The first way to calculate area is to use the circle area calculator above.
Calculate Area Using Diameter. Use this circle calculator to find the area, circumference, radius or diameter of a circle. This tool will calculate the area of a circle from the diameter, and will convert different measurement units for diameter and area.
Circle Area Circumference Or Radius Calculator from getcalc.com
Enter the radius, diameter, circumference or area of a circle to find the other three. But then if you are trying to calculate the area of a circle, you seem to have gotten the formula wrong. This tool will calculate the area of a circle from the diameter, and will convert different measurement units for diameter and area.
In order to calculate the area of a circle you need to know its diameter or radius.
In the result you will get all unknown variables presented. You can use numerous different inputs and choose to submit the radius, the diameter or the circumference of the circle. Enter any single value and the other three will be calculated. This tool can use a variety of metric and imperial units for lengths and area.
