What is volume converter?
A volume converter changes the amount of liquid or space between units. It helps with cooking, fuel, aquariums, water tanks and shipping.
Be careful with gallons and fluid ounces, because US and UK values differ. The tool labels each one.
How to use the volume converter
- Enter the value.
- Choose the unit you have and the unit you want.
- Read the result and the table of all units.
How the volume converter works
Each volume is converted to liters using exact factors: one US gallon is 3.785411784 L, one US cup is 0.2365882365 L, one US fluid ounce is 0.0295735295625 L and one UK gallon is 4.54609 L. The result is divided by the target unit.
Worked example
Common uses of the volume converter
- Cooking and baking.
- Fuel economy comparisons.
- Water tanks and pools.
- Aquarium sizes.
- Shipping and packaging.
Tips and common mistakes
When you follow a recipe, check whether the cup is the US cup, the metric cup of 250 ml or another size.
Use the table to compare many units at once.
Background: what to know before you rely on it
Volume units are a common source of confusion. The US gallon is based on the old English wine gallon, while the UK imperial gallon was defined in 1824 as the volume of ten pounds of water. A US cup is about 237 ml, but many recipe books use 250 ml, and a tablespoon varies from 15 to 20 ml. In science the cubic meter and the liter are used, with one liter equal to one cubic decimeter. When accuracy matters, weigh ingredients instead of measuring them by volume.
Private, free and fast
This tool runs entirely in your browser. What you type or choose is not uploaded to a server and is not saved after you close the page, which keeps it fast and private. It is free to use as often as you like. See more in all converters, or browse the full list of tools.
Frequently asked questions
How many liters are in a US gallon?
3.785.
What is the difference between US and UK gallons?
A UK gallon is about 20 percent larger, at 4.546 liters.
How many milliliters are in a cup?
About 236.6 for a US cup.
How many liters are in a cubic meter?
1,000.
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Results are for information and education. For legal, financial, medical or security decisions, check with a qualified professional. Check critical conversions with an official source.