Converting measurements such as 1/3 liter to cups is a task common in cooking. If you don't have a conversion calculator or access to the Internet, you need to complete a simple math formula, so that your brownies aren't soggy. A slight error in cooking can ruin all the time you spent on making the perfect dish. A good set of measuring cups with multiple measurements will solve your conversion problems, but who ever said that cooking is easy.
Familiarize yourself with what the conversions for whole number measurements are. For example, the approximate cup equivalent of 1 liter is 4.2. A rough estimate rounded to the first decimal place is standard cooking procedure. The actual conversion rate is 4.22675284.
Divide 4.2 cups by the same amount (common denominator) as you would divide 1 liter to arrive at 1/3 liter. For example, you would divide 1 liter by three to arrive at 1/3 of a liter. So divide 4.2 cups by the same common denominator of three to arrive at 1.4, or approximately 1 and a 1/2 cups.
Note that you can also enter the phrase "1/3 liter to cups" in Google. This acts as a conversion calculator and will give you the exact amount.