Area Calculator
Calculate the area of common geometric shapes including rectangles, circles, triangles, and trapezoids. Convert results instantly to square feet, square meters, and acres.
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Area Formulas
Understanding how to calculate area is essential for construction, landscaping, and home improvement projects. This Area Calculator uses standard geometric formulas to find the surface area of 2D shapes.
- Rectangle: Area = Length × Width
- Circle: Area = π × r²
- Triangle: Area = ½ × Base × Height
- Trapezoid: Area = ½ × (Base1 + Base2) × Height
- Ellipse: Area = π × Radius1 × Radius2
Real World Uses
- Flooring & Carpeting: Measure your room in feet or meters to find the total square footage needed. Always add 10% for waste.
- Landscaping: Calculate the area of a garden bed or lawn to estimate soil, mulch, or fertilizer requirements (often in square feet or acres).
- Painting: Determine wall surface area to know how many gallons of paint to buy.
For 3D calculations like concrete pours or tank capacity, check out our Volume Calculator.
? Frequently Asked Questions
To find square footage, simply multiply the length in feet by the width in feet. If your measurements are in inches, divide the result by 144.
One acre contains 43,560 square feet.
Break the shape down into simpler parts (rectangles and triangles), calculate the area of each part, and add them together.