Calculate the volume of a sphere instantly with this free interactive 3D calculator. The formula is V = (4/3)πr³, where r is the radius of the sphere. Enter your radius in the panel and watch the 3D model scale in real time — volume and surface area are computed as you adjust.

Use this tool for real-world calculations: find the volume of a ball (basketball, soccer ball), estimate planetary volumes, calculate the air inside a balloon, or determine the capacity of spherical water tanks. For example, a sphere with radius 10 cm has a volume of approximately 4,189 cm³ (about 4.19 liters).

Need help understanding the math? The built-in AI chat assistant can walk you through the derivation, explain why the 4/3 factor appears, or help you solve geometry problems involving spheres.

Volume of a Sphere Calculator