A kilogram of flour is equal to 8 cups of flour, when converting metric measurements to U.S. Standard measurements. In the U.S., recipe ingredients tend to be measured by volume, while other countries measure dry ingredients by weight and liquid ingredients by volume.
Another complication is that the U.S. Standard measuring system also uses different definitions for some measurement terms, when referring to dry and liquid ingredients. A person doesn't need to be a math genius, however, to prepare international cuisine from scratch. There are numerous ingredient conversion calculators available to help determine the exact amounts of dry and liquid ingredients required.