What do the numbers mean?
Mbps and Gbps
Broadband speed is measured in megabits per second, written Mbps (you will also see Mbit/s or just "Mb"). One gigabit per second, or 1 Gbps, is 1,000 Mbps.
It helps to think of it as the width of a pipe, not the speed of the water. A wider pipe lets more through at once. That is why a faster package does not make a single web page appear noticeably quicker, but does let more people do more things at the same moment.
Megabits and megabytes are not the same
File sizes are measured in megabytes (MB) and gigabytes (GB). Broadband is measured in megabits. There are eight bits in a byte, so to work out how quickly a file will download, divide your speed in Mbps by eight.
On a 100 Mbps connection you can download about 12.5 megabytes every second. A 50 GB video game is 50,000 MB, so:
| Download speed | Megabytes per second | Time to download a 50 GB game |
|---|---|---|
| 40 Mbps | 5 MB | About 2 hours 45 minutes |
| 100 Mbps | 12.5 MB | About 1 hour 7 minutes |
| 500 Mbps | 62.5 MB | About 13 minutes |
| 1 Gbps | 125 MB | About 7 minutes |
These are best-case figures that assume the full speed is available to one device and the server sending the file can keep up.
This table shows where high speeds earn their keep: big downloads. It is waiting time you are buying, not smoother streaming.
Download, upload and latency
Download speed
Download speed is how quickly data travels from the internet to you. It governs streaming, browsing, and downloading files, games and software updates. It is the number in every advert.
Upload speed
Upload speed is how quickly data travels from you to the internet. You use it when you:
- appear on a video call, since your camera picture is being sent out
- back up photos or files to cloud storage
- send large email attachments or share documents
- post videos or live-stream
Most connections are asymmetric, meaning upload is much lower than download. On a part-fibre line, where a copper phone wire covers the last stretch to your home, upload is typically a small fraction of download. Cable connections are similar. Full fibre is far better in this respect: Openreach's fastest home product offers 120 Mbps upload alongside 1.8 Gbps download, and many of the smaller full fibre networks sell symmetric packages, where both figures are equal.
If you are not sure which technology you have, full fibre broadband explained describes each type and how to tell.
Latency (ping)
Latency is the time it takes for a small piece of data to travel to a server and back. It is measured in milliseconds (ms) and often called "ping". Lower is better.
Latency is about responsiveness, not capacity. A connection with high latency feels sluggish even when the Mbps figure is large, because every action waits for a round trip. It matters most for:
- Video and voice calls. High latency causes people to talk over one another.
- Online gaming. The delay between pressing a button and seeing the result.
- Anything interactive, such as remote desktop software for work.
It matters very little for streaming films or downloading files, which are buffered in advance.
Full fibre generally has the lowest latency of the fixed-line technologies. The comparison site Choose, citing Ofcom's performance research, reports typical figures of roughly 5–9 ms on full fibre against 12–15 ms on cable. Satellite and mobile broadband are usually higher and more variable. A related term, jitter, describes how much latency varies from moment to moment. Steady latency is as important as low latency for calls and games.
What "busy time" speed means
Networks are shared, so speeds can dip in the evening when the whole street is online. Ofcom's last home-broadband measurement study, using tests from March 2023, found that the average download speed between 8pm and 10pm was about 95% of the maximum, and that full fibre lines were the least affected by congestion. A small dip is normal. A large one every evening is worth raising with your provider.
How much speed do everyday activities need?
The best guide is what the services themselves publish.
| Activity | Download needed | Upload needed | Source |
|---|---|---|---|
| Streaming in HD (720p) | 3 Mbps | Negligible | Netflix |
| Streaming in Full HD (1080p) | 5 Mbps | Negligible | Netflix |
| Streaming in 4K (Ultra HD) | 15 Mbps | Negligible | Netflix |
| Group video call, 720p | 1.8 Mbps | 2.6 Mbps | Zoom |
| Group video call, 1080p | 3.0 Mbps | 3.8 Mbps | Zoom |
| Web browsing, email, music | A few Mbps at most | Negligible | General guide |
| Online gaming (playing) | Low; latency matters more | Low | General guide |
| Downloading games and updates | As much as you have | Negligible | General guide |
Netflix and Zoom figures as published on their support and developer pages, checked 13 November 2026. Other streaming and calling services publish similar requirements.
