1 US Cup = 14.4375 Cubic Inches
1 Canadian Cup = 13.87 Cubic Inches
1 Metric Cup = 15.256 Cubic Inches
Cup is a volume unit and used mostly in cooking to measure liquid and bulk, dry foods. There is no international standard for cup sizes but mostly US Customary and metric cups are used and they are different in sizes.
Cubic inch is an imperial, US Customary unit. It is defined as a cube with all sides are one inch in length. The abbreviation is "in3".