Square Footage Calculator
Multiply length by width, in feet, to get square footage. For irregular spaces or multiple rooms, split the area into rectangles, calculate each separately, and add the results together.
Quick Answer
Multiply length by width, in feet, to get square footage. For irregular spaces or multiple rooms, split the area into rectangles, calculate each separately, and add the results together.
Square Footage Calculator
Enter length and width in feet for one or more identical areas to get total square footage, plus square yards and square meters.
Enter your values and click calculate.
How to Use This Calculator
Measure wall to wall for interior rooms, or edge to edge for outdoor areas.
This gives the square footage of one rectangular area.
Split an L-shaped or oddly-shaped room into two or more rectangles, calculate each, and add them together.
Divide by 9 for square yards, multiply by 0.0929 for square meters, or divide by 43,560 for acres.
Formula
Area (sq ft) = Length (ft) x Width (ft), summed across all sections for irregular spaces.
Quick Unit Conversions
| From | To | Multiply by |
|---|---|---|
| Sq ft | Sq yd | 0.1111 |
| Sq ft | Sq m | 0.0929 |
| Sq ft | Acres | 0.0000230 |
| Sq yd | Sq m | 0.8361 |
Common Mistakes to Avoid
- Mixing inches and feet in the same calculation without converting first.
- Forgetting to add up multiple rooms or sections for a whole-house estimate.
- Not splitting an irregular or L-shaped room into rectangles before calculating.
- Measuring only interior wall-to-wall on some rooms and including closets/alcoves inconsistently on others.
When the Estimate May Be Wrong
This calculator assumes simple rectangular sections. Curved walls, bay windows, and highly irregular layouts need a more detailed room-by-room sketch and measurement, and any material order should include the waste buffer appropriate to that specific material (flooring, paint, tile, etc.).
FAQs
How many square feet are in a square yard?
There are 9 square feet in one square yard.
How do I measure an irregular-shaped room?
Break the room into two or more rectangles, calculate the square footage of each, and add them together.
What’s the difference between square footage and floor area for a home listing?
Real estate listings sometimes include or exclude certain spaces (garages, unfinished basements) by local convention — always check what’s included when comparing sources.
Sources and Methodology
Conversion factors (9 sq ft per sq yd, 0.0929 sq m per sq ft, 43,560 sq ft per acre) are standard, fixed unit-conversion constants.
