Basic Sphere Properties Calculator
PHP Program by Jay Tanner of Waterloo, NY, USA
Enter any ONE of the four spherical properties (R, C, A or V) and this program will compute the other three unknown properties.

The units of measure can be interpreted as anything, such as meters, inches, miles, feet, etc., whatever units you decide the numerical values represent.
 R = Radius  
unit(s)
 C = Circumference  
unit(s)
 A = Area of Surface  
square unit(s)
 V = Volume  
cubic unit(s)
  

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The Basic Spherical Elements

The Relevant Spherical Equations
Jay Tanner - 2025