Estimate how many squares of siding your home needs. Each dimension has its own unit selector (in/ft/yd/m).
Siding is sold by the square (100 sq ft of wall). Measure each wall (length times height, any unit), subtract large openings if you wish, and divide by 100. Add 10% for waste, or more for homes with many corners and gables. Order trim and corner posts separately.
Use the siding calculator to estimate squares or boxes from exterior wall area. It helps plan material quantity before final deductions, trim packages and accessory counts are confirmed.
Start with the calculator that matches how your material is sold: area, length, volume, count, weight or electrical load. Enter one work area at a time, use the unit selector beside each measurement, then review the order quantity and cost fields before comparing supplier quotes.
Most calculators can save the current estimate in your browser, reload named estimates, print a copy, switch to dark mode or create a shareable link. Those tools are intended for planning and communication; always confirm final quantities, coverage rates, density, code requirements and pricing with the supplier or contractor responsible for the work.