Siding Calculator
Your estimate
Area1,452 ft²161.33 yd² · 134.9 m²
Panels175
- Roofing squares
- 14.52
Walls plus gable triangles minus doors and windows, in squares and panels.
Updated 2026-10-20 · Based on: coverage figures from paint and drywall makers (USG).
How to use the Siding Calculator
- Enter the perimeter of the house and the wall height.
- Add the gables (width and height of each triangle).
- Subtract doors and windows (about 20 ft² and 15 ft² each).
- Read the squares and panels.
Formula
Area = perimeter × height + gables × width × height ÷ 2 − openings, then + 10 % waste.
One square = 100 ft². A double-4 in vinyl panel 12 ft 6 in long covers about 8.33 ft².
Worked example
With the values preset in the calculator above:
- House perimeter
- 140 ft
- Height
- 9 ft
- Gables
- 2
- Gable width
- 30 ft
- Gable height
- 7 ft
- Doors & windows (area)
- 150 ft²
- Coverage per panel
- 8.33 ft²
- Extra for waste
- 10 %
- Area
- 1,452 ft² (161.33 yd²)
- Roofing squares
- 14.52
- Panels
- 175
Frequently asked questions
How many squares of siding for a house?
A 140 ft perimeter, 9 ft walls and two 30 × 7 ft gables: about 14.52 squares with waste.
How much does vinyl siding cost?
Roughly $4–$8 per ft² installed in 2026; fiber cement $7–$13.
Do I subtract windows?
Subtract large openings, but keep the 10 % waste — trimming around windows uses extra material.
More calculators
Estimates only — check quantities with your supplier and local building code before you order.