How to use this volume converter
Enter a volume, choose the source unit, and select the desired unit. Check the country or standard behind a recipe, container, or specification before choosing gallon, cup, or fluid ounce units.
How the calculation works
Volume measures three-dimensional space, while capacity describes how much a container can hold. Liters and cubic meters are linked exactly: one cubic meter equals 1,000 liters.
A US liquid gallon is exactly 3.785411784 liters, but an imperial gallon is exactly 4.54609 liters. Because the same word names different quantities, the calculator labels each gallon explicitly.
Formulas
General conversion
Metric relationship
Worked examples
Convert 1 US gallon to liters
One US liquid gallon equals exactly 3.785411784 liters.
Convert 500 milliliters to liters
500 × 0.001 = 0.5 liter.
Common uses
Cooking and recipes
Translate liquid quantities while checking whether the source uses a US, imperial, metric, or recipe-specific definition. Ingredient density is required to convert volume to mass.
Containers and household use
Compare tanks, bottles, appliances, fuel, and packaged liquids listed in liters, gallons, quarts, or cubic meters.
Science and engineering
Move between metric volume units and documented customary factors while preserving enough precision for later calculations.
Accuracy and limitations
The converter uses exact definitions for the included units and labels US and imperial gallons separately. The US legal cup is defined here as 240 milliliters.
Cup, tablespoon, gallon, and fluid-ounce conventions vary by region and context. Confirm the standard named by the recipe, regulator, manufacturer, or technical document.
Frequently asked questions
Are US and imperial gallons equal?
No. An imperial gallon is about 20% larger than a US liquid gallon.
Is a fluid ounce a unit of weight?
No. A fluid ounce measures volume; an ounce without fluid usually describes mass.
Which cup does this calculator use?
It labels the US legal cup, defined as 240 milliliters. Recipe cup definitions can vary.
How many liters are in a cubic meter?
Exactly 1,000 liters.
Is the volume converter free to use?
Yes. NumUtility is free, requires no account, and places no limit on ordinary calculations.
Are my entries stored?
No. The calculation runs in your browser. Values entered into the tool are not sent to NumUtility or saved by us.