Area Calculator — Calculate Area of 2D Shapes
Calculate the area of rectangle, triangle, circle, trapezoid, parallelogram, and ellipse. Results shown in square meters, square feet, and acres. See also our Area of Circle Calculator and Surface Area Calculator.
How to Calculate Area
- Select the shape from the dropdown menu.
- Enter the required dimensions in meters.
- Click Calculate to see the area in multiple units.
- The perimeter is also calculated automatically.
Formula
Rectangle: A = length × width
Triangle: A = ½ × base × height
Circle: A = π × r²
Trapezoid: A = ½ × (base₁ + base₂) × height
Parallelogram: A = base × height
Ellipse: A = π × a × bExample
Rectangle with length = 10 m and width = 5 m:
Area = 10 × 5 = 50 m²
= 538.20 ft² = 0.012355 acres
Perimeter = 2 × (10 + 5) = 30 m
Area Conversion Reference Table
| m² | ft² | Acres | Hectares |
|---|---|---|---|
| 1 | 10.76 | 0.000247 | 0.0001 |
| 10 | 107.64 | 0.00247 | 0.001 |
| 100 | 1,076.39 | 0.0247 | 0.01 |
| 1,000 | 10,763.91 | 0.247 | 0.1 |
| 4,047 | 43,560 | 1.000 | 0.405 |
| 10,000 | 107,639 | 2.471 | 1.000 |
Frequently Asked Questions
What units should I use for dimensions?
Enter dimensions in meters. The calculator converts the result to square feet and acres automatically. For other units, convert your measurements to meters first.
How do I calculate the area of an irregular shape?
Break the irregular shape into regular shapes (rectangles, triangles, etc.), calculate each area separately, then add them together.
What is the difference between area and perimeter?
Area measures the space inside a shape (in square units). Perimeter measures the total length of the boundary (in linear units).
How many square feet in an acre?
One acre equals 43,560 square feet or approximately 4,047 square meters.
What is the Ramanujan approximation for ellipse perimeter?
This calculator uses Ramanujan's approximation: P ≈ π(3(a+b) - √((3a+b)(a+3b))). It is accurate to within 0.04% for most ellipses.