How to use the Square Footage Calculator
This tool calculates the area of a room or lot and converts it between units.
Open the Square Footage Calculator →
What you need to enter
- Length
- Width
- Unit
The formula
Area = length × width, converted to square feet, metres, yards and acres.
Worked example
Using the default values in the calculator:
- Length: 20
- Width: 15
- Unit: Feet
| Square feet | 300 |
| Square metres | 27.871 |
| Square yards | 33.333 |
| Acres | 0.006887 |
Tips for better results
- Break complex shapes into rectangles.
- Measure twice.
Common mistakes to avoid
- Mixing units.
- Forgetting alcoves.
Please note: Results are estimates for general use. For safety-critical work such as electrical or building projects, check with a qualified professional and local codes. See our Disclaimer.