`A = 4 pi * "r" ^2`

Enter a value for all fields

The Surface Area of a Sphere calculator  computes the surface area of a sphere based on its radius (r).

INSTRUCTIONS: Choose units and enter the following:

• (r) the radius of the sphere.

Sphere Surface Area (A): The Surface Area of the Sphere is returned in square meters (m²).  However, this can be automatically converted into other area units (e.g. square feet, acres) via the pull-down menu.

The Math/Science

The formula for the surface area of a sphere is:

        A = 4π•r²

where:

• A is the surface area of the sphere
• r is the radius of the sphere

 Sphere Calculators:

• Sphere Surface Area based radius (r)
• Sphere Surface Area from Volume
• Sphere Volume based radius (r)
• Sphere Volume from Circumference
• Sphere Volume from Surface Area
• Sphere Volume from Mass and Density
• Sphere Radius from Volume
• Sphere Radius from Surface Area
• Sphere Weight (Mass) based on volume and mean density (mD)
• Sphere Density
• Area of Triangle on a Sphere
• Distance between Two Points on a Sphere
• Sphere Cap Surface Area
• Sphere Cap Volume
• Sphere Cap Weight (Mass) 
• Sphere Segment Volume
• Sphere Segment Weight (Mass)
• Sphere Segment Wall Surface Area (without the circular top and bottom ends)
• Sphere Segment Full Surface Area  (with the top and bottom circles, aka ends)
• Volume of Spherical Shell
• Mass of Spherical Shell

References

• Light and Matter(Dr. Benjamin Crowell) Chapter 1.4 Order of Magnitude Estimates