Volume Converter
Convert between liters, gallons, cups, milliliters, fluid ounces, and cubic meters instantly.
About Volume Converter
Our free Volume Converter allows you to instantly convert between liters, US gallons, US cups, milliliters, US fluid ounces, and cubic meters. This is useful for cooking, chemistry, engineering, and any situation where you need to switch between metric and imperial volume measurements.
Volume conversion is particularly important in cooking and baking, where recipes may use different measurement systems. A recipe from Europe might list ingredients in milliliters and liters, while a US recipe uses cups and fluid ounces. This tool bridges that gap instantly and accurately.
All conversions use precise international standards: 1 US gallon = 3.78541 liters, 1 US cup = 0.236588 liters, 1 US fluid ounce = 0.0295735 liters, and 1 cubic meter = 1000 liters. Note that these are US measurements — imperial (UK) measurements differ slightly.
Frequently Asked Questions
Q What is the difference between US and UK gallons?
A US gallon equals 3.78541 liters, while a UK (imperial) gallon equals 4.54609 liters — about 20% more. This converter uses US gallons, which are standard in the United States. If you need UK gallons, multiply the US gallon result by 1.20095.
Q How many cups are in a gallon?
There are 16 US cups in 1 US gallon. Since 1 cup equals 8 fluid ounces and 1 gallon equals 128 fluid ounces, you get 128 ÷ 8 = 16 cups. This is a common conversion needed when scaling recipes up or down.
Q How many milliliters are in a fluid ounce?
One US fluid ounce equals approximately 29.5735 milliliters. For practical cooking purposes, this is often rounded to 30 ml. Note that this is for fluid ounces (volume), which is different from ounces (weight/mass).