Internet speed test
Check your connection with the same open NDT7 test the Measurement Lab research platform uses. The test runs directly between your browser and the nearest M-Lab server.
Measured by Measurement Lab, not by usReady when you are
A server will be chosen automatically when the test starts.
What the numbers mean
Download
How fast data reaches you. This is the number broadband is sold on, and the one that governs streaming quality and how quickly pages and files load.
Upload
How fast you can send data out. It matters for video calls, cloud backups and sending large attachments — and on many connections it is far lower than download.
Latency
The round trip time for a single packet. Under 30 ms is excellent and over 150 ms makes conversation awkward. For anything interactive it matters more than raw speed.
Retransmission
The share of data that had to be sent again after being lost in transit. Below 1% is normal; consistently higher points to congestion or a fault worth reporting.
Questions
Who runs the test?
Measurement Lab — an open research consortium that has published internet performance data since 2009. Your browser connects straight to the nearest M-Lab server; this site only serves the page and never sees your traffic.
Is my result made public?
Yes, and you have to agree before the test will start. M-Lab publishes every measurement it collects as an open dataset, which includes your IP address. That openness is what makes the platform independent and free — but if you would rather not contribute a measurement, do not run the test.
Why is my result lower than what I pay for?
A single test measures the whole path between your device and a research server, so Wi-Fi, your router, other people on the connection and the wider internet all count. Test over a cable, with nothing else running, and repeat it a few times before drawing conclusions.
What is latency, and what counts as good?
Latency is the round-trip time for a packet. Under 30 ms is excellent, under 60 ms is fine for video calls and gaming, and over 150 ms makes real-time conversation feel awkward. It matters more than raw speed for anything interactive.
What does retransmission mean?
It is the share of data that had to be sent again because it was lost in transit. Anything under 1% is normal. Consistently higher suggests congestion or a fault worth reporting to your provider.