Download Speed Test

Download Speed Test – How Fast Are Your Downloads, Really?

Your download speed decides how your broadband feels day to day: how quickly films start, how long a game update takes, whether three people can stream at once without an argument. This download speed test measures that one number properly – in your browser, in about fifteen seconds, with nothing to install and no account to create. It is part of Speed Test UK, our free set of UK connection tools.

Press Start above and the test does three things. First it measures your ping and jitter with a series of tiny requests, so you can see how responsive your connection is. Then it downloads data over several parallel streams for ten seconds and works out your sustained download speed in megabits per second (Mbps), leaving out the first second while the connection ramps up. That gives you a figure you can fairly compare with the speed your provider sold you.

One honest warning before you start: any browser test measures the device you are holding, on the connection it has right now. Test on a laptop plugged into your router and you are measuring your line. Test on a phone two rooms away and you are measuring your line plus your Wi-Fi plus your walls. Both numbers are useful – just know which one you are looking at before you judge your provider.

How to Run This Download Speed Test Properly

A fair test takes two minutes of preparation and saves a great deal of confusion afterwards. Follow these steps:

• Pause everything else. Stop streaming, game downloads, cloud backups and video calls on every device for a minute. One 4K stream can use 15–25 Mbps by itself, and a console update can use all of a slower line.
• Decide what you are testing. For a verdict on your line, connect a laptop to your router with an Ethernet cable. For a verdict on your everyday experience, stay on Wi-Fi exactly where you normally sit.
• Close heavy apps and tabs. Browsers syncing files, backup tools and meeting software all take a share of the connection while the test runs.
• Press Start and let it finish. The test needs its full download window; switching tabs or locking your phone screen mid-test can distort the result.
• Note the three numbers. Download, ping and jitter, plus the time of day and whether you were wired or on Wi-Fi. One result is a snapshot; a small log is evidence.
• Repeat at a different time. Run it once in the daytime and once in the evening peak. The comparison tells you more than either result alone.

If the figure surprises you, cross-check it with our full broadband speed test, which also measures upload in depth. And if pages are not loading at all rather than loading slowly, use is my internet working first – an outage needs a different response from a slow line.

What Your Download Speed Result Means

Download speed is measured in Mbps – megabits per second. Streaming services, web pages, app updates and game downloads all pull data down this pipe. The table below translates a test result into everyday terms. Judge your own result against the package row further down this page, because “good” depends entirely on what you pay for.

Remember that downloads are shared. A 67 Mbps line serving one person feels generous; the same line serving two 4K streams, a video call and a game download at 8pm is simply full. If your evening result is far below your morning result on a wired connection, that pattern – not any single reading – is what matters.

Why ping and jitter appear next to your download result

Plenty of download tests show one number and stop. We show ping (response time) and jitter (how much that response time wobbles) alongside, because they explain the common complaint of “my speed test is fine but everything feels slow”. Downloads can be fast while calls still crackle, if jitter is high. Under 20 ms ping with jitter in single figures is a healthy UK connection; ping regularly above 80–100 ms, or jitter above 30 ms, points to Wi-Fi trouble or congestion. Dig deeper with our ping tester and jitter test if those numbers look wrong.

Download Speeds You Should Expect from UK Packages

UK broadband falls into two families. Part fibre (FTTC) runs fibre to a street cabinet and copper the rest of the way, and tops out around 80 Mbps – with your real speed depending on the length and condition of that copper run. Full fibre (FTTP) brings fibre to a box on your wall and is far more consistent, from 100 Mbps up to gigabit and beyond. Providers must advertise speeds achievable by at least half of customers at peak time, and your order confirmation contains a personalised estimate and a minimum guaranteed speed for your specific line. That guarantee is your real benchmark.

As a rough guide on a wired test: BT, Sky, TalkTalk, EE and Plusnet part-fibre packages cluster around 36 Mbps (entry) and 67 Mbps (faster tier). Their full fibre ladders run 100/150, 300, 500 and 900 Mbps, with uploads roughly a tenth of the download on the lower tiers and around 110 Mbps at the top. Virgin Media’s cable tiers (M125 to Gig1) download faster at each price point but upload far less. Zen’s full fibre range mirrors the Openreach ladder. Our what is a good download speed guide works through what each household size actually needs, and the UK broadband providers hub links to a dedicated test for each network.

Why Is My Download Speed Slower Than Expected?

Work through these causes in order – they explain the great majority of disappointing results, and most are fixable in minutes.

