Siding Calculator
Updated Formulas shown
Siding is sold by the square (100 ft²). A house with a 160 ft perimeter, 9 ft walls and 200 ft² of gables, minus 250 ft² of doors and windows, needs about 15.3 squares with 10% waste.
Siding squares
15.3
1 square = 100 ft²
- Wall area to cover
- 1,390 ft²
- Area to buy (incl. waste)
- 1,529 ft²
- Vinyl boxes (≈ 2 squares each)
- 8
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Frequently asked questions
How much does new siding cost?
Roughly $4–$8 per ft² installed for vinyl and $7–$14 for fiber cement in 2026, before trim and removal.
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Estimates only. Check quantities with your supplier or contractor before ordering.