A speed test throws four numbers at you: download, upload, ping, and jitter. Each answers a different question about your connection. Here is what they mean and how much of each you actually need.
Download and upload speed
Download speed is how fast data comes to you, which covers streaming, browsing, and loading pages. Upload speed is how fast data leaves you, which matters for video calls, posting files, and cloud backups. Most home connections are asymmetric, meaning download is much faster than upload. Both are measured in megabits per second (Mbps).
Mbps is not MB/s
This trips up almost everyone. Internet speed is measured in megabits per second (Mbps), but file sizes are in megabytes (MB). There are 8 bits in a byte, so to get the download speed you feel when saving a file, divide the Mbps figure by 8:
- 100 Mbps = 12.5 MB/s
- 500 Mbps = 62.5 MB/s
- 1,000 Mbps (1 Gbps) = 125 MB/s
So a 100 Mbps connection downloads a 1 GB file in roughly 80 seconds at best, not 10. This is why our internet speed test shows both Mbps and MB/s side by side.
Ping (latency)
Ping, also called latency, is the round-trip time for a small packet to reach a server and come back, measured in milliseconds. It is about responsiveness, not volume. Low ping is what makes a connection feel instant. For gaming and video calls it matters more than raw speed: under about 30 ms is excellent, under 60 ms is fine, and above 100 ms starts to feel laggy.
Jitter
Jitter is how much your ping varies from one moment to the next. A steady 20 ms is far better than a ping that bounces between 10 and 90 ms, even if the average is similar. High jitter is what causes a video call to stutter or a game to feel unpredictable despite a decent average ping. Under about 30 ms of jitter is generally smooth.
How much speed do you actually need?
- One person browsing and HD streaming: 25 to 50 Mbps is plenty.
- A household with 4K streaming and several devices: 100 to 300 Mbps.
- Heavy uploaders, large households, frequent big transfers: 500 Mbps or more.
Beyond a point, more download speed stops making a noticeable difference to everyday use, and low ping and jitter matter more than a bigger headline number. If your speeds are far below what you pay for, test with a wired connection to rule out Wi-Fi, and test at different times of day.
Run the internet speed test to see all four numbers for your own connection, with a live chart of throughput as it measures.