WiFi Channel & Width Planner (2.4 / 5 / 6 GHz)
Select your wireless frequency band, neighbor interference density, and number of access points to get non-overlapping channel and MHz width recommendations.
Why Manual Channel Planning Beats 'Auto' Channel Selection
Most consumer routers only scan for neighboring WiFi congestion at the exact moment they boot up. If your router and your neighbor's router both reboot after a power flicker, or if a router selects channel 3 or 8 on the 2.4 GHz band, it causes severe adjacent-channel interference (ACI) where frames collide without triggering polite 802.11 CSMA/CA Clear Channel Assessment wait times.
US FCC Non-Overlapping Channel Cheat Sheet
| Band | Recommended Channel Width | Non-Overlapping Channels (USA) | Deployment Rule |
|---|---|---|---|
| 2.4 GHz | 20 MHz only (Never 40 MHz) | 1, 6, 11 | Assign multi-AP nodes to 1, 6, and 11 at Low/Medium transmit power (11–15 dBm). |
| 5 GHz (UNII-1) | 40 MHz or 80 MHz | 36, 40, 44, 48 (or single 80 MHz block 36–48) | Zero DFS radar wait time; supported by 100% of 5 GHz clients. |
| 5 GHz (DFS UNII-2) | 40 MHz or 80 MHz | 52–64, 100–144 (Avoid 120–128 TDWR weather radar) | Cleanest spectrum in apartments, but router must vacate channel if radar is detected. |
| 5 GHz (UNII-3) | 40 MHz or 80 MHz | 149, 153, 157, 161 (+ 165 at 20 MHz) | Higher FCC transmit power limit; best non-DFS alternative to UNII-1. |
| 6 GHz (WiFi 6E/7) | 160 MHz (or 320 MHz on WiFi 7) | PSC Channels: 5, 21, 37, 53, 69, 85, 101, 117... | Always use Preferred Scanning Channels (PSC) for fast WPA3 client discovery. |
Multi-Access Point Channel Reuse Strategy
When operating two or three wired access points (or mesh nodes with wired Ethernet backhaul), never put two adjacent access points on the same channel. Place AP #1 on 2.4 GHz Ch 1 / 5 GHz Ch 36 (80 MHz), AP #2 on 2.4 GHz Ch 6 / 5 GHz Ch 149 (80 MHz), and AP #3 on 2.4 GHz Ch 11 / 5 GHz Ch 52 or 100 DFS (80 MHz). Lowering 2.4 GHz transmit power by 6 dB relative to 5 GHz naturally encourages dual-band phones and laptops to prefer the faster 5 GHz and 6 GHz radios.