Run a speed test directly in your web browser

The fastest way to check your internet speed is to visit a speed test website in any browser — no software to read or install. Open speedtest.net, fast.com, or speedtest.cn (all free), and the site will automatically measure how fast data moves to and from your computer. The test takes 30 seconds to two minutes and shows three numbers: read speed (how fast you receive data), upload speed (how fast you send data), and ping (how long it takes for a signal to reach a server and come back).

Each site works the same way. Click the large button to start, then wait while the test runs. You'll see a progress bar and live results as the test measures your connection. When it finishes, write down all three numbers — you'll need them if you contact your internet provider about slow speeds. The results page also shows your IP address and the server location the test used, which can help explain why speeds vary depending on time of day or which server you pick.

Key Takeaways

  • Visit speedtest.net, fast.com, or speedtest.cn in any web browser to measure read speed, upload speed, and ping in under two minutes.
  • Run the test on a wired connection (ethernet cable) for the most accurate result, since Wi-Fi can show slower speeds even when your internet plan is faster.
  • Close other programs and browser tabs before testing, because downloads, video calls, or streaming will lower your measured speed.
  • Compare your results to your internet plan's advertised speeds — most providers may provide 80 to 90 percent of the advertised read speed.
  • Slow speeds on Wi-Fi but normal speeds on ethernet usually mean your router placement or signal strength is the problem, not your internet service.

Test on a wired connection for accurate results

Wi-Fi is convenient but slower than a direct ethernet cable connection, so your speed test result depends heavily on how you connect. If you test over Wi-Fi and get speeds much lower than your plan promises, plug an ethernet cable directly from your router to your computer and test again. If the wired speed matches your plan but Wi-Fi is slow, the problem is your router's location, signal strength, or interference — not your internet service itself.

Most people test over Wi-Fi because it's easier, and that's fine for a rough check. But if you're troubleshooting slow internet or calling your provider to complain about speeds, always test on ethernet first. This tells you whether the problem is your internet connection or your wireless setup. Keep the ethernet cable reasonably short (under 100 feet) and avoid running it next to power cables, which can interfere with the signal.

Close other programs before you test

Your speed test measures what's actually happening on your connection right now. If someone else in your house is streaming video, downloading files, or on a video call, the test will show lower speeds because the bandwidth is being shared. Close all browser tabs except the speed test, quit any programs that use the internet (video players, cloud backup, game launchers), and ask others on your network to pause their activity for a few minutes.

Even background programs can affect results. Windows Update, antivirus scans, and cloud storage services like OneDrive or Google Drive sometimes sync in the background without you noticing. Check your taskbar for any programs you don't recognize, and close them before testing. The more isolated your test is, the more accurately it reflects your actual internet speed.

Understand what your results mean

read speed is what matters most for everyday use — it's how fast you can load websites, stream video, or read files. Most internet plans advertise this number. Upload speed matters if you video call, stream to Twitch, or upload large files to cloud storage. Ping (measured in milliseconds) is the delay between your computer and the server; anything under 50 ms is good for web browsing and gaming, and under 100 ms is acceptable.

Compare your test results to your internet plan's advertised speeds. Internet providers are required to deliver at least 80 percent of advertised read speed under FCC rules, so if your plan says 100 Mbps, you should see at least 80 Mbps on a wired test. If you're consistently getting less than that, contact your provider with your test results. If you're getting close to your advertised speed, your internet service is working as promised — any slowness you feel is likely caused by your device, Wi-Fi signal, or the website or service you're using.

Run multiple tests at different times

Internet speed varies throughout the day. Test in the morning, afternoon, and evening to see if your speeds are consistent or if they drop during peak hours (usually 7 p.m. to 11 p.m.). If speeds are normal in the morning but slow at night, your provider's network is congested, and there's little you can do except contact them or switch providers. If speeds are always slow, the problem is likely your router, your Wi-Fi signal, or your internet plan itself.

Also test from different locations in your house if you're on Wi-Fi. Speed near the router will be faster than speed in a bedroom far away. This helps you understand whether your Wi-Fi coverage is the issue. If you need faster speeds in distant rooms, you might need a mesh Wi-Fi system or a Wi-Fi extender, which are separate from your internet speed — they just help your existing internet reach farther.

Interpret slow speeds on Wi-Fi versus ethernet

If your ethernet test shows normal speeds but Wi-Fi is slow, your router is the bottleneck, not your internet service. This happens when your router is old, too far away, blocked by walls, or in a location with interference from microwaves or cordless phones. Move your router to a central, elevated location (not on the floor or in a closet), away from other electronics. If that doesn't help, your router may need replacing — routers older than five years often can't deliver modern internet speeds even if your plan is fast.

If both ethernet and Wi-Fi are slow, and you're getting less than 80 percent of your advertised speed, contact your internet provider. Provide them with your test results from speedtest.net, the date and time you tested, and whether you tested on ethernet or Wi-Fi. They can check your line for problems and may send a technician if there's an issue on their end.

Frequently Asked Questions

Why does my speed test show different results each time I run it?

Speed varies slightly because of network congestion, which server the test uses, and what else is happening on your connection. Run the test three times and average the results for a more reliable picture. If results vary wildly (like 50 Mbps one time and 10 Mbps the next), something is interfering with your connection — close other programs, move closer to your router, or test on ethernet.

Is fast.com better than speedtest.net?

Both are accurate and free. Fast.com is made by Netflix and focuses on read speed only, which is what matters most for streaming. Speedtest.net shows read, upload, and ping, so it's more detailed. Use whichever you prefer — the results will be similar.

What upload speed do I need?

For web browsing and streaming video, upload speed barely matters — even 1 Mbps is fine. For video calls, you want at least 2.5 Mbps. For streaming to Twitch or uploading large files regularly, aim for 5 Mbps or higher. Most home internet plans have much lower upload speeds than read speeds, which is normal.

Can I check my speed on my phone instead of my computer?

Yes, the same speed test websites work on phones. Keep in mind that phone speeds may differ from computer speeds because of Wi-Fi signal strength or the phone's antenna. For the most reliable test of your internet service, use a computer on ethernet.

My speed test shows good numbers but websites still load slowly. What's wrong?

Your internet connection speed and website loading speed are different things. A slow website might be hosted far away, overloaded, or have poor performance on its own. Try testing a different website. If all websites are slow but your speed test is normal, the problem is likely your router, your device, or your browser — not your internet service.