl direction with fiber cement, wood, brick veneer, stucco, or engineered products. The output is a purchasing estimate, not a replacement for a takeoff from an installer.
Formulas used
Gables
½ × gable_height × gable_widthAdds triangular roof-end surfaces to the wall total.
Order area
(walls + gables − openings) × 1.10Subtracts major openings and applies a ten percent planning allowance.
Frequently asked questions
What to know before you order.
Is siding measured by floor area?
No. Siding follows the exterior wall and gable surfaces. Floor area can be a rough reference but does not capture wall height, roof shape, or openings.
What does one siding square mean?
One square represents 100 square feet of installed coverage. Packaging and waste still vary by product.
How much waste should I plan for siding?
Ten percent works as a general starting point. Complex facades with many angles may justify more after an installer reviews the elevations.
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