Volume Converter
Enter a volume and its unit to see the equivalent in milliliters, liters, cubic meters, cubic centimeters, US gallons, quarts, cups, and cubic feet.
How volume conversion works
Metric volume units scale by powers of 10 (1 L = 1000 mL = 1000 cm³, and 1 m³ = 1000 L), so converting between them is just moving the decimal point.
US customary volume units are defined by fixed factors relative to the liter: 1 US gallon is exactly 3.785411784 liters, 1 US quart is a quarter of a gallon, and 1 US cup is 1/16 of a gallon. This calculator uses those exact factors.
Frequently asked questions
How many liters are in a US gallon?
1 US gallon equals exactly 3.785411784 liters, often rounded to about 3.785 liters.
Is a US gallon the same as a UK (imperial) gallon?
No — a US gallon (3.785 L) is smaller than a UK imperial gallon (4.546 L). This calculator uses US customary units throughout.
How many cups are in a liter?
1 liter is approximately 4.2268 US cups, since each US cup is defined as exactly 1/16 of a US gallon.