What this calculator actually models
Square footage is an area measurement, not a length. The correct formula depends on the shape, and every dimension must use a consistent unit before the area is calculated.
How to use this calculator
Choose the shape that matches the space.
Enter the requested dimensions in feet.
Optionally enter a cost per square foot to estimate a simple material amount.
Where people use it
- •Flooring and room planning
- •Paint, tile and finish takeoffs
- •Checking plan or site areas before ordering material
Example: 12 ft × 16 ft room
A rectangular 12 ft by 16 ft room has an area of 192 sq ft. At 10% material waste, a downstream material estimate would be based on 211.2 sq ft rather than 192 sq ft.
Assumptions and limits
- •Irregular rooms should be split into simple shapes and added together.
- •Cost per square foot is a simple multiplication and does not include labor, taxes, waste or supplier-specific pricing unless you add those separately.
Frequently asked questions
How do I calculate square feet?+
For a rectangle, multiply length in feet by width in feet.
Can I use inches directly?+
Convert inches to feet first by dividing by 12, or use a length converter before applying the area formula.
Is square footage the same as linear feet?+
No. Square feet measure area while linear feet measure length.
Semantic next steps
Continue the calculation
These links move to a different input, formula or project stage rather than a keyword variation of this page.
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