buttons below to add one or more materials in the path of your WiFi signal. Read the gauge results for each of the four distances shown (20, 40, 100, and 200 feet). Check your WiFi devices' specifications to see which frequency band(s) are applicable (2.4, 5, and/or 6GHz). A reliable signal will be in the "green" zone of the gauge (5) . Signal Power (dBm)
Router Transmit Power :
Add obstructions
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2GHz obstruction loss total = (dB)
5GHz obstruction loss total = (dB)
6GHz obstruction loss total = (dB)
Notes: Accurately predicting WiFi signal propagation is a difficult and complex problem beyond the scope of this calculator. The WiFi signal calculator here provides a simplified propagation model and should be used for illustration purposes only. The signal level calculation used is based on the well-known free space path loss formula: fspl=20log10(d)+20log10(f)+20log10(4PI/c)-Gt-Gr where d=distance, f=frequency, c=speed of light, and Gt and Gr are the gain of the transmit and receive antennas. For this calculator, the transmit and receive antennas are assumed to be isotropic with a gain of 0dBi.
(1) Material attenuation values source: "NIST Construction Automation Program Report No. 3 Electromagnetic Signal Attenuation in Construction Materials", NIST United States Department of Commerce Technology Administration National Institute of Standards and Technology, NISTIR 6055, William C. Stone, October 1997, Building and Fire Research Laboratory.
(2) Material attenuation values source: "Propagation Losses Through Common Building Materials 2.4 GHz vs 5 GHz, Reflection and Transmission Losses Through Common Building Materials", Magis Networks, Inc., Prepared by: Robert Wilson Graduate Student University of Southern California For: James A. Crawford, CTO Magis Networks, Inc. August 2002.
(3) Material attenuation values source: "Compilation of measurement data relating to building entry loss", ITU-R Radiocommunication Sector of ITU, Report ITU-R P.2346-1 (06/2016).
(4) For completeness, 5GHz and 6GHz material attenuation values set equal to each other.
(5) For this calculator, a reliable WiFi signal level is considered to be -60dBm or greater (green). A possibly usable but less reliable signal level is in the range of -80dBm to -60dBm (yellow). Signal levels below -80dBm are considered unreliable (red).