📦 Volume Calculator
Volume tells you how much three-dimensional space a shape occupies — essential for shipping boxes, mixing concrete, sizing water tanks or filling a pool. Pick the shape below and enter its measurements.
All dimensions must use the same unit: if length is in centimetres, the volume comes out in cubic centimetres. Mixing units (metres with centimetres) is the classic volume mistake.
How to use this calculator
Choose the shape card - rectangular box, cylinder or sphere - and enter its measurements. Every card returns the volume instantly.
- Pick the right card for your shape: Rectangular box, Cylinder or Sphere.
- Fill in the card's fields, such as Length, Width and Height for the box, or Radius and Height for the cylinder.
- Keep all measurements in the same unit - mixing metres and centimetres is the classic volume mistake.
- Press Calculate and read the volume; adjust a dimension and recalculate to plan different sizes.
Frequently asked questions
Which shapes does this volume calculator cover?
The page covers three solids: a rectangular box from length, width and height; a cylinder from radius and height; and a sphere from radius alone. Each shape is a separate card with its own fields.
What formulas does it use?
The box multiplies length times width times height; the cylinder uses pi times radius squared times height; the sphere uses 4/3 times pi times radius cubed.
Can you show a worked example?
On the box card, enter length 2, width 3 and height 4: 2 * 3 * 4 = 24 cubic units of volume.
What is the most common volume mistake?
Mixing units, such as entering length in metres and height in centimetres. The result inherits the cube of whatever unit you enter, so centimetre inputs give cubic centimetres - measure every side in the same unit first.