How this calculator works
A fast area calculator for rectangular spaces. Use it as the first step for flooring, paint, tile, landscaping and many other home projects.
Area = length × width.
Example
A 12 × 10 ft room is 120 square feet.
How to get a better estimate
- Split L-shaped areas into rectangles and add them together.
- Use the same units for both dimensions.
- Measure finished surfaces when estimating finish materials.
What the result means
The result is a planning estimate. Dimensions, coverage, density, packaging and installation conditions vary by product and project. For purchasing, compare the result with the exact product label or supplier specification. For structural, electrical, code-regulated or safety-critical work, use an appropriately qualified professional.
Common questions about the Square Footage Calculator
What does this calculator estimate?
A fast area calculator for rectangular spaces. Use it as the first step for flooring, paint, tile, landscaping and many other home projects.
What formula does it use?
Area = length × width.
How should I use the result?
Use it as a planning estimate, then verify the dimensions and replace editable defaults with the specifications for the product or service you actually intend to buy.
Reference tables
Want a fast benchmark without changing inputs? These static tables use the same published calculation method.