How to Run an Xfinity Internet Speed Test
To check your Xfinity internet speed, connect your device, pause anything that's downloading, press Start, and wait about 30 seconds. You don't need to sign up or download anything.
Connect your device
For the most accurate result, plug your laptop or computer into your Xfinity Gateway (the box that gives your home internet) with an Ethernet cable. Testing WiFi instead? Just stand in the room you want to check.
Pause everything else
Every device in your home shares the same connection. A TV streaming Netflix or a phone installing an update can make your result look slower than it is. Pause downloads, streams and game updates, and turn off any VPN.
Press "Start Xfinity Speed Test"
The test checks your ping first, then download, then upload. Keep the page open until all three numbers appear.
Read your result, then test again
You'll see your download, upload, ping and jitter, plus a "% of your plan" score. Run the test two or three times and go by the middle result, because one test can catch a brief slowdown.
How to Test Xfinity Speed on Your Phone, Laptop, TV or Game Console
You can run this test on any device with a web browser. Each device has its own limits, though, so the same connection can show different speeds on different devices.
| Device | How to test | What to expect |
|---|---|---|
| iPhone or Android phone | Connect to your home WiFi, open this page in your browser, tap Start | Often 300–800 Mbps at most, even on faster plans |
| Tablet or iPad | Same as a phone | Similar to a phone |
| Laptop or desktop | Use an Ethernet cable for the truest result, or WiFi to test a room | The closest to your full plan speed when wired |
| Smart TV | Open the TV's web browser and visit this page, or test on your phone right next to the TV | Many TVs have slow WiFi or a 100 Mbps network port |
| PS5 / Xbox | Use the console's built-in network test (steps below) | Results differ slightly from browser tests |
On your phone (iPhone or Android)
- Swipe down and check that the WiFi icon shows your home network, not 5G or LTE.
- Open Safari or Chrome and go to InternetSpeedX.
- Tap Start Xfinity Speed Test and keep the screen on until it finishes.
On a PS5
- Go to Settings → Network → Connection Status.
- Select Test Internet Connection.
On an Xbox
- Press the Xbox button and go to Settings → General → Network settings.
- Select Test network speed & statistics.
What Do Your Speed Test Results Mean?
Think of your internet like a water pipe. Download speed is how much water flows into your home, upload speed is how much flows out, and ping is how quickly the water starts running when you turn on the tap.
| Result | What it means | What's good on Xfinity |
|---|---|---|
| Download (Mbps) | How fast things reach you: Netflix, websites, game downloads. Higher is better. | Close to your plan speed, e.g. 270+ Mbps on a 300 Mbps plan |
| Upload (Mbps) | How fast you send things: video calls, photo uploads, cloud backups. Higher is better. | Close to your plan's upload speed (often up to 100 Mbps) |
| Ping (ms) | How quickly your connection reacts. Lower is better, and it matters most for gaming and calls. | Under 30 ms is excellent; under 50 ms is good |
| Jitter (ms) | How steady that reaction time is. Lower is better; high jitter makes calls choppy. | Under 10 ms |
Mbps (megabits per second) works like miles per hour for your internet: it shows how much data moves each second. Ms means milliseconds, or thousandths of a second. 1,000 Mbps is the same as 1 Gig.
Is Your Xfinity Speed Good? Compare It With Your Plan
Your Xfinity speed is good if a wired test shows about 90% or more of your plan's download speed. That's the same mark Xfinity uses in its own app. Over WiFi, 60–80% of your plan is normal.
| Your result vs. your plan | What it means | What to do |
|---|---|---|
| 90% or more (wired) | Everything is working as it should | Nothing. If WiFi still feels slow, see the WiFi check |
| 60–90% | Normal on WiFi, a little low on a wired test | Test again with a cable at a quieter time of day |
| Below 60% (wired) | Something is slowing your connection down | Follow the fixes below |
| Ping above 100 ms | Your connection is slow to react: laggy games, choppy calls | Restart your gateway and use a cable for gaming |
Xfinity Internet Speeds by Plan
Xfinity's main home internet plans offer 300 Mbps, 500 Mbps, 1 Gig and 2 Gig download speeds. Here's roughly what your Xfinity speed test should show on each one:
| Xfinity plan | Max download | Max upload | Good wired result | Normal WiFi result |
|---|---|---|---|---|
| 300 Mbps | 300 Mbps | Up to 100 Mbps | 270–330 Mbps | 180–300 Mbps |
| 500 Mbps | 500 Mbps | Up to 100 Mbps | 450–550 Mbps | 300–450 Mbps |
| 1 Gig | 1,000 Mbps | Up to 100–300 Mbps | 900–1,100 Mbps | 400–800 Mbps |
| 2 Gig | 2,000 Mbps | Up to 250–300 Mbps | 1,800+ Mbps* | 500–1,200 Mbps |
*You'll only see the full 2 Gig speed on a computer with a 2.5 Gbps network port. Speeds vary by area, and some neighborhoods have fiber plans where upload matches download. Plans checked November 2026.
