House Area Calculator

Calculate total house square footage including additions and optional garage space. For a single room measurement, try our Room Area Calculator.

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Square Footage Floor Area Wall Area Ceiling Area
Total House Area: —
Formula:
Total Area = (Main L × W) + (Addition L × W) + (Garage L × W)
Example:
40×30 = 1,200 ft²
20×15 addition = 300 ft²
20×20 garage = 400 ft²
Total = 1,900 ft²
Related Calculators:
Square Footage Floor Area Room Area Wall Area

Frequently Asked Questions

Should I include the garage in square footage?

Some listings exclude garages from living area square footage.

Does this work for irregular houses?

Yes. Break the house into rectangular sections and add them together.

What unit is the result shown in?

The primary result is displayed in square feet (ft²).