Circle Calculator allows you to calculate radius, diameter, perimeter, and area given any value.

Built-in unit converter makes it a snap to calculate and convert from any length or area units.

Simply enter one of the parameters (i.e. radius, diameter, perimeter/circumference, or area) and the other three are instantly computed.

For example, this circle calculator allows you to quickly answer questions such as: The radius of a circle is 5 inches. What is the area in meters? (0.0507 m^2)

Answer circle related homework problems with ease.