How Many Devices Can Connect to One Wireless Router?

Computers and other devices on a network must share a finite capacity of resources, and that's true for wired and ​Wi-Fi networks alike. However, the precise limits depend on multiple factors.

For example, you may notice that when you connect your laptop, a couple desktops, and some phones to your network, it's much harder to stream Netflix on your TV. In fact, not only will video streaming quality diminish but also the download and upload quality of every device on the network.

Most home networks and public Wi-Fi hotspots function with a single wireless access point (a broadband router in the case of home networking). Conversely, larger business computer networks install multiple access points to expand the wireless network's coverage to a much larger physical area.  

Each access point has limits for the number of connections and amount of network load it can handle, but by integrating multiple of them into a larger network, the overall scale can be increased.

Many individual wireless routers and other access points support up to approximately 250 connected devices. Routers can accommodate a small number (usually between one and four) of wired Ethernet clients with the rest connected over wireless.

The speed rating of access points represents the maximum theoretical network bandwidth they can support. A Wi-Fi router rated at 300 Mbps with 100 devices connected, for example, can only offer on average 3 Mbps to each of them (300/100=3).

Naturally, most clients only use their network connection occasionally, and a router shifts its available bandwidth to the clients that need it.

Connecting 250 devices to a single Wi-Fi access point, while theoretically possible, is not feasible in practice for a few reasons:

• On home networks, all devices normally share a single internet connection. The performance of clients' access will start to degrade as more devices join the network and start using it simultaneously. Even just a handful of active devices streaming video or downloading files can quickly max out a shared internet link.
• Access points overheat and stop working when operating at extreme loads for extended periods, even if handling only local traffic and not accessing the internet.
• Having a large number of WiFi clients concentrated in close physical proximity, like a home or office building, generates significant wireless signal interference. Radio interference among Wi-Fi clients degrades network performance (due to frequent re-broadcasting of messages that fail to reach their destination) and eventually causes connection drops.
• Some home routers include a feature that allows administrators to control the number of clients that can simultaneously connect. Many Linksys routers, for example, set a default maximum of 50 maximum clients. Administrators often keep a limit like this in place to keep the router and network running reliably.

Installing a second router or access point on a home network can greatly help distribute the network load. By adding more access points to the network, effectively any number of devices can be supported. However, this will make the network progressively more difficult to manage.

Something else you can do if you already have one or more routers that support a large number of devices is to increase the bandwidth available to each simultaneously connected device by upping your subscription with your ISP.

For example, if your network devices and internet subscription lets you download at 1 Gbps, then having even 50 devices connected at once lets each device consume up to 20 megabits of data per second.