Complete guide
Volume calculator for boxes, cubes, cylinders, cones and spheres
Select a shape and enter its required dimensions in one consistent unit. Calculator24 reports volume, surface area and the exact formula used.
Choose the solid
Rectangular solids use length, width and height. Cubes use one side. Cylinders and cones use radius and height; spheres use radius.
Volume formulas
Volume counts three-dimensional space and therefore uses cubic units.
box=lwh; cube=s³cylinder=πr²h; cone=πr²h/3; sphere=4πr³/3Surface area
Surface area covers the outside faces and uses square units. The result includes closed top and bottom surfaces.
Use consistent units
Convert every length before calculating. Mixing centimeters and meters would multiply the error across dimensions.
Capacity versus material
Geometric volume does not subtract wall thickness. For container capacity, enter internal dimensions; for exterior material, use outer dimensions and a dedicated fabrication estimate.
Required dimensions
| Solid | Dimensions |
|---|---|
| Box | length, width, height |
| Cube | side |
| Cylinder | radius, height |
| Cone | radius, height |
| Sphere | radius |
Frequently asked questions
What units does volume use?
The cube of the input unit, such as cm³ or ft³.
What is cylinder volume?
π times radius squared times height.
Is diameter the same as radius?
No. Radius is half the diameter.
Does surface area include every face?
Yes, the formulas model closed solids.
Can I mix units?
No. Convert all dimensions to the same unit first.
What to keep in mind
Use one consistent length unit for every dimension. Irregular objects require another measurement method.
Results display up to 8 decimal places; exported numbers preserve calculation precision. This is a calculation summary, not an official certificate.