Practical guidance
Stop background downloads and use a wired connection where possible. Repeat tests at different times and record the chosen endpoint. Megabits per second and megabytes per second are different units.
Before using this tool
Define what you need from Internet speed test and prepare the relevant input. When diagnosing a live service, record the test time and connection conditions so you can compare results after configuration changes. Check findings against the documentation for your software.
Tool availability
This is currently an information page. No working form, calculations or submission to diagnostic services is available yet. The interface and supported input formats will be documented when functionality is released.