Siding Calculator
Enter the house measurements to get the wall area and how many squares of siding to order.
Results are estimates for planning only. Always confirm measurements, local codes and manufacturer specs before ordering materials or quoting a job. See our Terms.
How to estimate siding
Wall area = perimeter x wall height. Each triangular gable adds width x height / 2. Subtract windows and doors (a typical window is about 15 sq ft, a door about 20). One square of siding covers 100 sq ft.
Add 10% waste for simple houses and up to 15% for many corners and openings. Vinyl siding usually comes about 2 squares per box; check the carton.
Questions
How many squares of siding for a 1,500 sq ft house?
It depends on wall area, not floor area. A typical two-story 1,500 sq ft home has about 1,600 to 2,000 sq ft of wall, or 16 to 22 squares with waste.
Do I include gables in siding measurements?
Yes. Each gable is a triangle: width x height / 2.
How much does siding cost per square?
Installed vinyl siding commonly runs about $400 to $800 per square, depending on product and region.