Square Footage Calculator
Calculate the square footage of a room or area from length and width measurements.
About the Square Footage Calculator
Square footage is the basic unit of measurement behind flooring, paint, tile, and real estate — this calculator finds it instantly from a length and width, with a square meter conversion for anyone working in metric.
How It Works
The calculator multiplies length by width directly to get the area in square feet, then multiplies that by the standard conversion factor to also show the equivalent in square meters.
Square Footage = Length × Width; Square Meters = Square Footage × 0.092903.
Example
Scenario: A room measuring 12ft by 10ft.
Result: 120 square feet, or about 11.15 square meters.
Assumptions & Limitations
- Assumes a simple rectangular area — for irregular or multi-part rooms, break the space into rectangular sections and add the results together.
- Does not account for room features like closets, alcoves, or curved walls — measure each distinct rectangular section separately for accuracy.
Frequently Asked Questions
How do I measure an L-shaped room?
Split the L-shape into two separate rectangles, calculate the square footage of each individually, then add the two results together for the total area.
Why does real estate square footage sometimes not match my own measurement?
Listed square footage can include or exclude certain spaces (like garages, unfinished basements, or porches) depending on local measurement standards, which is why self-measured totals sometimes differ from listing figures.
How many square feet are in an acre?
One acre equals 43,560 square feet, a standard land measurement conversion useful for larger outdoor projects.