Sphere Surface Area Calculator
Calculate how much surface a sphere has by entering its radius. The 4πr² formula helps estimate material for coating, wrapping, or painting spherical objects.
Surface Area
Enter values to calculate
How to Use the Sphere Surface Area Calculator
1
Enter the sphere's radius.
2
Press Calculate for the surface area.
3
Review the result in square units.
Frequently Asked Questions
What is the surface area formula for a sphere?
Surface Area = 4πr². It gives the total outer area of the sphere.
How does surface area relate to volume?
Surface area grows with r² while volume grows with r³, so larger spheres have proportionally less surface per unit volume.
Can I use diameter instead of radius?
Divide the diameter by 2 to get the radius, then enter that value.