Question 1

What is the formula for the volume of a cylinder?

Accepted Answer

The volume of a right circular cylinder is V = π × r² × h, where r is the radius of the base and h is the height. For example, a cylinder with radius 3 and height 10 has volume π × 9 × 10 ≈ 282.74 cubic units.

Question 2

How do I calculate the volume of a hollow cylinder?

Accepted Answer

For a hollow cylinder (tube/pipe), the volume is V = π × (R² - r²) × h, where R is the outer radius, r is the inner radius, and h is the height. This gives the volume of the material between the inner and outer walls.

Question 3

What units should I use?

Accepted Answer

You can use any length unit (mm, cm, m, in, ft, etc.) for radius and height. The volume will be in the corresponding cubic unit (mm³, cm³, m³, in³, ft³). The calculator also converts to liters and gallons for convenience.

Question 4

What is the difference between surface area and volume of a cylinder?

Accepted Answer

Volume measures the 3D space inside the cylinder (V = πr²h), measured in cubic units. Surface area measures the total area of all faces including the curved side and two circular bases, measured in square units.

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