Sphere Volume Calculator
Calculate the volume of a sphere from its radius.
The space inside a ball
A sphere's volume is the space it encloses, found from its radius. This calculates it, useful for anything spherical from a ball to a tank to a planet, using the constant pi.
Enter the radius to find the sphere's volume.
Why sphere volume grows so fast
The sphere volume formula involves the radius cubed, which has a striking consequence: because volume depends on the cube of the radius, doubling the radius multiplies the volume by eight. This is why a slightly bigger ball holds dramatically more, and why the relationship between a sphere's size and its capacity is so non-intuitive — a small increase in radius is a large increase in volume. The sphere is also mathematically special as the shape that encloses the most volume for the least surface area, which is why bubbles, droplets and planets are spherical: nature minimises surface for a given volume, and the sphere is the perfect answer. From the smallest droplet to the largest star, the same formula and the same cubic scaling apply, connecting the geometry of a ball to the shape of the cosmos.
Frequently asked questions
Why does doubling a sphere's radius multiply its volume by eight?
Because volume depends on the radius cubed — doubling the radius means two cubed, which is eight times the volume.
Why are bubbles and planets spherical?
The sphere encloses the most volume for the least surface area, so nature forms spheres wherever surface is minimised for a given volume.
Is anything uploaded?
No. The calculation happens in your browser.