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1 cup SI = 1.06 cup
1 cup = 0.95 cup SI
Definition of Metric cups of water provided by WikiPedia
The cup is a unit of measurement for volume, used in cooking to measure liquids (fluid measurement) and bulk foods such as granulated sugar (dry measurement). It is principally used in the United States and Liberia where it is a legally defined unit of measurement. Actual cups used in a household in any country may differ from the cup size used for recipes; standard measuring cups, often calibrated in fluid measure and weights of usual dry ingredients as well as in cups, are available.
Definition of US cup of water provided by WikiPedia
Pne U.S. cup of water weighs approximately 81⁄3 avoirdupois ounces. Since an imperial cup of water weighs approximately 10 avoirdupois ounces and five imperial cups are approximately equal to six U.S. cups