Volume Calculator
Calculate volume of any 3D shape with automatic metric/imperial and litre/gallon conversions.
Key formulas: Sphere = (4/3)πr³ · Cylinder = πr²h · Cone = (1/3)πr²h · Cube = s³. Conversions: 1 m³ = 1,000 L; 1 US gal = 3.785 L; 1 UK gal = 4.546 L.
Volume Units by Country
| Country | Volume unit | Liquid volume | Fuel economy |
|---|---|---|---|
| 🇺🇸 USA | in³ / ft³ | US fl oz / US gal | miles per US gallon |
| 🇬🇧 UK | cm³ / m³ | fl oz / UK gal | miles per UK gallon |
| 🇨🇦 Canada | cm³ / m³ | litres (L) | L/100 km |
| 🇦🇺 Australia | cm³ / m³ | mL / L | L/100 km |
| 🇩🇪 Germany | cm³ / m³ | mL / L | L/100 km |
| 🇯🇵 Japan | cm³ / m³ | mL / L | km/L or L/100 km |
Note: A US gallon (3.785 L) ≠ UK gallon (4.546 L). US mpg and UK mpg are not interchangeable — UK mpg appears ~20% better.
Frequently Asked Questions
How do you calculate the volume of a sphere?
V = (4/3)πr³. For r = 5 cm: V = (4/3) × π × 125 ≈ 523.6 cm³ = 523.6 mL ≈ 0.524 litres.
What is the difference between US and UK gallons?
US gallon = 3.785 litres; UK (imperial) gallon = 4.546 litres. The UK gallon is 20% larger. This is why UK fuel economy figures (mpg) look better than US figures even for the same car.
How many cm³ are in a litre?
1 litre = 1,000 cm³ = 1,000 mL. This exact relationship is the basis of the metric system. A 1 L water bottle has the same volume as a 10 cm × 10 cm × 10 cm cube.
How is volume taught differently around the world?
In the US, cubic inches and fluid ounces are taught alongside metric. In the UK, metric (cm³, litres) is primary but pints still appear in everyday use. Japan and most of Europe use metric exclusively. India uses a mix of metric and traditional units (like lakh litres in irrigation).