ISPs sell speed the way gyms sell memberships: the bigger number feels safer, so most people buy more than they'll ever use. The honest truth is that the majority of households would notice no difference between a 100 Mbps line and a 1 Gbps line in day-to-day use. Here's how to work out what you actually need, activity by activity.
What each activity really uses
Bandwidth needs are surprisingly modest. These are widely accepted ballpark figures — the kind streaming services and video-call providers publish in their own help pages:
| Activity | Approx. bandwidth per device |
|---|---|
| Web browsing & email | 1–5 Mbps |
| Music streaming | under 1 Mbps |
| HD (1080p) video streaming | ~5 Mbps |
| 4K video streaming | ~15–25 Mbps |
| Video calls (Zoom, Teams, Meet) | ~2–4 Mbps each way |
| Online gaming (actual gameplay) | under 1 Mbps — but low ping matters |
| Game/console downloads | uses whatever you give it |
| Smart home devices | negligible — a few Kbps each, idle most of the time |
The pattern: a single 4K stream — the hungriest everyday activity — needs about 25 Mbps. Everything else is small. The exceptions are big downloads (game updates, OS updates, cloud restores) where more speed genuinely means less waiting.
Why gaming is the odd one out
Online play itself sips bandwidth — usually well under 1 Mbps. What ruins games is high or unstable latency, not a small pipe. Upgrading from 100 Mbps to 1 Gbps will not lower your ping at all. If games feel laggy on a fast plan, the problem is jitter or packet loss; our gaming speed test guide covers how to diagnose that properly.
Sizing by household
Add up your simultaneous peak usage — the worst realistic evening — then leave comfortable headroom. A reasonable rule of thumb:
- 1–2 people, light use (browsing, HD streaming, a video call): 50–100 Mbps is plenty.
- Family of 3–4 (a 4K stream, an HD stream, gaming, calls at once): 100–300 Mbps covers it comfortably.
- Heavy household (multiple 4K streams, several remote workers, frequent big downloads): 300–500 Mbps.
- Gigabit mainly buys faster downloads and future-proofing. Useful if you move huge files regularly; otherwise it's mostly headroom you'll rarely touch.
Don't forget upload
Advertised plans quote download speed, but video calls, cloud backup and live streaming depend on upload — which cable plans often skimp on. If you work from home, check the upload figure before the download one. We've written a full breakdown in why upload speed matters.
Why most households overpay
Two reasons. First, ISPs price tiers so the jump to the next speed looks cheap per megabit, which nudges people upward even when the extra capacity goes unused. Second, people blame slow Wi-Fi on the plan. A 500 Mbps line reaching a far bedroom at 40 Mbps over congested 2.4 GHz Wi-Fi feels like a slow plan — but upgrading to gigabit changes nothing, because the bottleneck is in the house. Fixing router placement (see our router placement guide) is often worth more than the next plan tier.
How to check before you change plans
- Run a free NetStartr test on a wired connection to see what your line actually delivers.
- Re-test over Wi-Fi in the rooms you actually use. If wired is fast and Wi-Fi isn't, your plan is fine — your Wi-Fi needs work.
- Tally your household's realistic simultaneous peak from the table above.
- If your plan delivers more than roughly double that peak, you have room to downgrade and pocket the difference.
Speed you don't use is money you don't get back. Measure first, then buy the plan that matches your household — not the one with the biggest number.