Volume Converter
Convert millilitres, litres, cubic metres, spoons, cups, and both gallons. A US gallon is 3.78541 L. An imperial gallon is 4.54609 L, about 20 percent larger.
Common volume conversions
| Conversion | Result |
|---|---|
| 1 US gallon | 3.78541 L |
| 1 imperial gallon | 4.54609 L |
| 1 imperial gallon | 1.20095 US gallons |
| 1 US cup | 236.588 ml |
| 1 tablespoon (US) | 14.787 ml |
| 1 teaspoon (US) | 4.929 ml |
| 1 US gallon | 16 US cups |
Worked example
A standard 18.9 L water cooler jug: 18.9 divided by 3.78541 L per US gallon = 4.993 US gallons, effectively the familiar 5 gallon jug. Enter 18.9, choose Litres, then choose US gallons to see 4.993.
Frequently asked questions
Why are there two different gallons?
The imperial gallon (4.54609 L) was the British and old Canadian standard. The US gallon (3.78541 L) is smaller. Older Canadian fuel economy ratings used imperial gallons, which is why MPG figures in Canada used to look higher than US figures for the same car.
How many cups are in a US gallon?
Exactly 16, since a US gallon is 128 fluid ounces and a cup is 8 fluid ounces. In metric, one US gallon is 3,785.41 ml.
Results are provided for general reference. Spoon and cup measures here are US customary units; Canadian metric spoons are 5 ml and 15 ml.