Volume Converter: Convert Liters, Milliliters, Cups and Gallons
Volume units appear in recipes, product labels, storage and schoolwork. Select the correct system and convert the value, while checking whether a recipe means US or another regional cup measure.
Convert a volume measurement
- Enter the numeric volume.
- Choose the starting unit, such as liters or US cups.
- Choose the target unit.
- Select Convert and read the equivalent.
- Use Swap units to change the direction of conversion.
Available volume units
This converter supports liters, milliliters, cubic meters, US gallons and US cups. A US cup is not identical to every regional cup measure.
Recipes and product specifications
For cooking, use the unit system specified by the recipe. For regulated labels, chemicals or dosing, verify the required standard and use appropriate measuring equipment.
Units and definitions
The converter supports litres, millilitres, cubic metres, US gallons and US cups. One litre is 1,000 millilitres, and one cubic metre is 1,000 litres. A US gallon is about 3.785 litres and a US cup is about 236.6 millilitres. Imperial gallons, which are used in the United Kingdom, are larger at about 4.546 litres, and a metric cup in some recipes is 250 millilitres, so check which system a recipe or a label uses.
Worked examples
Two litres are about 8.45 US cups. A 500 millilitre bottle is about 2.11 US cups. One US gallon is about 3.785 litres, so a 20 gallon tank holds about 75.7 litres. A water tank of 3 cubic metres holds 3,000 litres. Try these numbers in the tool, then use Swap units to see the reverse direction.
Recipes, tanks and labels
For cooking, use the measuring cups and spoons that the recipe was written for, because cup sizes differ from country to country. For tanks and pools, convert the volume and then add a safety margin. For medicine, chemicals or anything regulated, follow the label and a qualified person, because a rounded conversion is not precise enough for dosing.
Frequently asked questions
Are US gallons the same as imperial gallons?
No. The converter uses US gallons. Confirm the unit system before using a conversion.
Can I use this for medication doses?
Do not rely on a rounded general converter for medication dosing. Follow the product label and a qualified professional’s instructions.
How many US cups are in a litre?
One litre is about 4.23 US cups.
Is a US gallon the same as a UK gallon?
No. A US gallon is about 3.785 litres and a UK (imperial) gallon is about 4.546 litres. This tool uses the US gallon.
Can I use it for medicine doses?
No. Follow the label and a doctor or pharmacist. A general converter rounds the result.
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