Siding Calculator

Estimate siding squares for exterior walls.

Siding squares (sq) 13.2

With waste 1,320

Formula: squares = area × (1 + waste) ÷ 100

Step-by-step with your numbers:

1. Values used:

2. Wall area = 1,200

3. Waste = 10 %

5. Siding squares = 13.2sq

6. With waste = 1,320

Did we solve your problem today?

Siding is sold by the 'square' (100 ft²). Estimate how many you need.

The math behind it

squares = wall area × (1 + waste) ÷ 100.

1,200 ft² + 10% → 13.2 squares.

Subtract windows?

For large openings, yes; small ones are usually left in as allowance.