After helping millions of people run speed tests, we've collected the questions we hear most often. If you're new to measuring your internet, start here — most answers take less than a minute to read.
Basics
What does a speed test measure?
A speed test measures three things: ping (latency in milliseconds), download speed (Mbps), and upload speed (Mbps). Ping is how long a data packet takes to make a round trip; download and upload are how fast data moves in each direction. Our What Is Internet Speed? guide covers the fundamentals.
What is a good ping?
Under 30 ms is excellent for gaming and video calls. 30–60 ms is fine for most browsing and streaming. Above 100 ms, you'll notice lag in fast-paced games and slight delays on calls. Learn more in our ping and latency guide.
What is Mbps?
Megabits per second — the standard unit for internet speed. One megabit is roughly one-eighth of a megabyte, so a 100 Mbps connection downloads about 12.5 MB of data per second. Our Mbps explained article has the full breakdown.
Accuracy
Is a speed test accurate?
A speed test is accurate about your connection at that moment. It can't tell you your plan's "true" speed — no single test can. Real-world speed depends on the test server, time of day, network congestion, and your own equipment. Run several tests at different times and look at the trend, not one number.
Why is my Wi-Fi speed lower than my wired speed?
Wi-Fi is slower and less stable than a wired connection by nature. Walls, distance, neighboring networks, and older routers all cut into wireless throughput. If wired speeds look great but Wi-Fi doesn't, the fix is usually router placement or an upgrade to a newer standard.
Do background apps affect the result?
Yes — a lot. Streaming, game updates, cloud backups, and even video call software running in a browser tab all consume bandwidth. Close what you can before testing. For a clean baseline, run the test on a wired connection with everything else paused.
Why do results differ between tests and websites?
Different tools use different servers, connection counts, and measurement periods. Ookla, Fast.com, and SpeedCheckTest can all show different numbers for the same connection — and all can be "correct." That's why we recommend averaging results across a few runs on the same tool. See our Ookla vs Fast.com comparison for details.
Understanding the Numbers
How much speed do I actually need?
For one person: 25–50 Mbps handles HD streaming and video calls comfortably. For a household streaming 4K, gaming, and working from home at once, 200–500 Mbps is a reasonable target. The exact answer depends on what you do and how many devices share the connection. The FCC's Broadband Speed Guide is a good official reference, and our good internet speed guide goes deeper.
Is my download speed the whole story?
No. Upload speed matters for video calls, streaming to viewers, cloud backups, and large file sends. Many cable plans advertise big downloads but small uploads — check both numbers before judging your connection.
What's the difference between ping and jitter?
Ping is average round-trip latency; jitter is how much that latency varies from packet to packet. High jitter causes choppy video calls even when ping looks fine. If your connection drops packets or jitters badly, see our packet loss guide.
Testing the Right Way
Should I test on my phone?
You can, but mobile results are heavily affected by Wi-Fi distance and, on cellular, by your carrier's network. For a plan-vs-reality check, test on a wired computer. For a quick health check of your Wi-Fi from the couch, a phone test is fine. See our mobile speed test guide.
How many times should I test?
At least three, spread over different times of day — morning, afternoon, and evening. Average the results. If every reading is consistently far below your plan, there's likely a real problem worth investigating.
What should I do with the results?
Compare them to your plan's advertised speed. Consistently seeing under ~50% of what you pay for is a legitimate reason to contact your ISP. Keep screenshots of your results — they're evidence if you need to escalate. The FCC offers a formal complaint process if your provider won't resolve it.
Privacy
Does a speed test see my personal data?
SpeedCheckTest doesn't ask for your name, email, or account. Test history is stored only in your browser's local storage and is never sent to our servers. We do use IP information to route your test to the closest server and to display your ISP. Full details are in our privacy policy.
More Help
This FAQ covers the essentials, but every connection is different. For step-by-step fixes, browse the troubleshooting guides. To run a fresh reading right now, start a speed test.