Convert between liters, gallons, cups, fluid ounces, and cubic units instantly.
This tool converts between nine common volume units by first converting to cubic meters (the SI unit for volume), then converting to the target unit. It supports both US customary and imperial units, which can be confusing since they share names like "gallon" but have different sizes. All conversion factors follow internationally recognized definitions.
| From | To | Factor |
|---|---|---|
| 1 Liter | US Gallons | 0.264172 |
| 1 US Gallon | Liters | 3.78541 |
| 1 US Cup | Milliliters | 236.588 |
| 1 US Fluid Oz | Milliliters | 29.5735 |
| 1 Imperial Gallon | Liters | 4.54609 |
| 1 Cubic Foot | Liters | 28.3168 |
| 1 Cubic Meter | Liters | 1,000 |
A common source of confusion is that US and Imperial gallons are different sizes. A US gallon is 3.785 liters while an Imperial gallon is 4.546 liters — about 20% larger. Similarly, a US fluid ounce (29.57 mL) differs slightly from an Imperial fluid ounce (28.41 mL). This tool keeps them separate so you always get the right answer for your region.