How to test your internet speed properly (and read the results)

A speed test gives you a number, but the number only means something if the test was fair. A few simple habits make the difference between a useful result and a misleading one.

What the numbers mean

Download: how fast data reaches you. Matters for streaming, browsing and downloads.
Upload: how fast you send data. Matters for video calls, cloud backups and posting videos.
Latency (ping): the delay for a message to travel and come back, in milliseconds. Matters for gaming and calls. Under 30 ms is excellent, and under 100 ms is fine for most things.
Jitter: how much latency varies. High jitter makes calls choppy even when speed is high.

How to get a fair test

Use a cable if you can. Wi-Fi adds variation that hides what your line can really do.
If testing Wi-Fi, stand near the router first, then repeat in the room where you have problems.
Pause downloads, updates, backups and streaming on all devices.
Turn off any VPN for the test, then optionally test with it on.
Run it three times and note the range, not just one result.
Test at different times, including your busy evening hours.

Why results differ between test sites

Each test measures against a particular server. A nearby server gives higher numbers than a far one. Browsers and older devices can also limit the speed they can measure. Use one tool consistently and compare like with like. Our internet speed test measures from your own browser, so it shows what you can really get.

What speed do you actually need?

Browsing and email: 5 to 10 Mbps.
HD streaming per screen: 5 to 8 Mbps.
Video calls: 3 to 8 Mbps both ways.
Online gaming: speed matters less than low latency, under 50 ms is ideal.
A busy household: add the needs of everyone using the network at once.

A worked example

A plan promises 300 Mbps. A Wi-Fi test in the bedroom shows 40 Mbps, but a wired test next to the router shows 285 Mbps. The line delivers; the Wi-Fi does not. Moving the router, switching to the 5 GHz band, or adding a mesh unit will help more than a faster plan.

When the result is poor

If a wired test is well below the plan at several times of day, note the results and contact your provider. If speed is fine but things still feel slow, the problem may be the site you are using, not your line. Check it with the checker, and see why is my internet slow.

Check a website now

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Last updated 2 November 2026. Written by the siteupdown.com team. Spotted a mistake?

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