How to test your broadband speed and use the results

A useful speed test starts with a fair test.

The answer in 2 lines. Connect a suitable computer to your router with an Ethernet cable, pause other internet activity and repeat the test at different times. Keep dated results and compare them with the address-specific speeds supplied when you signed up, especially any minimum guaranteed download speed. A wireless test is useful for checking your experience in a room, but cannot by itself establish that the broadband line is faulty. In England, your next step is your provider’s fault process, followed by a formal complaint if necessary.

Get a useful baseline

Follow Ofcom’s advice on accurate testing: connect a computer directly to the router using Ethernet where possible.
Pause streaming, downloads and cloud backups on other devices. Note whether anything else was using the connection during the test.
Repeat at different times and save the date, time, connection method and results. Then compare with the speed information in your contract confirmation.

Stop: danger

Keep wireless results in context: a low result from a distant room may reflect Wi-Fi coverage rather than the incoming broadband service.
Do not change the contract yet: buying a faster package may not solve a weak wireless signal.
Keep fault reporting separate from cancellation: report the problem and follow the diagnostic process before assuming you can leave without an exit charge.

Choose a test and record how it works

Start with Ofcom’s broadband and Wi-Fi troubleshooting guide. Work through its testing advice, then ask your provider which diagnostic test it needs for a fault investigation.

If the provider offers an account-based line test, ask whether it measures the connection to the router or the connection to your device. These answer different questions. A browser test on your computer includes the computer and its connection to the router.

Record the test method alongside the result. Keep the method consistent when comparing different times, then change the cable or device separately if you need to investigate a possible equipment limit. You do not need to buy an upgrade simply to report a problem.

Read the results without chasing a perfect score

Download speed: how quickly data reaches you. It affects downloads, streaming and sharing the connection between devices.
Upload speed: how quickly you send data. It matters for video calls, sending files and online backups.
Latency: response delay, usually shown in milliseconds. Longer delays can affect interactive use even when download speed looks healthy.

Speed results are commonly shown in Mbps. Do not compare them directly with a download application’s file-transfer figure unless the units match. See Ofcom’s jargon guide to check unfamiliar connection terms.

There is no single pass mark for every household. Compare with your own service information and describe the practical problem: calls freezing, slow uploads or repeated disconnections.

What not to do

Running a test while another device is downloading a large file, then treating it as the connection’s full capacity.
Comparing a wireless phone result with a wired computer result without recording the difference.
Using a single screenshot as proof that a fault is persistent.

Use the contract’s speed information

Find your personalised estimate and any minimum guaranteed download speed. Ofcom’s speeds guidance explains the voluntary code and identifies participating providers; check whether your service is covered.

Under that framework, a qualifying network speed problem below the minimum guarantee can give you a right to leave without penalty if the provider cannot fix it within 30 calendar days. Report the fault, cooperate with checks and ask the provider to confirm when the repair period starts. This is not an automatic refund or cancellation right triggered by a single low Wi-Fi reading.

Turn your measurements into a complaint

Send the provider your dated results, test method, contractual speed information and a description of the disruption. Ask for a fault reference, the investigation findings and the proposed remedy. Keep subsequent correspondence with the measurements.

If support does not resolve it, make a formal complaint. Follow Ofcom’s complaint steps if the service was misrepresented: ask for a deadlock letter when agreement cannot be reached, or use the linked ADR checker after six weeks unresolved. The independent scheme considers your individual dispute; reporting a concern to Ofcom does not itself settle your claim.

Good to know

These broadband consumer protections operate across the UK; this guide is written for households in England.
Good wired results alongside poor wireless results suggest investigating the home Wi-Fi connection before changing broadband package.
A connection can feel unreliable even when a speed test looks acceptable. Log disconnections and affected activities as well as measured speeds.

Illustrative example: Hannah’s video calls freeze in her spare room. Her wired tests near the router are consistently satisfactory, while wireless tests in that room are much poorer. She gives support both sets of results, clearly labelled, so the investigation focuses on wireless coverage before she considers a different package.

A made-up story, for illustration.

Bobby

Sources, verification, confidence

Verified on 6 November 2026, for England. Confidence: high for wired testing, distinguishing Wi-Fi from broadband and the conditional rights under the Broadband Speeds Code; medium for diagnosing an individual connection from test results alone. The repair and complaint periods are rules checked in 2026, not performance statistics.