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Welcome to the dedicated Xfinity Speed Test. Comcast Xfinity is one of the largest broadband providers in the United States, delivering DOCSIS 3.1 hybrid-fiber cable and gigabit fiber connections to tens of millions of homes and businesses. Use our diagnostic tool to test your Xfinity download, upload, ping, and jitter to ensure you are getting the bandwidth you pay for.
Xfinity offers tiers ranging from Connect (75 Mbps) and Fast (400 Mbps) to Gigabit Extra (1200 Mbps). While download speeds on Xfinity cable are exceptionally fast, upload speeds are typically asymmetrical (10 to 35 Mbps on DOCSIS 3.1 tiers). When testing on a 1.2 Gbps plan, verify that your modem has a 2.5 Gbps Ethernet port and is connected to a compatible Wi-Fi 6E/7 gateway or multi-gig network card.
The Xfinity xFi Gateway (XB7/XB8) utilizes smart dual-band band steering. If your speed test shows under 100 Mbps on high-tier plans, ensure your device is connected to the 5GHz or 6GHz channel and is not falling back to the 2.4GHz frequency due to physical distance from the router.
If your speeds drop significantly during evening peak hours (7 PM - 11 PM), your neighborhood node may be congested. Restart your xFi gateway via the Xfinity app, check for splitters on your coaxial cable lines, and test with a direct Cat6 Ethernet connection to isolate Wi-Fi issues.
Simply click the 'Start Test' button on this page. The tool will automatically measure your ping, download speed, and upload speed for your Xfinity connection.
Compare your test results with the plan you purchased from Xfinity. If your results are consistently much lower than your advertised plan, try restarting your router, connecting via Ethernet, or contacting Xfinity customer support.