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`r = sqrt(( "SA" )/(4*pi)) `

Enter a value for all fields

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 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 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