# What is a kiloliter?

scientist with beakers

The kiloliter (kL), which is more commonly written as kiloliter outside the United States, is a metric unit of measurement that refers to volume. It is 1000 times the size of a liter, which is a more recognizable unit of measurement for small amounts of liquid. The hierarchy of ascending liter measurements is as follows: milliliter, centiliter, deciliter, liter, dekaliter, hectoliter, and kiloliter. Other major and minor measures are used much less frequently.

The use of liters derives from metric systems developed in France, and the English name for liter is a close derivative of the French term liters litre. The liter became popular for use in France after the French Revolution and the measurement quickly spread to other countries. The precise definition of the liter and its multiples has changed over time. Currently, a liter equals 0.001 cubic meters, but for a while it was not exactly equal to that number. It was not until 1964 that the General Conference on Weights and Measures (GCWM) decided to establish and standardize an exact relationship between kiloliters and cubic meters that would make them equivalent.

Given this change, defining the kiloliter as a precise fit with cubic meter measurements was not always easy. Also, this measurement is not often used unless large amounts of volume are being evaluated. With standardization, however, the kiloliter is exactly equal to a single cubic meter, which makes mathematical calculations and conversions simpler.

For those people who don’t use metric measurements often, it also helps to get a sense of kiloliters translated to standard volume measurements, which are often used in places like the US. The kiloliter is equal to 33,814.02 fluid ounces, 4,226.75 cups, 2,113.38 liters, 1,056.69 quarts, 264.17 gallons, and 35.32 cubic feet. It’s helpful to think about the size of a kiloliter in half-gallon milk cartons. Essentially, more than 500 full milk cartons are needed to equal a single kiloliter.

The size of this measurement suggests that it is not practical for most everyday measurement tasks. Instead, it can be used to accurately discuss the volume of large amounts of liquid. Figuring out the amount of water in a lake or stream can use kiloliters as a measure, or sometimes it can even use cubic meters. The number of gallons of water in a swimming pool can also be converted to kiloliters. The release of large amounts of liquid pollutants or chemicals can also be measured in kiloliters.

Basically, kiloliters are metric measures of volume and one is equal to 1000 liters or a single cubic meter. They tend to be used to measure high volume levels, which means most people won’t use this unit often for daily activities. Kiloliters are easily converted to other metric measurements and, with a little work, can also be converted to standard measurement systems.