Square Footage Calculator
Convert length × width into square feet, with optional extra rooms and waste. Click any i for detail.
Dimensions
Length (ft)
i
Length
Longer side of the rectangle in feet. |
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|---|---|
Width (ft)
i
Width
Shorter side of the rectangle in feet. |
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Rooms / repeats
i
Rooms
Identical rectangles (rooms, slabs, rugs). |
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Waste (%)
i
Waste
Extra material for cuts and mistakes. Flooring often 5–10%. |
How to use this calculator
- Enter length and width in feet.
- Multiply rooms if they are the same size.
- Add waste % if you are ordering material.
- Read net area and area with waste.
Results explained
The headline includes waste. Net area is length × width × rooms. Waste is a percentage adder for cuts.
Quick reference: area
Common takeoff conversions.
| Item | Detail |
|---|---|
| 1 sq yd | 9 sq ft |
| 1 sq m | ≈ 10.76 sq ft |
| Typical flooring waste | 5–10% |
| Tile on diagonal | Often 15%+ waste |
Irregular rooms: split into rectangles and add the results.
How the estimate is built
Area = L × W × rooms. With waste = area × (1 + waste%).
Example scenario
A 12×10 ft room with 10% waste is 120 sq ft net and 132 sq ft to order.
FAQ
Can I mix feet and inches?
Convert inches to feet first (3 in = 0.25 ft), or use decimal feet.
What about L-shaped rooms?
Split into two rectangles and run the calculator twice, then add.
Is this the same as cubic feet?
No. Square footage is area (2D). Cubic feet is volume (3D).