Convert signal strength to dbm I've got this app which shows network signal strength as a positive integer value btw 5 and 35. Another app uses negative integers like -99dbm.

Is there a way to convert the positive values (unit unknown) to dbm?
dBm = (2 × ASU) - 113
ASU in the range of 0-31 and 99 (for not known or not
detectable).