The KV rating is just part of the puzzle.
1. Picking a battery voltage
The size/power of the motor and the desired propeller has a great deal to do with the RPM.
Most propellers that I use are most efficient when they have a 6.5 pitch, and twelve to thirteen inch lengths.
Desired RPM - - I start out with about 10,000 RPM as a first wag. I prefer a final range between 9 and about 13 thousand RPM
Lower diameter propellers can be used at higher RPM than larger ones.
Motors power My models range from about 500W to more than 1,600W
Batteries used usually 4S and 6S for the 1600W motor.
E Calc (propeller) can be accessed via the castle creations web site or directly. The Castle link will usually give access to a better motor selection.