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Math Formulas > Geometry > Surface Area of a Sphere

Surface Area of a Sphere

r: radius
d: diameter

The surface area of a sphere is given by:
SA = 4 ∙ Π ∙ r2

Π defines the ratio of any circle's circumference to its diameter and is approximately equal to 3.141593, however the value 3.14 is often used.

Example: determine the surface area of a sphere that is 3 meter in diameter.

r = d/2 = 1.5 m

SA = 4 ∙ Π ∙ r2 = 4 ∙ 3.14 ∙ 1.52 = 28.26 m2

Online Surface Area Calculator, click on the link will open a new window.

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Surface Area of a Sphere

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