Area of a Circle Calculator

Calculate the area of a circle using its radius

Input Parameters

Calculation Results

Calculation Formula

Area = π * r²

Where:
π (pi) is a mathematical constant approximately equal to 3.14159
r is the radius of the circle

Area of a Circle Calculator Usage Guide

Learn how to use the Area of a Circle Calculator and understand its working principles

How to Use

  1. Enter the radius of the circle in the input field. The radius is the distance from the center of the circle to any point on its edge.
  2. Click the "Calculate" button to compute the area.
  3. The calculated area will be displayed in the result field.
  4. Use the "Reset" button to clear all input fields and results.

Understanding the Formula

The area of a circle is calculated using the formula: Area = π * r²

Where:

  • π (pi) is a mathematical constant approximately equal to 3.14159
  • r is the radius of the circle

Example

If the radius of a circle is 5 units, the area would be:

Area = π * 5² = π * 25 ≈ 78.5398 square units