Cups are not used as conventional measurement units because there is no standard size of a cup worldwide. This means that apart from kitchen measurements of liquids and dry material, cups are hardly used anywhere else.
Although cups may vary in sizes, the standard conversion factors in the US are as follows;
1 fluid Cup = 0.25 L
1 solid cup = 0.236588236 L
Conversion Calculator for Cups to Liters
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Cups to Liters Conversion Chart[table “17” not found /]
Other volume conversions