Sphere Volume Calculator
Calculate the volume of a sphere from its radius — type a value and get the result instantly.
Formula
V = 4⁄3 · π · r³
where r is the radius of the sphere
About the Sphere Volume Calculator
A sphere is a 3D shape where every point on the surface is the same distance from the center. That distance is the radius, and it fully defines the sphere's size.
To find the volume of a sphere, cube the radius, then multiply by π and by 4⁄3. This is useful for balls, tanks, droplets, and physics problems.
All calculations run instantly and locally in your browser — nothing is uploaded, keeping your numbers completely private.
Benefits
Instant result
The volume updates as soon as you enter the radius.
Accurate π
The calculation uses the precise value of π, so the result is as exact as possible.
Fully private
The calculation happens locally in your browser; your numbers never leave your device.
Frequently Asked Questions
How do you calculate the volume of a sphere?
Cube the radius, then multiply by π and by 4⁄3: V = 4⁄3·π·r³. For example, a radius of 3 cm gives a volume of about 113.1 cm³.
What is the formula for the volume of a sphere?
The sphere volume formula is V = 4⁄3·π·r³, where r is the radius of the sphere and π ≈ 3.14159.
What if I know the diameter instead of the radius?
The radius is half the diameter: r = d/2. Find the radius first, then plug it into the formula.
What is the difference between a sphere and a ball?
A sphere is just the surface, while a ball is the whole solid including the inside. Volume is calculated for the solid (the ball).
What units does the volume come out in?
Volume is measured in cubic units. If you entered the radius in centimeters, the result is in cubic centimeters (cm³).