Ounces and liters are used for measuring volume in different systems. This is why it is not so easy to convert values from ounces into liters and vice versa.
The liter is a very definite unit from the metric system and there is nothing unclear about it. It is equal to one cubic decimeter.
But you can get confused while dealing with ounces, because there several types of this unit. First, you should understand that now we mean fluid ounces, not dry ones, which are used for measuring weight. Second, there two main kinds of the fluid ounce: the imperial ounce and the US customary ounce. They are not equal in volume.
One imperial fluid ounce has 28.41 cubic centimeters.
On US customary fluid ounce has 29.57 cubic centimeters.
Now we can calculate how many ounces there are in one liter.
One liter is equal to 35.19 imperial fluid ounces.
One liter is equal to 33.81 US customary fluid ounces.
If you do not have a calculator next your hand, you can use the following table (for US fluid ounces) for making conversions.