Test Download Speed

What is FAST.com measuring? FAST.com speed test gives you an estimate of your current Internet speed. You will generally be able to get this speed from leading Internet services, which use globally distributed servers.

Why does FAST.com focus primarily on download speed? Download speed is most relevant for people who are consuming content on the Internet, and we want FAST.com to be a very simple and fast speed test.

Test Download Speed

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How are the results calculated? To calculate your Internet speed, FAST.com performs a series of downloads from and uploads to Netflix servers and calculates the maximum speed your Internet connection can provide. More details are in our blog post.

What can I do if I'm not getting the speed I pay for? If results from FAST.com and other internet speed tests (like dslreports.com or speedtest.net) often show less speed than you have paid for, you can ask your ISP about the results.

Download speed measures how fast information can transfer to you. It affects things like how long it takes to download large files, update games, or show pages with lots of photos. Download speed is measured in megabits per second (Mbps). One gigabit is 1000 Mbps, two gigabits is 2000 Mbps.

Upload speed measures how fast information can transfer from you. It affects things like how you appear on video calls, how fast you can upload files to the cloud, and how long it takes to add attachments to emails. Upload speed is measured in megabits per second (Mbps).

Jitter measures the fluctuations in the speeds at which a stream of data is sent. A high jitter score can affect streaming and video calls, making them look and sound choppy or glitchy. Jitter is measured in milliseconds (ms).

1: Plus taxes and fees. Upload/download speed and device streaming claims are based on maximum wired speeds. Actual internet, Wi-Fi speeds, and Wi-Fi coverage are not guaranteed and can vary based on factors such as home or business size and layout, construction materials, hardware and software limitations, latency, packet loss, etc. See what affects internet speeds.

Use the Internet speed test to see how your current Internet or WiFi connection measures up. Results may vary based on device capabilities, number of connected devices and router placement. If your WiFi speed is lower than expected, try moving closer to your router or checking your internet speed with another device.

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There are a handful of factors that could impact or slow down your download and upload speeds:

If your computer is older or out of date, it may affect your transfer rate. Try checking to see if your computer requires updating.

Check your wireless connection. Walls, radios, or increased distance from your router might be causing WiFi interference. Try getting closer to your router or plugging it in directly.

For further support troubleshooting your Internet connection, click here.

Slow internet speed could be caused by an outdated router or a router placed too far away from your TV or computer. However, if your internet speed is slower than you would like, you can consider a faster speed option, such as Spectrum Internet Ultra or Spectrum Internet Gig.

Good coverage means your device is getting a strong WiFi signal. That strong signal will also deliver as much speed as your device can handle. As you move away from your router, signal strength diminishes, slowing upload/download speeds and reducing coverage. The placement of your router is key to ensuring both coverage and speed for your devices.

An internet speed test measures the connection speed and quality of your connected device to the internet. It does so by running multiple consecutive tests that analyze different aspects of your internet connection, namely ping (latency), download speed, and upload speed. Each of these values represents the connection's specific qualities, which you can read more about in the paragraph after the next. These should help you understand the final speed test results. But before we get to these, we first want to discuss how to perform each test.

To speed test internet performance for downloading data the test is performed by opening multiple connections to a server and simultaneously starting the download of a large data file on all connections. This approach ensures that the entire bandwidth of the internet connection is maxed out, and thereby the maximum data throughput can be measured. Recording the data throughput against measurement time finally yields the available internet speed for downloading data.

Upload speed is tested by reversing the sequence of the download analysis. Again multiple connections are opened to the test server. Instead of downloading a file, a large file of random data is created on your device and pushed through all connections to the server. Pushing the data to the server over the network via multiple streams ensures that the maximum throughput is measured. Again, recording the data throughput against time yields the available internet speed for uploading data.

During the ping test, the device sends a small data package over the network to the test server on the internet. This test doesn't focus on upload speeds but on response time. When the server receives this package, it will send it back to the device, completing the roundtrip. The time it takes the data package to complete the roundtrip is called latency, also known as ping. To achieve an accurate reading, multiple ping tests are conducted consecutively, with the final result being the average of all these tests.

All these are automatically handled for you when you use Speedcheck to test internet speed. But you should take one crucial aspect into account to test speed accurately. Choose the right tool. This depends on the device you want to use, being a phone or tablet, or a computer. To check internet speed on a computer, use your browser and the app on this website. To achieve accurate results on mobile devices, you should download our iOS or Android app, respectively. This is especially important when running a WiFi speed test. Because browsers on mobile devices have poor performance, we suggest using a mobile app written in native code to ensure the most accurate test results.

Download speed determines the transfer rate of how fast data is transferred to your device from the internet. It's calculated by dividing the total throughput of data in a given time frame by its duration. Therefore its unit is denoted by units of data over time. Most often, download speeds are denoted in Megabits per second (Mbps or Mb/s), although other forms like Kilobits per second (Kbps or Kb/s) or Megabyte per second (MBps or MB/s) are also common.

Upload speeds as opposed to download speeds characterize the amount of data your device can send to the internet. It's calculated the same way and is therefore denoted in the same units. Upload speed is very important for online gaming and video calls, where you need as much speed as possible.

I can test my internet speed to learn about my connection speeds. This enables me to a) ensure that I'm getting what I'm paying for from my internet service provider and b) helps me adapt my expectations about what type of applications I can run like online games or video calls without issues on my network.

It's important to understand that different internet speeds are necessary for different usage scenarios. Both download and upload speeds determine what's possible. So when you test internet speed, keep in mind that the question "How fast is my internet?" can only be answered in relation to what you want to use the connection for. While simply browsing the web can be achieved with low single-digit megabit per second speeds, streaming Netflix in 4K resolution will need a maximum speed of at least a 25Mbps connection speed. Online gaming will primarily be influenced by your ping, with a smaller ping being better while publishing content on the web, like uploading large videos to Youtube will be primarily constrained by your upload bandwidth. To download files especially large files at a good speed you should aim for a download speed with a transfer rate of at least 10Mbps.

The device speed test checks the speed between your smartphone, tablet, computer, or other device and the internet. You can run the test through a cellular (mobile) network, a wired broadband connection, or your home Wi-Fi.

A gateway speed test checks the speed between your AT&T Wi-Fi gateway and our network. It reflects the speed coming into your home.

Your device speed varies, depending on the number of devices you connect to Wi-Fi, how you use them, their age and type, and Wi-Fi signal strength.

See what speeds you can expect from your devices

Check the speed and performance of your connected devices with the speed test provided by Ookla. A device speed test checks the speed between your smartphone, tablet, computer, or other device and the internet. You can run the test through a cellular (mobile) network, a wired broadband connection, or your home Wi-Fi.

Find the internet download and upload speeds for each of your devices. Device speeds vary, depending on how many devices you connect to Wi-Fi, how you use them, their age and type, and Wi-Fi signal strength.

See what speeds you can expect from your devices

A "packet" of information is sent from your device to the server and back. The amount of time it takes for that information to make the trip is your ping. Next, the speed test downloads and uploads a packet of data over that connection. How quickly your internet can transfer that data from the network to your device and from your device back to the network determines your download and upload speed. e24fc04721