Square Footage Calculator
Calculate area for rectangle, square, circle, triangle, trapezoid, and ellipse. Multiple length and area units with step-by-step solutions.
Calculate Area
Select a shape, enter measurements, choose units, and click Calculate Area to see the result with step-by-step solution.
Result
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Step-by-Step Solution
Complete User Guide
What is Square Footage?
Square footage is a measurement of area expressed in square feet. It is widely used in real estate, construction, flooring, painting, and property valuation. This calculator supports 6 shapes and converts between ft², m², yd², in², acres, and hectares.
6 Supported Shapes
Rectangle
A = L × W
Square
A = s²
Circle
A = πr²
Triangle
A = ½bh
Trapezoid
A = ½(b₁+b₂)h
Ellipse
A = πab
Common Conversions
| From | To | Multiply by |
|---|---|---|
| 1 ft² | m² | 0.0929 |
| 1 m² | ft² | 10.764 |
| 1 yd² | ft² | 9 |
| 1 acre | ft² | 43,560 |
| 1 hectare | m² | 10,000 |
| 1 hectare | acres | 2.471 |
Important Notes
- Use consistent units for all measurements.
- For irregular shapes, divide into regular shapes and add.
- Measure accurately — small errors multiply in area.
- Results in all 6 units are shown after calculation.