Formula and calculation method
Rectangle area = length × width. One square foot = 0.09290304 m².
Use consistent units for all comparable inputs. The displayed result is rounded; arithmetic is performed with the full available numeric precision. Check your source measurements before relying on the result.
How to use square footage calculator
- Set Length. The example below uses 10.
- Set Width. The example below uses 12.
- Set Input unit by choosing the option that matches your calculation.
- Select Calculate to update the result. Reset restores the illustrated inputs. Copy, print or download your own result if you need a record.
Worked example
Example inputs
- Length
- 10
- Width
- 12
- Input unit
- Feet
- Square feet
- 120
- Square meters
- 11.1483648
Factors affecting your result
Use consistent units for all comparable inputs. The displayed result is rounded; arithmetic is performed with the full available numeric precision. Check your source measurements before relying on the result.
Changing length changes the scenario being evaluated. Adjust one input at a time when comparing results, keep a copy of the assumptions, and compare values using the same unit and period. A precise arithmetic result does not make an uncertain assumption precise.
Frequently asked questions
How does the square footage calculator work?
Rectangle area = length × width. One square foot = 0.09290304 m².
What inputs does Square Footage Calculator need?
Enter length, width, input unit. Choose values that correspond to the same situation and measurement convention.
How should I interpret the square footage calculator result?
Use consistent units for all comparable inputs. The displayed result is rounded; arithmetic is performed with the full available numeric precision. Check your source measurements before relying on the result.
Are my square footage calculator inputs uploaded?
No. The calculation runs in this browser. Favorites, recent tool names, theme and formatting preferences may be saved locally, but calculation inputs are not sent to a calculation server or stored by this website. Shared links do not include entered values.
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