Siding Calculator
Siding is sold by the square (100 ft² of coverage). Enter the wall dimensions, deduct windows and doors, and get squares, boxes and trim length estimates with waste.
Siding Calculator
Roofing & Exterior
ft
ft
ft²
ft²
ft²
%
Boxes to buy
12boxes · 100 ft² each
Coverage area
11.66squares
1,166 ft² incl. waste
Net wall area
1,060 ft² · 98.5 m²
Corner posts
14× 10 ft (4 corners min)
Starter strip / J-channel
12× 12 ft lengths
Calculation breakdown
- 1Gross walls:
42.7 × 2.59 = 110.6 m² - 2Net:
− 12.1 openings + 0 gables = 98.5 m² - 3Boxes:
⌈108.3 ÷ 9.29⌉ = 12
Net wall area = (Perimeter × Height) − Openings.
Squares = Net area × (1 + Waste) ÷ 100 ft² · Boxes = ⌈Squares × 100 ÷ box coverage⌉.