Calculate Circle Area Online

Looking for a way to calculate the area of a circle online? On this page we share a circle area calculator that can be used just by inputting the Radius value.

Instructions on how to get the Ray

To get the value of the radius of a circle, it is usually necessary to measure the distance from the center of the circle to any point on the edge (circumference) of the circle. You can also measure the distance from one end of the circle to the other straight edge, and divide that value to get the radius.

The radius value can be measured in any unit of length, such as centimeters (cm), meters (m) or kilometers (km), depending on the system of units used.

When using the circle area calculator we created, make sure you enter the radius value in the correct unit. For example, if the radius value was measured in centimeters, you would enter the value in centimeters. If the radius value was measured in meters, you must enter the value in meters. If the radius value was measured in kilometers, you must enter the value in kilometers.

If you are unsure of the unit in which the radius is measured, it is a good idea to check the unit in which other related dimensions or measurements are given. For example, if you have an image of the circle with the width and height given in centimeters, chances are the radius will also be measured in centimeters.

In general, it is important to be aware of the units of measurement used in a given context and to make sure that all measurements entered into the calculator are in the same unit.

Circle Area Calculator

How does the Circle Area Calculator work?

A circle area calculator works based on the mathematical formula for calculating the area of a circle, which is given by:

A = πr²


  • A is the area of the circle
  • π is the mathematical constant Pi, approximately equal to 3.14159265359…
  • r is the radius of the circle

To calculate the area of a circle, just enter the radius value in the calculator form and press the “Calculate” button. The program then uses the above formula to calculate the area of the circle and displays the result on the screen.

Calculate area of a circle

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