Two things stand out. First, the numbers are small. Ofcom's own advice on the legal minimum "decent" connection of 10 Mbps is that it lets several people use the internet at once, including streaming video. Second, video calls are the only common activity where upload is larger than download.
Worked examples: four households
The method is simple. List what could be happening at your busiest moment, add up the download and upload separately, then double the total. The doubling covers background activity you do not see, such as phones updating apps, smart speakers, doorbell cameras and consoles downloading patches, and it leaves room for growth.
One or two people, light use
A couple who browse, stream and make the occasional video call.
- One 4K stream: 15 Mbps
- A second person browsing or on a phone: around 5 Mbps
- Peak download: about 20 Mbps. Peak upload: under 4 Mbps when on a call.
Doubled, that is 40 Mbps. An entry-level package of 30–75 Mbps is enough. On a part-fibre line that delivers a reliable 35 Mbps or more, this household may notice no practical difference from a faster package, though they would still gain reliability from full fibre.
Four people, two working from home
Two adults who are often on video calls at the same time, a teenager who games, and a younger child who streams.
Weekday daytime:
- Two 1080p group video calls: 6 Mbps down, 7.6 Mbps up
- Cloud back-up or file sync running on a work laptop: can use whatever upload is spare
- A child streaming in HD: 5 Mbps
Evening:
- Two 4K streams: 30 Mbps
- One HD stream on a tablet: 5 Mbps
- Gaming and phones: around 10 Mbps
- Peak download: about 45 Mbps
Doubled, that is 90 Mbps of download, so a package of 100–150 Mbps is comfortable. The more important figure is upload. Nearly 8 Mbps for calls alone is close to, or beyond, everything a typical part-fibre line can send, which is why calls break up when someone else starts uploading. On full fibre the upload allowance at this tier is usually several times larger, and the problem goes away.
A shared house of five adults
Five people with separate rooms, each likely to be streaming or on a call independently.
- Five 4K streams at once: 75 Mbps
- Two video calls: 6 Mbps down, 7.6 Mbps up
- Background activity on fifteen or more devices: 10–20 Mbps
- Peak download: about 100 Mbps
Doubled, that is 200 Mbps. A package of 300–500 Mbps gives everyone room and means one person's large download does not spoil the evening for the rest. In a house like this, Wi-Fi coverage across several rooms will matter at least as much as the speed of the line.
A home worker who sends large files
A video editor, photographer or designer who regularly uploads large files to clients.
Here download is almost beside the point. What matters is how long uploads take. For a 20 GB video file:
| Upload speed | Time to upload 20 GB |
|---|---|
| 10 Mbps | About 4 hours 27 minutes |
| 100 Mbps | About 27 minutes |
| 500 Mbps | About 5 minutes |
For this person, a symmetric full fibre package is worth far more than a higher download figure. It is the clearest case for choosing a network by its upload speeds, which our guide to UK fibre networks covers.
Which speed tier suits which household?
| Package speed (download) | Suits | Be aware |
|---|---|---|
| 30–75 Mbps | One or two people; light to moderate streaming and browsing | On part fibre, upload will be low and actual speed depends on your distance from the street cabinet |
| 100–150 Mbps | Most families; two home workers; several streams at once | The sweet spot for many households on full fibre |
| 300–500 Mbps | Large households and house shares; frequent big downloads | Your Wi-Fi may not deliver this to every room |
| 900 Mbps–1 Gbps | Very heavy use; many large downloads; people who want maximum headroom | Few single devices can use it all over Wi-Fi |
| Above 1 Gbps | Specialist needs | Needs suitable router, cabling and devices to benefit |
These bands are a guide, not a rule. Ofcom's figures suggest most households do not buy the top tier: its Connected Nations 2025 report put the average of the maximum speeds on UK lines at 285 Mbps in July 2025, a figure pulled up by a minority on gigabit packages.
