Speedtest is a widely-used web-based utility operated by Ookla that quantifies your broadband performance in three key metrics: download speed (measured in Mbps), upload speed, and ping (latency in milliseconds). You visit the website, click start, and the tool transfers data packets to nearby servers, calculating how quickly your connection handles real-world traffic patterns.
Why it matters: ISPs advertise headline speeds that rarely match real-world usage. Speedtest gives you independent evidence of what you actually get. This is invaluable when troubleshooting slow internet, comparing ISPs before switching, or checking whether you're receiving the service you're paying for.
Common gotchas:
- Results vary depending on server choice and time of day. Rush hours produce lower speeds.
- WiFi tests give misleading results if you're far from the router or experiencing interference. Test via ethernet cable for your true connection speed.
- Speedtest optimises for peak performance, so results often exceed typical browsing speed.
- The tool uses Ookla's servers, not your actual content sources, so it doesn't measure real-world performance for Netflix, gaming, or work applications.
What to do with the knowledge: Run Speedtest several times across different days and times. If results consistently fall below your ISP's promised speeds by more than 10-20%, contact them for investigation. Compare upload speeds if you work from home or upload files regularly. For gaming or video conferencing, ping matters more than raw speed: aim for under 50ms.
Speedtest also offers a mobile app and desktop software. Ookla publishes aggregated speed data by region, making Speedtest useful for understanding broadband trends beyond your own connection.