The KV value is the speed the motor needs to turn in order to offer 1V of counter-electromotice force. A real world motor is not always 100% efficient though. Given the wide range of possible battery configurations, you want to choose a motor with a KV rating that can optimize the performance of your RC model. This app lets you quickly choose a rating that can achieve your desired performance in rpm.
Here is the ink to the web version of the app (Windows and iphone): https://fingertainment.itch.io/rcpress-kvrpm-calculator
Android: https://play.google.com/store/apps/details?id=com.rcpress.kvrpm
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