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Circle And Sphere Area Calculator

This calculator requires the use of Javascript enabled and capable browsers. This calculator is designed to give all of the mathematical values of a circle and sphere from only one entered data value. Enter any of the four circle values, area, radius, diameter or circumference, click on Calculate and the other three values are returned in full (up to 18 decimal places) and maximum 3 decimal place rounded values. Also, assuming the same radius and diameter for a sphere, the surface area and volume of that sphere are returned. You may click on Clear Values to do another calculation.

The formulas are as follows:
area = PI * (radius) * (radius) or
area = PI * (diameter / 2) * (diameter / 2)
radius = (diameter / 2) or
radius = sqrt(area / PI)
diameter = 2 * radius or
diameter = circumference / PI
circumference = PI * diameter or
circumference = PI * (radius * 2)
sphere surface area = 4 * PI * (radius * radius)
sphere volume = 4/3 * PI * (radius * radius * radius)

Other area and volume calculators

Circular Calculations
Enter Any One Circle Value
Factor Entry And Result Value Rounded Result Value
Circle Area
Circle Radius
Circle Diameter
Circle Circumference

Sphere Calculated Results
Factor Result Value Rounded Result Value
Sphere Radius
Sphere Diameter
Sphere Surface Area
Sphere Volume
Updated: 7/2/11

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