The Broadband Guide
SG
search advanced
 Username:
 Password:
Register
 forgot password?
 search
FAQs Categories:

How does RSSI (dBm) relate to signal quality (percent) ?

Tags: , , ,
Depending on your OS and application, WiFi signal strength is represented either as quality in percentage, or an RSSI value in dBm, i.e. -70db. RSSI is usually expressed in decibels relative to a milliwat (dBm) from zero to -120dBm and the closer it is to zero, the stronger the signal is. RSSI level less than -80dBm may not be usable, depending on noise.

While there is no simple precise solution that is used universally, we will try to explain the approximate correlation between signal (RSSI) and quality (percentage).

Generally,
dBm >= -50 dBm = 100% quality
dBm <= -100 dBm = 0% quality

For RSSI signal between -50dBm and -100dBm,
quality ~= 2* (dBm + 100)
RSSI ~= (percentage / 2) - 100

For example:
High quality: 90% ~= -55dBm
Medium quality: 50% ~= -75dBm
Low quality: 30% ~= -85dBm
Unusable quality: 8% ~= -96dBm

See also: How to read RSSI/signal and SNR/noise ratings ?

Note: Most networks can work well with signal over -80dBm.


  Post your review/comments
    rate:
   avg:
News Glossary of Terms FAQs Polls Cool Links SpeedGuide Teams SG Premium Services SG Gear Store
Registry Tweaks Broadband Tools Downloads/Patches Broadband Hardware SG Ports Database Security Default Passwords User Stories
Broadband Routers Wireless Firewalls / VPNs Software Hardware User Reviews
Broadband Security Editorials General User Articles Quick Reference
Broadband Forums General Discussions
Advertising Awards Link to us Server Statistics Helping SG About