How to Use the Internet Speed Test
- Close other downloads, streams and heavy tabs for an accurate result.
- Click 'Start speed test'.
- Wait a few seconds while it measures ping, download, then upload.
- Read your results in Mbps (speed) and milliseconds (ping/jitter).
How the speed test works
This tool measures three things. First, ping: it sends several tiny requests and records how long each round trip takes, then reports the median. Second, download: it streams a large file from Cloudflare's network for a few seconds and calculates your speed from how much data arrived. Third, upload: it sends data the other way and measures how fast it leaves your device.
Speeds are shown in megabits per second (Mbps), the standard unit ISPs advertise. Ping and jitter are shown in milliseconds (ms). Everything runs in your browser against Cloudflare's global edge, so the server is usually close to you for a fair result.
How to get the most accurate result
For the truest reading, test on a wired (Ethernet) connection and pause anything else using the internet, downloads, cloud backups, streaming, and other people's devices. Wi-Fi is convenient but distance from the router, walls, and interference can significantly lower your numbers.
Run the test a couple of times and look at the typical result rather than a single reading, since network speed naturally fluctuates. If you use a VPN, turn it off to measure your real line speed. And remember that your device's own Wi-Fi hardware can be the bottleneck on very fast plans.
Understanding your numbers
Download speed affects how fast pages, videos and files load, it's the number that matters most for everyday use. Upload speed affects video calls, posting content and backing up files to the cloud. Ping is the responsiveness of your connection: under ~50 ms feels snappy, and gamers usually want it as low as possible. Jitter should ideally stay low and steady; high jitter causes stutter in calls and games even when raw speed looks fine.
Tips for a reliable speed test
- Use a wired Ethernet connection for your true line speed; Wi-Fi is usually slower.
- Pause downloads, streaming, backups and other devices before testing.
- Turn off any VPN, which adds overhead and routes through a distant server.
- Run the test 2–3 times and take the typical result, speeds fluctuate.
- Test at different times of day; networks slow down during peak evening hours.
- On mobile data, test sparingly, each run can use 50–200 MB.
Frequently Asked Questions
What is a good internet speed?
For one person browsing and streaming HD, 25 Mbps download is comfortable. For 4K streaming, video calls or multiple people, aim for 100 Mbps or more. Upload matters most for video calls and uploading files, 10 Mbps+ is good for most homes.
What do ping and jitter mean?
Ping (latency) is how long, in milliseconds, it takes data to make a round trip, lower is better, and it matters a lot for gaming and video calls. Jitter is how much that latency varies; low, steady jitter means a smoother connection.
Why is my speed lower than my plan?
Wi-Fi distance and interference, other devices using the connection, VPNs, browser overhead, and the time of day all reduce measured speed. For your true line speed, test over a wired connection with nothing else running.
Does the test use my data?
Yes, a speed test works by transferring real data. A single test can use 50–200 MB on a fast connection, so avoid running it repeatedly on a limited mobile or metered plan.