The Radius of a Sphere from the Surface Area calculator computes the radius (r) based on the surface area of a sphere (SA). 
INSTRUCTIONS: Choose units and enter the following:
- (SA) Volume of Sphere.
Sphere Radius (r): The radius is returned in meters. However, this can be automatically converted to other length units (e.g. feet) via the pull-down menu.
The Math
The equation for the surface area of a sphere is as follows:
If we solve for the radius (r), we have the formula for the radius of a sphere based on the surface area which is:
`r = sqrt( (SA) / (4π) )`
where:
- r is the radius of the sphere
- SA is the surface area.
Sphere Calculators
- Sphere Surface Area based radius (r)
- Sphere Surface Area from Volume
- Sphere Volume from Radius
- 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) from volume and density
- 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
