There are some general rule of thumbs that can be used.

Doubling the data rate give 3dB less sensitivity.
4x data rate give 6 dB less sensitivity.

6 dB less sensitivity is used as approximate 50 % range.

2.4 kb/s = x meters
9.6 kb/s = x/2 meters
38,4 kb/s = x/4 meters
Etc.

Last Update: August 8, 2017