Why is my Xfinity upload speed so much lower than my download? That's normal. Xfinity mostly uses cable internet, which brings data into your home much faster than it sends data out. Upload is only a problem if it's far below what your plan lists.
Not Sure Which Plan You Have?
- Open the Xfinity app (or sign in at xfinity.com) with your Xfinity ID.
- Go to the internet section of your account. Your plan name and speed, such as "500 Mbps", are listed there.
- No app? Check your monthly Xfinity bill, which lists your internet plan under your services.
How Much Internet Speed Do You Actually Need?
Most homes need less speed than they think. Add up what everyone in your home does at the same time:
| Activity | Download needed | Upload needed |
|---|---|---|
| Browsing, email, social media | 5–10 Mbps | 1 Mbps |
| HD streaming (per TV) | 5–8 Mbps | – |
| 4K streaming (per TV) | 15–25 Mbps | – |
| Zoom or Teams video call | 3–4 Mbps | 3–4 Mbps |
| Online gaming | 10–25 Mbps, ping under 50 ms | 3–5 Mbps |
| Uploading big files or live streaming | – | 10–50+ Mbps |
For example, two TVs streaming in 4K, one video call and one gamer use about 80 Mbps together, which a 300 Mbps plan handles easily. If your speed test shows plenty of speed but things still feel slow, the cause is usually your WiFi. Here's how to check.
Slow Result? Find Out If It's Your WiFi or Xfinity
A slow result means the problem is in one of two places: the internet coming into your home (Xfinity's side) or the WiFi carrying it to your device (your side). These three quick tests tell you which, in about five minutes.
Next to the gateway
Stand three to six feet from your Xfinity Gateway, run the Xfinity WiFi speed test on your phone or laptop, and note the download number.
In the slow room
Go to the room where the internet feels slow, such as an upstairs bedroom, and run the test again.
With a cable (if you can)
Plug a laptop into the gateway with an Ethernet cable, turn the laptop's WiFi off, and test once more.
| What you see | What it means | What to do |
|---|---|---|
| Wired is fast, WiFi is slow everywhere | Your WiFi or your device is holding things back | Fix 5 and Fix 7 below |
| Fast near the gateway, slow in far rooms | Your WiFi doesn't reach far enough | Fix 5 below |
| Wired is slow too | The gateway, cables or Xfinity's line has a problem | Fixes 1–4, then contact Xfinity |
Why is WiFi slower than a cable? WiFi travels through the air, and walls, floors and appliances weaken it. Older phones and laptops can't reach high WiFi speeds either. On a 1 Gig plan, many devices top out at 300–600 Mbps over WiFi even when everything is working perfectly.
Wired test stuck at about 94 Mbps? Your laptop's network port or cable probably only supports 100 Mbps. A newer laptop or a Cat6 Ethernet cable solves it.
How to Test Your Speed in the Xfinity App
If you rent an Xfinity Gateway, the Xfinity app can run a "whole home network" test. It checks two things separately: the speed reaching your gateway from Xfinity, and the WiFi connection from the gateway to each of your devices. It's the quickest way to see whether Xfinity is delivering your plan to your door.
- Open the Xfinity app and sign in with your Xfinity ID and password.
- Tap WiFi at the bottom of the screen.
- Tap Troubleshoot.
- Tap Test your whole home network and wait for it to finish.
- Read your results (explained below).
- Speed to gateway is 90% or more of your plan: Xfinity is delivering your speed, so any slowness comes from WiFi or a device.
