Radius of a Sphere Calculator r from volume. Volume Radius 4.998 Step-by-step with your numbers: 1. Values used: 2. Volume = 523 3. Radius = 4.998 Did we solve your problem today? 👍 Yes 👎 No Thanks for the feedback! r = ³√(3V/4π). FAQ Surface? From SA: r = √(SA/4π). Related calculators Sphere Calculator Find a sphere's volume and surface area. Sphere Volume Calculator V = 4/3 π r³. Radius of a Circle Calculator r from circumference or area.