How should I size the number of ports for future devices?

Start by listing current devices and those you expect to add in the next 12–24 months, noting which need wired connections. Include any planned cameras, controllers, displays and laptops. Think about whether devices should be on separate VLANs or grouped by function, and whether you’ll add PoE-powered devices. Factor in a small reserve of ports for growth and for a future switch, rather than forcing everything into a tight, single-box port count. If you’re near the limit, a compact managed switch can give you cleaner growth without replacing the router. In most cases, choosing a router with a few spare ports and pairing it with a purpose-built switch for larger growth gives the cleanest path to expansion while keeping management simple.