Why Does WiFi Signal Weaken with Distance and Walls?
Everyone has experienced fast WiFi in the living room that suddenly slows down in the bedroom. Radio signals naturally weaken over distance, and each wall or piece of furniture they pass through causes additional loss. This calculator takes the distance from your router, the number of obstacles, and the frequency band, then estimates the resulting signal strength in dBm.
Free-Space Path Loss and Obstacle Attenuation
Radio waves spread out and lose energy as they travel, a phenomenon known as free-space path loss (FSPL). Each concrete wall the signal crosses adds further loss, and attenuation accumulates as the number of walls increases.
What's the Difference Between 2.4GHz and 5GHz?
The 5GHz band delivers faster speeds but its shorter wavelength is easily blocked by walls and obstacles. The 2.4GHz band is slower but travels farther and penetrates obstacles more effectively. Homes with many rooms or thick walls benefit more from 2.4GHz, while open spaces like a living room favor 5GHz.
Frequently Asked Questions
Increased distance and walls both attenuate the signal.
5GHz is faster but weaker through obstacles; 2.4GHz is slower but travels farther.
Move your router to a central spot or use mesh WiFi/range extenders.