Area Calculator
Calculate the area and perimeter of circles, rectangles, squares, triangles, trapezoids, and parallelograms.
An Area Calculator helps you quickly find the area of common geometric shapes without doing manual calculations. This free online calculator supports shapes such as circle, rectangle, square, triangle, trapezoid, and parallelogram.
Simply select the shape, enter the required dimensions, and click Calculate Area. The tool instantly provides the calculated area and, where applicable, the perimeter or circumference.
What Can You Calculate With This Area Calculator?
This calculator is designed for several commonly used geometric shapes:
- Circle: Enter the radius to calculate its area and circumference.
- Rectangle: Enter length and width to find the area and perimeter.
- Square: Enter the side length to calculate the area and perimeter.
- Triangle: Enter the base and height to calculate the area.
- Trapezoid: Enter both parallel bases and the height to calculate its area.
- Parallelogram: Enter the base and height to determine its area.
How to Use the Area Calculator
Using the calculator is straightforward:
- Select the geometric shape you want to calculate.
- Enter the required measurements.
- Click Calculate Area.
- View the area and available perimeter or circumference result.
Make sure your measurements use the same unit, such as centimeters, meters, inches, or feet. The calculator reports the result in corresponding square units. Area Calculator Formulas Different shapes use different formulas.
For example, the area of a rectangle is calculated from its length and width, while a circle’s area depends on its radius. For a triangle, the area is based on its base and height: