| Unit | Equals (liters) |
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1 US gallon equals 3.78541 liters, and 1 UK (imperial) gallon equals 4.54609 liters. This tool supports both US and UK gallons — make sure to select the correct type. US gallons are used in the United States, while UK gallons are used in the UK and parts of Canada.
1 US fluid ounce (fl oz) equals 29.5735 milliliters (ml). 1 UK fluid ounce equals 28.4131 milliliters. Note that ounces can be both a weight and volume unit — this tool uses fluid ounces (fl oz) specifically for liquid volume measurement.
1 cubic meter (m³) equals 1000 liters (L). The full conversion: 1 m³ = 1000 cubic decimeters = 1,000,000 cubic centimeters = 1000 liters. Cubic meters are the standard SI unit for volume used in construction, engineering, and water management.
1 standard oil barrel (bbl) equals 158.987 liters (42 US gallons). This is the standard unit for international crude oil trading. In everyday terms, 1 barrel ≈ 159 liters. Note that oil barrels differ from regular liquid barrels in capacity.
1 US cup equals 236.588 milliliters (ml). The UK cup equals 284.131 milliliters. In cooking and baking, 1 cup is often rounded to 240 ml. Other common conversions: 1 cup = 8 fluid ounces, 1/2 cup = 4 oz, 1/4 cup = 2 oz. This tool provides exact conversions.