Circle Calculator helps you to find the area and perimeter of circle knowing its radius. Calculate the area and perimeter of Circle Online.
Circle Calculator
Circle Calculator used to calculate the Area and Perimeter of a circle whose radius or diameter is known to us.
Radius =  
Answer :  

How to Use Circle Calculator
The use of the above calculator is quite easy. You can use it for the Calculation of Area of Circle and Perimeter (Circumference) of Circle.
Area of Circle : To use the above calculator for finding area of a circle please select the option “Area” in the drop down menu of the column “Choose a Calculation”.
Perimeter of Circle : To use the above calculator for finding Perimeter of a circle please select the option “Perimeter” in the drop down menu of the column “Choose a Calculation”.
Now enter the value of Radius of the circle and then click on calculate button. The answer will be displayed in the answer block and the step by step solution is also given in the Solution block.
Formulas Used
In the above calculator following formulas have been used :
Area of Circle : pi * radius * radius
Perimeter of Circle : 2 * pi radius
FAQs
Q. What is the area of a circle ?
Ans. Area of Circle is given by the following formula
pi * radius * radius