Xfinity (Comcast) speed test
Free Xfinity speed test. Find out what % of your Xfinity / Comcast plan you're actually getting. NetStartr compares your live result against the speed you pay for.
Typical Xfinity (Comcast) delivery
~78% of advertised speed
DOCSIS 3.1 cable. Upload speeds are notoriously low compared to download — a common complaint for video creators and remote workers.
Xfinity (Comcast) plans & advertised speeds
| Plan | Down (Mbps) | Up (Mbps) |
|---|---|---|
| Connect | 75 | 10 |
| Connect More | 200 | 10 |
| Fast | 400 | 10 |
| Superfast | 800 | 20 |
| Gigabit | 1000 | 35 |
ISPs advertise “up to” speeds. Your real-world result depends on line type, congestion, modem and Wi-Fi. Use NetStartr to find out what fraction you\'re getting.
How to test your Xfinity (Comcast) connection accurately
- Plug a laptop or desktop into your router with Ethernet (avoid Wi-Fi for the headline number).
- Pause cloud syncs and downloads.
- Open NetStartr and click Start Test.
- Pick your Xfinity (Comcast) plan from the “Am I getting what I pay for?” selector and read off the percentage.
- Re-test at peak (8-10 PM) and off-peak (8 AM) to spot congestion.
What to do if Xfinity (Comcast) underdelivers
- Reboot your modem & router; many ISP modems re-provision on boot.
- If you\'re under 70% of plan three days running, contact support and reference the times you tested.
- Ask for a free modem swap (cable plans) or a tech visit.
- If unresolved after a few weeks, request a partial bill credit.