Remembering the exact conversion for cubic centimeters to cups is a little difficult, but it is fairly easy to roughly convert between metric and U.S. units using a simple rule of thumb: 1 liter is only slightly larger than a U.S. quart. In fact, it measures about 1.06 U.S. quarts. With this conversion in mind, one can roughly convert a cup into cubic centimeters without a calculator. A cup is one fourth of both a quart and a liter, so it is roughly 250 milliliters, or cubic centimeters. This is only about 14 cubic centimeters away from the true result, making it a useful approximation for recipes and other everyday applications.

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