There are converters for liters to milliliters, cubic meters to cubic centimeters and many other volume units.
An American recipe that asks for 8 fluid ounces of milk wants about 237 milliliters.
The liter (L) is the everyday metric unit of volume and is 1,000 cubic centimeters (cm³). A milliliter (mL) is a thousandth of a liter, which is exactly 1 cm³, and a cubic meter (m³) is 1,000 liters. Deciliters (dL), centiliters (cL) and kiloliters (kL) are a tenth, a hundredth and a thousand liters.
The imperial units of volume are the fluid ounce, pint, quart and gallon, and the UK and US each have their own versions. A UK pint is 20 fluid ounces (568 mL) whereas a US pint is 16 fluid ounces (473 mL), which makes the US gallon of 3.785 liters about 17% smaller than the UK gallon of 4.546 liters.
Liter
A liter is 1,000 cubic centimeters, which is the same as 1 cubic decimeter. It is written L or l, and the capital is preferred because a lowercase l looks like a 1.
Picture a cube 10 centimeters on each side – that is a liter, and a milliliter is a thousandth of it, ie one cubic centimeter. The liter is not actually an SI unit, although SI accepts it for use alongside the cubic meter.
To convert liters to gallons one must take care as there are several variations of gallons.
Gallon
A gallon is not one fixed volume. There is the US liquid gallon, the US dry gallon and the UK gallon.
In the US there are two types of gallon; liquid and dry. A US liquid gallon is equal to 128 fluid ounces or 3.785 liters. This is commonly used to measure gasoline and food commodities.
The US dry gallon is 4.405 liters, an eighth of a US bushel. It is used for dry goods such as grain and fruit.
The UK gallon is exactly 4.54609 liters, about 20% bigger than the US gallon. It divides into 4 quarts, 8 pints and 160 fluid ounces.