Surface Area of a Sphere Calculator SA = 4πr². Radius Surface area 314.16 Step-by-step with your numbers: 1. Values used: 2. Radius = 5 3. Surface area = 314.16 Did we solve your problem today? 👍 Yes 👎 No Thanks for the feedback! Sphere surface area. FAQ Volume? V = 4/3 π r³. Related calculators Sphere Calculator Find a sphere's volume and surface area. Sphere Volume Calculator V = 4/3 π r³. Hemisphere Calculator Volume and surface area of a hemisphere.