Water Volume Conversion Chart
Compare common water volumes across millilitres, litres, US fluid ounces, US cups, US gallons, and 500 mL bottle equivalents. Values are rounded for quick reference.
Convert a custom amount
Common water quantities
Approximate values, rounded to 3 decimal places. “US cup” means 236.5882365 mL; bottle equivalents use a 500 mL bottle.
| Volume | Litres | US fl oz | US cups | US gallons | 500 mL bottles |
|---|---|---|---|---|---|
| 250 mL | 0.25 | 8.454 | 1.057 | 0.066 | 0.5 |
| 355 mL | 0.355 | 12.004 | 1.5 | 0.094 | 0.71 |
| 500 mL | 0.5 | 16.907 | 2.113 | 0.132 | 1 |
| 750 mL | 0.75 | 25.361 | 3.17 | 0.198 | 1.5 |
| 1,000 mL | 1 | 33.814 | 4.227 | 0.264 | 2 |
| 1,500 mL | 1.5 | 50.721 | 6.34 | 0.396 | 3 |
| 2,000 mL | 2 | 67.628 | 8.454 | 0.528 | 4 |
| 3,785.412 mL | 3.785 | 128 | 16 | 1 | 7.571 |
| 4,546.09 mL | 4.546 | 153.722 | 19.215 | 1.201 | 9.092 |
A US gallon and an Imperial gallon are different sizes. The final two reference rows represent 1 US gallon and 1 Imperial gallon; values are shown in the mL column.
Unit definitions
1 US liquid gallon is 3.785411784 L; 1 Imperial gallon is 4.54609 L. A US fluid ounce measures volume and is not an ounce by weight. A US customary cup is 8 US fluid ounces, about 236.588 mL.
How to use this volume chart
Choose the source unit first
In the custom converter, select the unit printed on your container, recipe, or reference. The tool converts the entered amount to millilitres internally, then displays the equivalent in each listed unit.
Read rounded values as estimates
The common-quantity table is a quick reference, not a precision lab table. Its US and Imperial gallon rows are separate because those gallons have different volumes. Use the dedicated converter when you need a specific directional conversion.
Understand bottle equivalents
The bottle column compares each amount with a 500 mL reference bottle. It is a volume comparison only; actual bottles vary in size and this is not a recommendation for how much water to drink.
When accuracy matters
Follow the unit and precision specified by the source. Kitchen “cups” may refer to different sizes, and ounces by weight are different from fluid ounces by volume.
Rounding and sources
The table rounds values for readability. Exact results depend on the conversion factors used before display rounding.
NIST Guide to the SI: volume conversion factors · NIST Metric Kitchen equivalents