How to test your internet speed correctly

Start with a clear question

A speed test measures the connection between your device and a test server at a particular moment. Decide whether you want to check your broadband connection or the Wi-Fi experience in a specific room. These are related questions, but different test setups answer them.

Establish a baseline

For a broadband baseline, connect a capable computer by Ethernet when possible. Pause cloud backups, downloads and streaming on other devices. Keep the same device, browser, server and connection method when comparing results. Note whether a VPN is enabled rather than changing it silently between tests.

Check that the Ethernet port, cable, adapter and router support the speeds you expect. A slower device link can limit the result before your broadband connection does.

Repeat instead of chasing one number

Run several tests with a short break between them. Record the time and connection method. Repeat at a different time of day if the problem is intermittent. Compare the group of results instead of selecting only the fastest one.

Then repeat over Wi-Fi near the router and in the room where you normally work. A difference helps narrow the investigation, but does not identify the cause on its own.

Know the limits

A browser test does not certify your service contract or guarantee the speed of every website. Test-server distance, device performance and current traffic all matter. High-speed tests can transfer substantial data; consider your mobile data allowance before repeating them.

Next, read how to interpret the results or use the transfer time calculator.