To test your internet speed, open a speed test, close other downloads, and press start. It measures how fast data reaches your device and how long it takes to respond, reporting your download speed in megabits per second and your latency in milliseconds. The free internet speed test does this in your browser with a clear live readout.
That is all it takes. Getting a result you can trust takes a little care, which is what the rest of this guide is about.
Speed and latency, briefly
Two numbers describe a connection. Download speed, in megabits per second, is how much data can arrive at once; it governs how quickly pages, videos and files load. Latency, in milliseconds, is the delay before data starts moving; it governs how responsive a connection feels on calls and in games.
People fixate on download speed, but latency is often what makes a connection feel slow. A line with huge download speed and high latency still stutters on a video call, while a modest line with low latency feels snappy.
How to test your internet speed
Step 1: Clear the decks
Pause downloads, stop streaming on other devices, and close apps that sync in the background. The test measures whatever the connection is doing, so if a phone in another room is backing up photos, your result will look worse than the line really is.
Step 2: Run the test
Press start on the internet speed test. It checks latency first, then measures download speed, with the number climbing live as it goes. Let it finish before reading the result.
Step 3: Compare a few runs
Run it two or three times and look at the range rather than fixating on one figure. Speeds vary minute to minute, and an average across a few runs is far more honest than a single lucky or unlucky reading.
Why you rarely get the full plan speed
The number on your bill is a best case, measured at the socket with nothing in the way. Real life adds obstacles:
- Wifi. The single biggest factor for most people. Walls, distance and interference all cut wireless speed well below what the line delivers. A wired connection often shows dramatically higher numbers.
- The device. An old phone or laptop, or a busy one, can be the bottleneck rather than the connection.
- Other users. Everyone sharing the connection draws from the same pool. A test during a household film night reads lower than one at 7am.
- Distance to the server. Some overhead is unavoidable, which is why a single test is a guide, not a guarantee.
Wired versus wifi, and finding dead spots
The most revealing test is a wired one, plugged straight into the router, because it shows what the line itself can do. Compare that against wifi in the same spot and you learn how much your wireless setup is costing you. Then test in different rooms: where the number falls off a cliff is where a dead spot lives, and that tells you where to put a router or a mesh point.
If the speed you measure on a wired connection is far below your plan, and stays low across several runs, that is the figure worth raising with your provider.
After the connection, a webcam test and microphone test confirm the rest of what a video call needs.