When you compare packages, weigh the price difference between tiers against what you would gain. Moving from 150 to 500 Mbps often costs only a few pounds a month, but if nothing in your home will use it, that is still money spent on nothing. How to choose and switch broadband covers the pricing side.
Advertised speed vs the speed you get
The speed in an advert is not a promise for your address. What counts is the estimate you are given for your own line before you buy.
Under Ofcom's voluntary Broadband Speeds Code of Practice, providers that have signed up must give you, at the point of sale:
- a minimum guaranteed download speed for your line
- an estimate of the speed you are likely to get at peak time, which for homes means 8pm to 10pm
If your speed later falls below the guaranteed minimum because of a problem on the provider's network, and they cannot fix it within 30 days, you can leave the contract without paying an exit fee. That right extends to services bought together with the broadband.
When we checked in November 2026, Ofcom listed the signatories as BT, EE, NOW Broadband, Plusnet, Sky, TalkTalk, Utility Warehouse, Virgin Media and Zen Internet. If your provider is not on the list, ask what speed guarantee, if any, it offers.
Keep the speed estimate you were given when you signed up. It is the figure any later complaint will be measured against.
You may also see speed bands used to describe coverage. Ofcom uses "decent" for at least 10 Mbps download and 1 Mbps upload, "superfast" for 30 Mbps or more, "ultrafast" for 300 Mbps or more, and "gigabit-capable" for 1,000 Mbps or more.
Why Wi-Fi is often the real bottleneck
Your broadband speed is measured at the router. What reaches your laptop in the back bedroom is a different matter. Wi-Fi is a radio signal, and it weakens with distance and every wall, floor and large object it passes through.
Ofcom makes the point both ways: Wi-Fi can never outperform the broadband service feeding it, but poor Wi-Fi can throw away most of a good connection. A household paying for 500 Mbps and receiving 30 Mbps in the room where they work does not have a broadband problem.
How to tell whether it is the line or the Wi-Fi
- Connect a laptop or computer directly to the router with an Ethernet cable (a network cable; most routers come with one).
- Close other programmes and ask others in the house to pause what they are doing.
- Run a speed test. Many are free online, including from price-comparison sites accredited by Ofcom.
- Repeat at different times of day, including the evening.
- Then run the same test over Wi-Fi in the rooms where you have trouble.
If the wired result matches what you are paying for and the Wi-Fi result is far lower, the line is fine and the Wi-Fi needs attention. If the wired result is well below your guaranteed minimum, contact your provider.
Wi-Fi standards set a ceiling
The age of your router and devices matters. Ofcom's guidance gives these typical maximum speeds:
| Wi-Fi standard | Radio bands | Typical maximum speed |
|---|---|---|
| Wi-Fi 3 (802.11g) | 2.4 GHz | About 20 Mbps |
| Wi-Fi 4 (802.11n) | 2.4 GHz and 5 GHz | About 100 Mbps |
| Wi-Fi 5 (802.11ac) | 5 GHz | About 200 Mbps |
| Wi-Fi 6 (802.11ax) | 2.4 GHz and 5 GHz | 600 Mbps and above |
Source: Ofcom, "Improving your wifi", published 19 February 2024. Newer standards, Wi-Fi 6E and Wi-Fi 7, have since reached the market and are faster again.
Both ends of the link have to support a standard to use it. A new router will not make a ten-year-old laptop any faster. The lower 2.4 GHz band reaches further but carries less; the 5 GHz band is faster but fades more quickly through walls.
Practical fixes, cheapest first
- Move the router. Put it somewhere central and raised off the floor. Keep it away from radiators, water (including fish tanks), metal and glass, all of which weaken the signal. A cupboard under the stairs is a poor place for it.
- Reduce interference. Microwaves, baby monitors, cordless phones and even fairy lights can interfere.
- Use a cable for things that do not move. A television, games console or desktop computer wired to the router gets the full speed and frees up Wi-Fi for everything else.
- Check the router's age. If it is several years old, ask your provider whether a newer model is available.
- Add a mesh system for larger homes. Mesh Wi-Fi uses several units placed around the house to create one network. Ofcom notes it improves coverage without reducing the performance of the broadband connection. Ofcom's guidance, written in 2024, put starter kits at about £60 to over £200.
