It is very important to know how much bandwidth your account use and so here is a tutorial that will guide you on how to limit your bandwidth usage in WHM:
1. This is a tutorial about how to limit bandwidth usage in WHM or Web Host Manager.
2. First, you should log in to Web Host Manager (WHM). This demo assumes that you’ve already logged in. Now you’ll learn about the bandwidth limits for specific accounts in your Web Host Manager or WHM. In the left panel, you’ll see a link “Limit Bandwidth Usage”; click it.
3. You’ll see another page about limit bandwidth usage. It is important to know that a hosting account’s bandwidth limit cannot be exceeded. When the limit of the bandwidth is reached, the account will stop working until either of these two situations happen:
 : : : : :a.) The end of the month wherein the bandwidth usage are reset, or
 : : : : :b.) The bandwidth limit is increased.
Once you have created an account in Web Host Manager you already have an automatic bandwidth limit. To see the bandwidth limit of one of the listed accounts select and click “demo123.com”.
4. Scroll down
5. Click the limit button.
6. A new screen will show the bandwidth used by user demo123; it says that it used 0 Meg or megabytes of bandwidth and has a bandwidth limit of 20000 megabytes.
Let’s try to change the bandwidth limit by typing in a new value in the bandwidth limit text box.
7. After changing the value click the Change button.
8. That’s it; you have already changed the bandwidth limit for the account demo123. Now on the left panel, click the “View Bandwidth Usage” link.
9. A new screen will appear with the summary of all the users and their corresponding used bandwidth. Click the “show units in megabytes” button to show the bandwidth in megabytes instead of gigabytes.
10. Now as you can see in the summary, the columns for the bandwidth are now in megabytes
11. Click the Home link at the top of the screen.
12. This is the end of the tutorial about how to limit the bandwidth usage in WHM.