Calculate geometric volume and equivalent capacity for a box, cube, cylinder, sphere or cone. Select metres, centimetres or millimetres before entering dimensions.
Box = length × width × height. Cube = side³. Cylinder = πr²h. Sphere = 4πr³/3. Cone = πr²h/3. One cubic metre equals 1,000 litres; one cubic centimetre equals 1 millilitre.
A tank measuring 2 m × 1 m × 0.5 m has a geometric volume of 1 m³, or 1,000 L. A cube with 10 cm edges holds 1,000 cm³, or 1 L.
| Example | Volume calculation | Capacity |
|---|---|---|
| Rectangular tank: 60 × 30 × 40 cm | 60 × 30 × 40 = 72,000 cm³ | 72 L |
| Cube with 20 cm sides | 20³ = 8,000 cm³ | 8 L |
| Box: 1 × 0.5 × 0.4 m | 1 × 0.5 × 0.4 = 0.2 m³ | 200 L |
Use internal dimensions for capacity. Wall thickness, rounded corners and the fill level reduce usable capacity. 1 L = 1,000 cm³; 1 m³ = 1,000 L.
Use internal dimensions when estimating tank capacity. Walls, fittings and headspace reduce usable capacity. Dimensions are assumed exact and the solid is assumed ideal. A radius must not be confused with a diameter.
Divide the cubic-centimetre value by 1,000. For example, 25,000 cm³ is 25 L. Do not divide by 100 as you would for a simple length conversion.
It calculates an ideal geometric capacity from the entered dimensions. Use internal dimensions and subtract space occupied by fittings, slopes or required headspace for a usable estimate.
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English edition: 16 September 2026.