Understanding an internet speed result
A result is not a property of the subscription alone. It is an observation of a device, software stack, route, server, protocol, and time window.
Sources and implementation reviewed July 10, 2026.
Throughput is measured data divided by time
This site's per-slice throughput formula is bytes × 8 ÷ elapsed seconds ÷ 1,000,000, producing decimal megabits per second. Download counts bytes the browser receives. Upload counts browser-reported bytes sent. WiFiSpeedTest runs multiple streams, groups progress into time slices, trims documented extremes, and averages the remaining slices. Other tests can use different stream counts, protocols, endpoints, and aggregation formulas.
RTT is endpoint-specific
The displayed “ping” is the median elapsed time for successful HTTP requests to this site's edge endpoint. It is not ICMP echo time and does not predict every game's, call's, or website's latency. Each application may use a different route and server.
The displayed “jitter” is the mean absolute difference between consecutive successful HTTP RTT samples. That definition is published so the value can be interpreted correctly; different tools may use another variation statistic.
Failed HTTP samples are not packet loss
A browser fetch can fail because of an HTTP response, browser cancellation, extension, timeout, server behavior, or network problem. This site reports such events as HTTP sample failures. It does not convert them into an end-to-end IP packet-loss percentage.
Loaded RTT change
During the download phase, the site attempts small HTTP timing samples. It subtracts the idle median RTT from the mean successful loaded RTT. The result describes that run and route. WiFiSpeedTest does not present it as a standardized bufferbloat grade.
What can be compared with published figures
| Source | Published figure | Important scope |
|---|---|---|
| Netflix | 3 Mbps for 720p, 5 Mbps for 1080p, 15 Mbps for 4K | Netflix's recommended connection speeds for its service. |
| Zoom web app | 3.8 Mbps down / 3.0 Mbps up for 1080p group video | Zoom lists different figures for different modes. |
| Microsoft Teams | 4 Mbps down / 4 Mbps up for best-performance meeting video | Microsoft also publishes minimum and recommended scenario figures. |
| FCC, March 2024 | 100 Mbps down / 20 Mbps up fixed-broadband benchmark | A U.S. policy benchmark, not an application requirement, national average, or plan guarantee. |
Read results as a controlled experiment
- Keep device, browser, physical location, and connection type fixed.
- Record the tool and endpoint.
- Minimize unrelated traffic.
- Run several samples and compare the median and spread.
- Change one variable, then repeat.