### Jump To Section

- What Is a Milliliter?
- What Is the Difference Between the Metric System and the Imperial System?
- Why One Cup Doesn’t Always Equal One Cup
- How Many Milliliters in a Cup?
- How Many Milliliters in a Half Cup?
- How Many Milliliters in a Third Cup?
- How Many Milliliters in a Quarter Cup?
- How Many Milliliters in an 8 oz Cup?
- How Many Milliliters in a Cup of Coffee?
- How Many Milliliters in a Bottle of Water?
- How Many Milliliters in a Carton of Milk?
- How to Measure by Volume
- How Many Milliliters in a Cubic Centimeter?
- How Many Milliliters in a Cubic Inch?
- How Many Milliliters in a Cubic Foot?
- How Many Milliliters in a Cubic Meter?

## What Is the Difference Between the Metric System and the Imperial System?

The metric system is the most common system of measurement around the world. The only nations that do not use the metric system are the United States, Myanmar, and Liberia.

The U.S. system of weights and measures is based on the imperial system, also known as the British Imperial System (Great Britain abolished the imperial system in 1965). The metric system primarily measures ingredients by weight, while the imperial system measures ingredients by volume, making conversions between them especially tricky when it comes to cooking and baking.

## Why One Cup Doesn’t Always Equal One Cup

To make matters trickier, cups aren’t all standard in size. There are different ways to measure cups:

**Legal U.S. cup**: the measurement used in cooking units, serving sizes, and nutrition labeling in the U.S. One legal cup equals 8 U.S. fluid ounces.**Customary U.S. cup**: how much a standard U.S. drinking cup holds.**Imperial cup**: the Imperial system measures fluid ounces differently than the U.S. system. One imperial cup equals 9.61 U.S. fluid ounces (or 10 imperial fluid ounces), making it slightly larger than one legal U.S. cup. The difference is negligible for a single cup but noticeable in large quantities.**Metric cup**: a measurement derived from the metric system, but not part of the modern form of the metric system, the International System of Units. One metric cup equals 8.45 U.S. fluid ounces, making it slightly larger than one legal U.S. cup but slightly smaller than one imperial cup.

Need a conversion chart yet? We have you covered.