• You tested over Wi-Fi. Wi-Fi loses speed to distance, walls, floors and neighbours’ networks, especially on the crowded 2.4 GHz band. Test beside the router, then wired, before blaming the line. Our Wi-Fi speed test guide helps you map the loss room by room.
• The house was busy. A partner’s 4K stream, a child’s game update and a cloud photo backup together can halve a part-fibre result. Test with everything paused.
• It is peak time. Between about 7pm and 10pm, whole streets are online. Part-fibre areas feel this most. A modest evening dip is normal; a nightly collapse is a pattern worth reporting.
• Your device is the limit. An old laptop, a 100 Mbps Ethernet port, a tired cable or a budget phone cannot show a gigabit line properly. Gigabit plans need a gigabit-capable wired connection to prove themselves.
• Router position or age. A router in a cupboard, behind the TV or on the floor underperforms. So does one that has not been restarted in months – restart it once, let it settle, and retest.
• A real line fault. Speeds that halve suddenly and stay halved, dropouts, or crackling on a landline (part-fibre) point outside the home. On full fibre, check the optical box lights: a red LOS light means the fibre signal itself is lost.

A useful rule of thumb: if wired results are right and Wi-Fi results are wrong, spend your effort on router position and coverage. If wired results are wrong too, gather your log and talk to your provider.

How This Test Works – and Why Results Differ Between Tests

This test streams data from Cloudflare’s edge network – the same global infrastructure behind Cloudflare’s own speed test – over four parallel connections for ten seconds, counting every byte as it arrives. The first second is excluded from the final figure because every connection starts slowly and ramps up; including it would flatter nobody and understate fast lines. Your ping is the median of repeated tiny requests, which keeps one stray slow request from skewing it.

Different tests give slightly different answers because they use different servers, file sizes, stream counts and timings. That is normal, and chasing identical numbers across five sites wastes an evening. What matters is consistency: use one test, one device, one method, and watch the pattern. If your result here is far below every other test you try, test wired and re-run – if the gap persists across days, it is information, not noise.

Below Your Minimum Guaranteed Download Speed?

When you joined your provider you were given a minimum guaranteed speed for your line. The major UK providers are signed up to Ofcom’s Broadband Speeds Code of Practice: in general terms, if fairly measured speeds stay below that minimum, you can report it, the provider gets a period to fix the problem (commonly 30 days from when the fault is reported and confirmed), and if speeds still cannot be restored you can normally leave without an early termination charge.

Build your case first: at least three wired tests, on different days, including an evening test, noting the time and result each time. Keep your order confirmation with the guaranteed figure. For impartial background on the code and on Wi-Fi problems, see Ofcom’s broadband and Wi-Fi help; for what is realistically available and achievable in your area, Thinkbroadband and Openreach are the references providers themselves use.

Download Speed Test FAQs

What is a good download speed in the UK?

For one person streaming and working, 35–70 Mbps is comfortable. A busy family with several 4K streams should look at 100–300 Mbps. Gigabit packages suit very heavy homes and people who download huge files often. Judge your result against your own package first – a wired 62 Mbps on a 67 Mbps package is a healthy line doing its job.

Why is my download speed lower over Wi-Fi than wired?

Because Wi-Fi is a shared radio signal that weakens through walls and floors and competes with your neighbours’ networks. A drop of 10–30% in the same room is common, and far more in a distant bedroom. That gap is a home coverage issue, not a line fault – the wired result is what your provider is responsible for.

How accurate is this download speed test?

Accurate enough to judge your line and build a case, provided you test fairly: wired, with other traffic paused, repeated a few times. No browser test is laboratory-perfect, and results naturally vary a little between runs. Persistent results far below your guaranteed minimum, measured this way, are reliable evidence.

Why does my download speed change during the day?

Demand changes. Mornings are quiet; evenings are when your household and your whole street go online together, which shows most on part-fibre lines. Full fibre varies far less. Log a morning and an evening wired result for a few days and you will see your line’s real personality.

Does a faster download speed fix buffering and lag?

Only partly. Buffering is usually about download headroom or Wi-Fi; lag in games and stutter on calls is about ping and jitter, not download speed. If your download figure is healthy but games lag, test your latency properly rather than paying for a faster tier.

How much data does this test use?

It depends on your speed: roughly ten seconds of downloading at full rate. On a 100 Mbps line that is about 100 MB; on gigabit, several hundred MB. The tool shows the amount used after each run. On a capped mobile connection, run it once and sparingly.

Test Again Tonight – and Keep the Log

One test tells you where you stand now; a week’s worth tells you the truth. Run this free UK speed test again at your busiest time tonight, note both results, and compare them with your package and your guaranteed minimum. If the wired numbers hold up, your line is healthy and any remaining frustration lives in your Wi-Fi, where it can usually be fixed cheaply. If they fall short night after night, you now hold exactly the evidence a provider needs to act.