Volume Converter
The volume converter allows you to quickly and accurately convert between the most common units of volume and capacity. Whether you're working with liters, milliliters, gallons, fluid ounces, or cups, this tool handles the math instantly.
Volume conversions are essential in cooking, chemistry, medicine, and everyday life. With different countries using metric and imperial systems — and even US and UK gallons differing — the ability to convert between them is a crucial practical skill.
How it works
Volume conversions use standardized factors. All units are converted through a base unit (liters). For example: 1 US gallon = 3.785411784 L, 1 fluid ounce = 0.0295735296 L, 1 cup = 0.2365882365 L. To convert between any two units, the value is first converted to liters, then to the target unit.
Use cases
- Converting recipe measurements between metric and imperial systems
- Calculating liquid volumes for chemistry and laboratory work
- Converting fuel tank capacities between liters and gallons
- Adjusting medicine dosages between milliliters and fluid ounces
Frequently asked questions
How many liters are in a gallon?
One US gallon equals 3.785411784 liters, while one UK (imperial) gallon equals 4.54609 liters. The difference matters when converting fuel or recipe volumes, so always confirm which gallon you mean. This converter uses the US gallon by default.
How many milliliters are in a cup?
A US customary cup is 236.588 milliliters (0.2365882365 L), while a metric cup used in many recipes is exactly 250 mL. Because these differ, cup measurements can vary by roughly 5% depending on the standard. For precise cooking, weighing ingredients is more reliable than volume.
How do you convert fluid ounces to milliliters?
Multiply US fluid ounces by 29.5735 to get milliliters, so 8 fl oz is about 236.6 mL. A UK fluid ounce is slightly different at 28.4131 mL. Enter the value and the tool applies the correct factor automatically.
What is the difference between a US gallon and a UK gallon?
A UK imperial gallon (4.546 L) is about 20% larger than a US gallon (3.785 L). This is because the two countries defined the gallon using different reference volumes. When comparing fuel economy or container sizes across regions, using the wrong gallon introduces a significant error.
How do I convert liters to cubic meters?
Divide the number of liters by 1,000, since 1 cubic meter equals 1,000 liters. For example, 2,500 liters is 2.5 m³. To go the other way, multiply cubic meters by 1,000 to get liters.