You were about to subscribe web hosting. You went into package comparison and you just not sure what is Bandwidth and what is Data Transfer.
Sometimes you'll find that this hosting does not mention about Data Transfer but Bandwidth, and that hosting does not mention about Bandwidth but Data Transfer, why is that? below is the easiest way for you to understand.
Forget about the technical explanation a while, think of it this way. If Bandwidth were a wide road with more lanes, the wider the road the more cars can pass through it. Data Transfer on the other hand, would then be the number of cars allowed to go through the road in a given time period, say a month.
Some hosting provides unlimited bandwidth, or in other words, yes, do not worry about how wide the road is, because our road is very huge with unlimited lanes. In this case, you'll find only Data Transfer is stated in the package comparison.
The less Bandwidth you have, the slower it takes your website to load, regardless of your visitor's connection type. Visitors will have to wait their turn.
The less Data Transfer you have, the more often you will find your website unavailable because you have reached the maximum amount of data allowed to be transferred. Let say only, 100 cars allowed to pass thru the road in a month. If the first week, 100 cars has passed thru the road, that means you just used all the quotas. For the next 3 weeks your website will load very slow or nothing is loaded.
If you like to go into details about calculating them, you first need to determine what is sufficient for your website to function. You will need to take into consideration the size of your website and the number of visitors you have in a month's time. Your goal is to ensure that all these visitors can view your website without any problem.
1. Number of visitors expected
2. Average page size (including all text, graphics, and other files)
3. Expected page views by each visitor
For example, your website consists of 5 pages, and each of these pages consists of text and images. Say, your average page size is 30KB. You expect 50 visitors per day, and each of these visitors will view all 5 pages on your website.
Your monthly website data transfer would then be:
50 visitors X 30KB X 5 pages X 30 days
= 225,000KB or 0.225GB/month