There are 1,000 liters in one kiloliter. Both liters and kiloliters are a measurement of volume, usually used to measure liquids. Liters are a basic unit in the metric system.
It's generally easy to convert up and down for any measurement in the metric system because each area of measurement is based on a single unit, and larger and smaller amounts are reached through multiples of 10, 100, and 1,000. Kilo means thousand, so it always represents 1,000 of a unit. A kilometer is 1,000 meters; a kilogram is 1,000 grams. Centi means one-hundredth, so there are one hundred centimeters in a meter. Hecto means hundred, deca means ten and milli means one-thousandth.