Count activity, not devices
A home with 30 connected devices can run happily on a modest plan if most of them are idle. Smart plugs, thermostats and speakers use almost nothing. Phones sitting on a table use very little until someone picks one up. A home with five devices all streaming 4K at once needs far more.
So the useful question is: at your busiest time of day, what is everyone doing?
A simple worksheet
Add up the activities that overlap, using these per-device figures:
| Activity | Download per device | Upload per device |
|---|---|---|
| 4K streaming | 15–25 Mbps | — |
| HD streaming | 5 Mbps | — |
| Video call (1080p) | 3 Mbps | 4 Mbps |
| Online gaming | 1–3 Mbps | Under 1 Mbps |
| Browsing and social media | 1–5 Mbps | Under 1 Mbps |
| Security camera uploading to the cloud | — | 1–4 Mbps each, often continuously |
Video figures are from Netflix and Zoom; the others are typical ranges. Then add 25–50% headroom for updates and spikes.
Worked example
A family evening: two 4K TVs (2 × 20), one video call (3 down, 4 up), a teenager gaming (2) and three people scrolling on phones (3 × 3). That is about 54 Mbps download and 5 Mbps upload. With headroom, a plan delivering 75–100 Mbps down and 10 Mbps or more up covers it. If the console starts a 60 GB update in the middle of it, more speed shortens how long everyone else is affected.
Background traffic you don’t see
- Console and PC game updates, often very large.
- Phone and computer system updates.
- Cloud photo and file sync, which uses upload.
- Security cameras, which upload around the clock if set to record to the cloud.
Most of these can be scheduled for overnight. Doing that often helps more than a faster plan.
When WiFi, not your plan, is the limit
WiFi devices share airtime. A few slow or distant devices can take up a disproportionate share, slowing everyone else. If wired tests are fast but WiFi feels slow when many people are home:
- Move fixed devices like TVs, consoles and desktops to Ethernet where you can.
- Use a router or mesh system with 5 GHz (and 6 GHz if your devices support it).
- Place the router centrally, or add mesh points so devices are not shouting from the far end of the house.
Use the WiFi speed test in each room to see where coverage drops.