This question is nearly always answered the wrong way round: by looking at the plans on offer and picking the middle one.
The cheaper and more accurate approach is the reverse, work out what actually happens in the house, then find the plan that covers it.
The number often surprises.
What each activity really needs
The figures below are for one device doing one thing:
| Activity | Download | Upload |
|---|---|---|
| Messaging and social media | 1 Mbps | 0.5 Mbps |
| Standard-definition video | 3 Mbps | - |
| Full HD video | 5 Mbps | - |
| 4K video | 15–25 Mbps | - |
| Video meeting, camera on | 3 Mbps | 3 Mbps |
| Online gaming | 3 Mbps | 1 Mbps |
| Online classes | 3 Mbps | 2 Mbps |
| Security camera, each | - | 2–4 Mbps |
What stands out: online gaming barely needs speed at all. What it needs is low delay, an entirely different thing, and one that doesn't improve with a bigger plan. The distinction is explained in the guide to bandwidth, latency, and throughput, and for players themselves the guide to gaming routers covers what actually helps.
Working it out for a household
The commonest error is adding up everyone's peak demand. Four people who could each watch 4K doesn't mean you need 100 Mbps, because all four never watch 4K simultaneously all evening.
A method closer to reality:
- List what genuinely overlaps during your busiest hour. Usually seven to ten in the evening.
- Add the figures from the table above.
- Add about 50 per cent headroom for updates, automatic backups, and things running unseen.
For illustration, a household of four in the evening:
- One television playing 4K, 20 Mbps
- One person watching Full HD on a phone, 5 Mbps
- One person gaming online, 3 Mbps
- One person on social media, 1 Mbps
That totals 29 Mbps. With headroom, about 45 Mbps. A 50 Mbps plan covers it comfortably, and a 300 Mbps plan will never be fully used.
The part most often overlooked
Advertising quotes one large number, and it's almost always download. Upload appears in small print, or not at all.
Yet for a home used for work, upload is what decides. Video meetings send your picture out; files go out; automatic backups upload all day. All of it travels a path that's usually much narrower.
Why the two directions are unequal is explained in the guide to why upload is slower than download. What to remember when choosing a plan: check the upload figure, and for a home used for work, 10 Mbps of upload is worth more than another 200 Mbps of download.
Security cameras deserve counting separately. Four cameras uploading continuously can occupy the upload path all day, and that's what makes video meetings stutter for no obvious reason, see the guide to CCTV camera security.
When "slow" isn't about speed
This is the part that saves the most money. Most complaints about slowness don't improve with a bigger plan, because the problem isn't there.
| Symptom | Most likely |
|---|---|
| Slow only in certain rooms | Wi-Fi coverage |
| Slow at the same time daily | Provider congestion |
| Slow on one device only | That device |
| Video stutters, pages load fast | Upload path saturated |
| Everything slow, all day | Only now consider the plan |
The first four rows won't shift at all with a larger plan. Each has its own remedy: the guide to fixing slow Wi-Fi, the guide to slowdowns at certain hours, the guide to single-device problems, and the guide to full signal but slow internet.
Limits the plan doesn't show
Even when the plan really is large, three other things can throttle it before it reaches your device:
- A router older than the plan. An old router can't forward 300 Mbps even when the line can, see the guide to when a router should be replaced.
- Wi-Fi rather than cable. Advertised speeds are measured over cable. Through the air, a room away, the number is very different.
- LAN cable that can't keep up. Old cable caps a link at 100 Mbps even when both ends are gigabit, see the guide to choosing LAN cable.
So speed tests are best run over cable first, as in the guide to checking internet speed. If cable matches the plan but Wi-Fi doesn't, the subscription isn't what needs fixing.
When upgrading is genuinely right
Three situations really call for it:
- A cabled test shows the line saturated at peak hours, repeatedly.
- The household has genuinely grown.
- A genuinely heavy new activity: several security cameras, large daily uploads, or live streaming.
For business premises the calculation differs, because what decides isn't comfort but the cost of stopping, see the guide to choosing a business internet plan.
The bottom line
A household of four rarely genuinely needs more than 50 Mbps. A larger figure does no harm, but it also changes nothing you'd notice.
Two things matter more than the number in the advert: upload speed, especially in a home used for work, and Wi-Fi coverage inside the house. Money spent upgrading from 100 to 300 is almost always more noticeable if spent improving one of those instead.
Frequently asked questions
How many Mbps is enough for a family?
For a household of four watching video, working, and occasionally gaming, 50 Mbps is more than enough. That surprises people because the plans on sale sit well above it, but everyday activity genuinely doesn't demand as much as assumed.
Why is the internet still slow on a large plan?
Because what people call "slow" is usually not about speed but about delay, weak Wi-Fi coverage, or an ageing device. Upgrading the plan solves a problem you don't have and leaves the one that actually bothers you.
How much does upload speed matter?
Far more than the advertising suggests. Video meetings, sending files, and automatic backups all use the upload path, and on most connections that path is much narrower than the download one. A home used for work notices an upload improvement more than a download one.
Should I add up the requirements for everyone in the house?
No. Adding everyone's peak demand produces a figure far above anything ever used, because nobody peaks at the same second. Count activities that genuinely overlap, then add reasonable headroom.
