Volume Converter
Convert volume between liters, gallons, cups, milliliters, and other units.
Frequently Asked Questions
How many liters are in a gallon?
One US gallon equals approximately 3.78541 liters. The UK imperial gallon is slightly larger at 4.54609 liters. This distinction matters when filling up fuel tanks, comparing beverage prices internationally, or following recipes from different countries. The US gallon is the most commonly referenced in everyday conversions, but always verify which gallon type is being used in scientific or international commercial contexts to avoid errors.
How many cups are in a liter?
One liter equals approximately 4.22675 US cups. In cooking, recipes from the United States typically use cups, while those from other countries often use milliliters or liters. Knowing that roughly 4 cups make a liter helps you scale recipes up or down. A standard US cup is 240 milliliters, making it easy to measure both ways with the same measuring tools when converting between metric and imperial cooking measurements.
What is the difference between fluid ounces and regular ounces?
Fluid ounces measure volume (liquid), while regular ounces measure weight (mass). One US fluid ounce equals approximately 29.57 milliliters, and there are 128 fluid ounces in a US gallon. A standard can of soda is 12 fluid ounces. Do not confuse these units — a fluid ounce of water happens to weigh roughly one ounce by mass, but this relationship does not hold for liquids of different densities like oil or honey.