How this calculation works
Total the square footage of one or more rectangular spaces. The result is calculated locally in your browser from the visible inputs, and the method below remains available for checking.
Worked example
A 12 × 10 foot room contains 120 square feet.
Assumptions and limits
- Inputs use the units shown beside each field.
- Intermediate values retain precision; displayed values are rounded for readability.
Questions people ask
How does the Square Footage Calculator work?
It applies this displayed method: Square footage = length in feet × width in feet × quantity. Values stay in your browser and are not submitted to a server.
What should I check before using the Square footage result?
Inputs use the units shown beside each field. Intermediate values retain precision; displayed values are rounded for readability. Quantities are planning estimates. Site conditions, product sizes, workmanship and structural specifications require professional verification.
Does this Square footage calculator save my information?
No. Calculation inputs are processed on this device. Sharing creates a URL only when you choose the share action.