How to Test Your Internet Speed (and What Mbps You Actually Need)

An internet speed test measures three separate things, and mixing them up is why "my internet is slow" complaints so often don't match what the test reports. A connection can download quickly and still make video calls stutter, or have modest bandwidth and feel instant. This guide explains what each number means, how to run a test that tells you something useful, what speeds different activities really need, and how to work out whether the problem is your provider, your Wi-Fi or your device.

What a speed test measures

• Download speed (Mbps): how fast data reaches you. It determines streaming quality, page loading and how long downloads take. This is the headline number on your internet plan.
• Upload speed (Mbps): how fast data leaves you. It matters for video calls (your camera feed), sending large files, backing up to the cloud and live streaming. On many home connections it is a fraction of the download speed.
• Ping, or latency (ms): the round-trip time for a small message to reach a server and come back. It is responsiveness rather than capacity, and it is what you feel in games, video calls and how snappy browsing seems.

Mbps means megabits per second. File sizes are usually given in megabytes, and a byte is 8 bits, so a 100 Mbps connection downloads at most about 12.5 megabytes per second.

How to run a useful speed test

1. Pause anything else using the connection: downloads, cloud backups, streaming on other devices and game updates.
2. Open the Speed Test tool and start the test. It transfers data in both directions to measure download, upload and ping.
3. Read the results in Mbps and milliseconds, and compare them with what your plan advertises.
4. Run the test two or three times. A single result can be skewed by a momentary blip.

What speed do you actually need?

Add up what happens at the same time in your home. Two 4K streams, a video call and a few phones browsing fit comfortably into 100 Mbps. For most households, stability matters more than a bigger headline number.

Reading ping

• Under 20 ms: excellent, with no perceptible delay.
• 20–50 ms: good for everything, including competitive gaming.
• 50–100 ms: fine for browsing and streaming; noticeable in fast games.
• Over 100 ms: calls get awkward pauses and games feel laggy, however high your bandwidth.

Ping depends partly on distance: a server on another continent always adds delay. It also rises when your connection is busy. If calls fall apart whenever someone in the house starts a big download, the connection is getting congested (sometimes called bufferbloat). A router with quality-of-service (QoS) settings can prioritise calls and games.

Why your results are lower than your plan

Plans advertise "up to" speeds, measured over a cable to the router. Real-world results lose speed at several points:

• Wi-Fi: the most common culprit. Distance, walls, floors, microwaves and neighbouring networks all cut speed, and older devices can't use the fastest Wi-Fi standards.
• The device: an old laptop, a busy browser with dozens of tabs, or a VPN can cap the result.
• Time of day: evenings are peak hours on most networks, and congestion slows everyone.
• Other users: anything else on your network shares the same connection.

Is it your provider or your Wi-Fi?

1. Test on a device connected to the router with an Ethernet cable, or standing right next to the router.
2. Test again from the room where you have problems.
3. If the speed is good at the router but poor elsewhere, the issue is Wi-Fi coverage. Move the router somewhere central and high, use the 5 GHz band nearby, or add a mesh system.
4. If the speed is poor even on a cable at the router, restart the router and test again. If it is still well below your plan, the issue is the line or the provider.

Getting your provider to take it seriously

Support teams answer one-off complaints with "restart your router". A log is much harder to deflect. Test on a wired connection at the same times each day, including evenings, over several days, and note the date, time, download, upload and ping. A consistent pattern of results far below your plan, measured on a cable, is evidence that the problem is on their side.

Frequently asked questions

Why are my upload speeds so much lower than download?

Many connections, especially cable, DSL and some fibre plans, are asymmetric by design, because most households download far more than they upload. Symmetric fibre plans offer equal speeds both ways.

Why do different speed test sites give different results?

Each test measures against its own servers, in different places, using different methods. Compare results from the same test over time rather than between tests.

Does a VPN slow my connection?

Usually somewhat, because traffic takes a detour through the VPN server and is encrypted. Test with it on and off to see the difference.

Does restarting the router actually help?

Often, yes. It clears memory and stuck connections, and on some lines it renegotiates a better connection. It is worth trying before anything else.