- Speed to gateway is below 90%: the app suggests restarting your gateway, or offers a replacement if your gateway is too old for your plan.
- Device check: instead of a number, it shows what each device's WiFi can handle, like "HD streaming".
Can't find the test? It isn't available on some older gateways (models DPC3939 and X5001), on modems you bought yourself, or when your gateway is in bridge mode (a setting used with your own router). In that case, use the speed test at the top of this page.
How to Fix Slow Xfinity Internet: 7 Fixes That Work
Slow Xfinity internet usually comes down to one of four things: weak WiFi, a gateway that needs a restart, an outage in your area, or too many devices online at once. Try these fixes in order, and run the Xfinity speed test after each one. For every cause explained in detail, read Why is my Xfinity internet so slow?
Fix 1Check for an Xfinity outage
- Open the Xfinity app and sign in.
- Look for an outage alert near the top of the home screen.
- If there's an outage in your area, nothing at home will help. Wait until Xfinity fixes it, and the app will usually tell you when.
Fix 2Restart your Xfinity Gateway
A restart clears small glitches, just like restarting a frozen phone. It fixes more slow-internet problems than anything else.
In the app (easiest):
- Tap WiFi, then Troubleshoot.
- Tap Restart your Gateway.
- Wait up to 12 minutes. Your internet will be off during the restart.
By hand (no app needed):
- Unplug the power cable from the back of the gateway.
- Wait 60 seconds.
- Plug it back in and wait until the front light stays solid, usually white.
- Run the speed test again.
Fix 3Check your cables
- Find the round coax cable running from the wall to the back of your gateway.
- Tighten it by hand at both ends. Snug is enough.
- If the cable runs through a splitter (a small metal box that turns one cable into two), remove it if you can, since each splitter weakens the signal.
- Swap any bent or old Ethernet cable for a new Cat6 cable.
Fix 4Make sure your equipment can handle your plan
- Run the whole home network test in the Xfinity app (steps above).
- If your gateway is too old for your plan, the app will offer a free replacement.
- If you use your own modem, check the label for "DOCSIS 3.1" and make sure it's on Xfinity's approved device list. Older modems can't reach gig speeds.
Fix 5Get stronger WiFi in every room
- Move the gateway to a central, open spot, such as on a shelf rather than on the floor or inside a cabinet.
- Keep it away from microwaves, cordless phones, metal and thick walls.
- If you see a 5 GHz network, connect to it. It's faster, but it doesn't reach as far.
- In large or two-story homes, add WiFi extender pods or a mesh system.
- Run the Xfinity WiFi speed test in each room to check the difference.
Fix 6Find what's using your internet
- In the Xfinity app, tap WiFi and scroll to your connected devices.
- Pause any device you don't recognize, then change your WiFi password.
- Schedule big downloads, game updates and phone backups for overnight.
Fix 7Rule out your phone or computer
- Restart the device you're testing on.
- Turn off your VPN and any browser extensions you don't need.
- Install any waiting system updates.
- Test on a second device. If only one device is slow, that device is the problem.
Still Slow? How to Contact Xfinity Customer Service
If your wired speed test is still below 60% of your plan after these fixes, it's time to contact Xfinity. The official Xfinity customer service number is:
1-800-XFINITY (1-800-934-6489)
Support is available 24/7. You can also reach Xfinity through the help or chat option in the Xfinity app, which connects you to Xfinity Assistant and then a live agent, or through the support chat after signing in at xfinity.com.
Before you call, have these ready:
- The account holder's name and the phone number or account number on the bill.
- Your plan speed.
- Three speed test results, each with the date, time, and whether you used a cable or WiFi.
- The fixes you've already tried, such as "restarted the gateway, checked cables".
Clear numbers make it easier to get a technician visit or a replacement gateway, without being asked to restart everything again.
Quick Fix Table: Match Your Problem
| Your problem | Most likely cause | Try this |
|---|---|---|
| Slow only in the evening | Lots of people online at once | Test in the morning too; if wired tests stay low, contact Xfinity |
| Slow only on WiFi | Weak signal or distance | Fix 5 |
| Slow in one room only | WiFi doesn't reach that far | Fix 5 (pods or mesh) |
| Slow on one device only | Old device, VPN or pending updates | Fix 7 |
| Wired test stuck around 94 Mbps | Old laptop port or cable | Cat6 cable or a newer laptop |
| Very low upload speed | Normal on cable, or a line issue | Compare with your plan, then Fix 2 and Fix 3 |
| Lag in games or choppy calls | High ping or jitter | Use a cable, then Fix 6 |
| Internet suddenly stopped or crawled | Outage or gateway glitch | Fix 1, then Fix 2 |
Xfinity Speed Test FAQs
Is the Xfinity speed test accurate?
