Volume Converter
Convert liquid and dry volumes instantly between all major metric, imperial (UK), and U.S. customary units.
The Complexity of Volume Conversion
Volume conversion is arguably the most complex common conversion because it involves two distinct primary systems: **Metric** (based on the liter/cubic meter) and **Imperial/U.S. Customary**. Crucially, the volume of a gallon, fluid ounce, and cup differs between the US and the older UK/Imperial standards, requiring separate conversion factors.
The Base Unit: The Liter
For calculation accuracy, all units are converted internally to the **Liter (L)**. The relationship between volume and length is defined by the metric system: $$ 1 \text{ Liter} = 1000 \text{ cubic centimeters} = 0.001 \text{ cubic meters} $$
Key Imperial/US Discrepancies:
Be aware that the US liquid measures are different from the Imperial (UK) measures:
- $1 \text{ US Liquid Gallon} \approx 3.785 \text{ Liters}$
- $1 \text{ UK/Imperial Gallon} \approx 4.546 \text{ Liters}$
- The US fluid ounce is also slightly larger than the Imperial fluid ounce.