How to convert Wifi signal strength from Quality (percent) to RSSI (dBm)?

Question

How should I convert Wifi signal strength from a Quality in percentage, usually 0% to 100% into an RSSI value, usually a negative dBm number (i.e. -96db)?

Answer 1

From experience:

1. Less than -50dB (-40, -30 and -20) = 100% of signal strength
2. From -51 to -55dB= 90%
3. From -56 to -62dB=80%
4. From -63 to -65dB=75%

   The below is not good enough for Apple devices

5. From -66 to 68dB=70%
6. From -69 to 74dB= 60%
7. From -75 to 79dB= 50%
8. From -80 to -83dB=30%
   Windows laptops can work fine on -80dB however with slower speeds