Yes, for the device and connection you test at that moment. For the most reliable result, use an Ethernet cable, test outside busy evening hours, and take the middle of three results.
What is a good Xfinity speed test result?
About 90% or more of your plan's download speed on a wired test. Over WiFi, 60–80% is normal.
Why is my Xfinity speed test lower than my plan?
Usually because of WiFi distance, an older device, other devices using the internet, an outdated gateway or busy evening hours. A wired test shows which one it is.
Is this the official Xfinity speed test?
No. InternetSpeedX is an independent tool. Xfinity's own test measures speed to servers inside Xfinity's network, while ours measures to the nearest internet server. Running both gives you the full picture.
Does this work as a Comcast speed test?
Yes. Xfinity is Comcast's internet brand, so a Comcast speed test and an Xfinity speed test check the same connection.
Is the Xfinity speed test the same as Ookla's Speedtest?
No, they're separate tools that use different servers, so their results are usually close but rarely identical.
Why do different speed tests show different results?
Each tool uses its own servers and method, so a 5–15% difference is normal. To track your speed over time, stick with one tool.
How do I test my Xfinity WiFi speed?
Connect to your home WiFi, stand in the room you want to check, and press Start. Repeat in other rooms to find weak spots.
Can I test my Xfinity speed on my phone?
Yes. Open this page in your phone's browser and tap Start. Make sure the phone is on WiFi, not 5G or LTE.
Why is my Xfinity upload speed so slow?
On cable internet, upload is built to be lower than download. Most Xfinity plans offer up to 100 Mbps upload. It's only a problem if you get far less than your plan lists.
What is a good ping on Xfinity?
Under 30 ms is excellent, and under 50 ms is good for gaming and video calls. Above 100 ms feels laggy.
Will restarting my Xfinity Gateway make my internet faster?
Often, yes. A restart clears small glitches. In the Xfinity app, tap WiFi → Troubleshoot → Restart your Gateway, or unplug the gateway for 60 seconds.
How do I know if there's an Xfinity outage?
Open the Xfinity app. Outage alerts appear near the top of the home screen. During an outage, speed tests will be slow or fail until Xfinity fixes it.
What is the Xfinity customer service number?
The official number is 1-800-XFINITY (1-800-934-6489), and it's available 24/7. Have your speed test results ready when you call.
Do I need an Xfinity Gateway to use this test?
No. This test works with any modem, router or internet provider. Only the Xfinity app's "speed to gateway" test needs a rented Xfinity Gateway.
Does a speed test use my data?
A little. A test on a fast connection can use a few hundred MB. That only matters if you're on mobile data.
How often should I test my internet speed?
Whenever things feel slow, after changing your plan or equipment, and once in the morning and once in the evening if you want to compare.
Is this Xfinity speed test free?
Yes. It's completely free, with no sign-up, app or download.
Conclusion
An Xfinity speed test takes 30 seconds and tells you far more than a guess. Run it, then compare the result with your plan. A wired result of 90% or more means Xfinity is delivering your speed, and any slowness is coming from your WiFi or a device. A low wired result means it's time to restart your gateway, check your cables and, if that doesn't help, contact Xfinity with your numbers. Bookmark this page and test again whenever your internet feels slow.
Test My Xfinity Speed Again ↑
Tino Ropar
Technology Researcher · Reviewed by Marco Elizondo
Computer Science graduate and technology researcher at InternetSpeedX. Tino researches how broadband networks work, how internet performance is measured, and what affects connectivity at home, checking every guide against technical documentation and information from internet providers.
Disclaimer: InternetSpeedX is an independent tool and is not affiliated with, endorsed by or sponsored by Comcast Corporation or Xfinity. Xfinity and Comcast are trademarks of Comcast Corporation. Plan speeds, phone numbers and app steps are provided as general guidance and may change, so always confirm details with your provider.