- Be cautious with cheap extenders. Boosters and repeaters amplify the signal but can reduce speed and responsiveness. Powerline adapters, which send data over your home's electrical wiring, started at around £20 in the same guidance, but results depend on the wiring.
If you are about to have full fibre installed, you get one chance to choose where the equipment goes. Our installation guide explains how to pick a spot that gives the Wi-Fi the best start.
Do you need gigabit broadband?
A gigabit package, around 1,000 Mbps, is far more than current household activities require. Its real benefits are:
- Large downloads finish in minutes. A 50 GB game in about seven minutes instead of over an hour at 100 Mbps.
- Nobody notices anybody else. One person's download cannot crowd out the rest of the house.
- Higher upload comes with it. On many networks the top download tier also carries the best upload speed.
Against that, almost no single device will see the full speed over Wi-Fi, and the extra cost recurs every month. Data use is rising steadily. Ofcom reported average monthly use of 738 GB on full fibre lines in July 2025. But rising data use mostly reflects more hours of streaming, not a need for faster lines.
A sensible approach on full fibre is to start on a mid-range package. Because the fibre cable already has the capacity, moving up a tier later usually needs no engineer visit.
Frequently asked questions
What is a good broadband speed for a home in the UK?
For most households, 50–150 Mbps download is plenty. It covers several 4K streams, video calls and general use at once with room to spare. Larger households, or people who download very large files often, may prefer 300 Mbps or more.
Is 100 Mbps fast enough?
Yes, for most homes. 100 Mbps supports six 4K streams at once on paper. What matters more at this level is your upload speed if you work from home, and whether your Wi-Fi delivers that speed to the rooms you use.
What is the difference between Mbps and MB?
Mbps (megabits per second) measures connection speed. MB (megabytes) measures file size. There are eight megabits in a megabyte, so a 100 Mbps connection downloads about 12.5 MB each second.
Why is my broadband slower than advertised?
Common reasons are weak Wi-Fi, an old router or device, many devices sharing the connection, evening congestion, or, on part-fibre and copper lines, the distance from the street cabinet or exchange. Test with a cable plugged into the router to see what the line itself delivers.
What upload speed do I need for working from home?
A single high-quality video call uses up to about 4 Mbps of upload. Two people on calls with files syncing in the background can use 10 Mbps or more. If you regularly send large files, look for the highest upload you can get, ideally a symmetric full fibre package.
What is a good latency or ping?
Lower is better, and steadiness matters as much as the figure. Fixed-line connections, especially full fibre, usually deliver latency low enough for calls and gaming. Satellite and mobile broadband tend to be higher and more variable.
Does faster broadband improve Wi-Fi?
No. A faster package increases what arrives at the router. It does nothing for signal strength in distant rooms. If the problem is coverage, moving the router or adding a mesh system will help more than a faster package.
Can I leave my contract if my speed is too slow?
If your provider has signed Ofcom's speeds code and your speed drops below the minimum you were guaranteed because of a fault on its network, it has 30 days to fix it. If it cannot, you can leave without an exit fee.
How do I test my broadband speed properly?
Plug a computer into the router with a cable, stop other devices using the connection, and run an online speed test. Repeat at several times of day over a few days. Wi-Fi tests on a phone tell you about your Wi-Fi, not your line.
Sources
All sources accessed 13 November 2026.
- Broadband speeds code of practice — Ofcom
- Improving your wifi experience — Ofcom
- Practical tips for improving your broadband speed — Ofcom
- Latest home broadband performance trends revealed — Ofcom
- Your right to request a decent broadband service: what you need to know — Ofcom
- Connected Nations UK Report 2025 — Ofcom (PDF)
- Netflix-recommended internet speeds — Netflix Help Centre
- System requirements (bandwidth) — Zoom Developer Docs
- BT Wholesale make 1.8Gbps FTTP broadband available to UK ISPs — ISPreview
- Fastest broadband in the UK (2026) — Choose
General information for UK households, not legal or financial advice. Facts checked on 13 November 2026; prices, coverage and rules change, so confirm details with a provider before you sign up.