An Explanation Of Bandwidth: What It Means And How Much You Need

When planning a website and choosing a web hosting service, you have to predict and allocate the amount of bandwidth you’ll need, and this is often unknown for a new website. What is “bandwidth”? How much bandwidth do you need? Even if you’re a seasoned website owner, when it comes to understanding bandwidth offers from hosting companies, it is easy to become overwhelmed. Certain truths are inevitable when it comes to bandwidth:

  1. You need to find the right bandwidth option for your needs.
  2. Failure to do so will result in an underperforming website, additional charges, or both.

Reassuring Note: Before we begin, if you have a small business with a limited audience of 5,000 or fewer visitors per month, you probably don’t have to worry too much about bandwidth. Most major hosting companies like Pantheon, BlueHost, HostGator, GoDaddy, etc., can provide all the bandwidth you need within their cheapest hosting account – although we never recommend the “cheapest” account. Businesses that have “bandwidth-heavy” content such as video, audio, online apps, large images, and businesses that have a lot of traffic are the ones that should really be concerned – read on.

Also see our new video on bandwidth.

What is Bandwidth?

In its most basic definition, bandwidth describes the level of traffic, and amount of data that can transfer between your site, users, and the Internet. Web hosting companies offer a maximum level of bandwidth for their tiers of hosting packages. Seeing these tiers clearly defined, when viewing a hosting website, is often a good indication of which hosting companies have the best-in-class of three essential components:

  • Networks
  • Connections
  • and Systems

Usually, the more bandwidth a web host can provide, the faster and the better these three factors will be.  At the same time, you should try to avoid attractive-looking “unlimited bandwidth” offers, as these are often not what they seem (more on this point later). “Unmetered bandwidth” should be more along the lines of what you are looking for.

examples of bandwith

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The Basics of Network Connectivity

You probably already know that the Internet consists of millions of computers around the world that are connected by networks. The bigger the connection, the faster the network, and the more bandwidth that is available for a site. If you are familiar with your home Internet connection, you have probably encountered bandwidth in terms of your connection speed. After all, speed is a lot easier for the layperson to understand than a technical-sounding term such as bandwidth.

Bandwidth at Home

Ten years ago, you might have used a frustratingly slow DSL connection with a speed of 1.5 megabits (MB) per second. Replace the word “speed” with “bandwidth” and it will become clear. Your allowed maximum “bandwidth” was a mere 1.5 megs per second for the transfer of data between the network and your computer.

The Advent of Broadband

The problem of dreadfully slow DSL connections gave rise to what is known as “broadband,” i.e., the capacity to transfer large amounts of data quickly over a copper cable connection. Fiber optic cable is now replacing copper cable, setting a new gold standard in broadband speeds, and moving us from the world of megabit speeds into the world of gigabit speeds (1000 megabits equal 1 gigabit).

Within Web Hosting

how bandwidth works diagram

Getting back to web hosting, you can compare a DSL connection to a shared server. On its own, the connection or server is very powerful; when being shared by dozens or hundreds of people, it slows to a crawl. You can still experience this today in an Internet café or a library; the connection will be noticeably quicker early in the morning when you are the sole user than it will be later in the day when large numbers of users get online and slow the connection down (times of peak usage).

bandwidth for websites

Bandwidth and the Relationship With Web Traffic

Let’s use another analogy to help make bandwidth clearer. In this example, the bandwidth is the number of tables in a restaurant, and the web traffic is the diners. The math is simple: The more tables in the restaurant, the more patrons can dine there at any one time.


Assuring Site Performance Under High Traffic Conditions

Translate this back to the Internet: The higher your bandwidth, the more people can visit your site at the same time and fully enjoy the peak experience you created for them. Remember, however, that it takes a very special restaurant with skilled employees to manage operations when the venue is full to capacity. How your site operates under the stress of high traffic will be crucial to your success. What is the use of high bandwidth if your site cannot cope? You might be able to facilitate 400 visitors a day. What would happen if they all turned up at once?

Understanding traffic patterns is an important consideration when choosing a bandwidth option. Taking the time now to conduct detailed research into your likely visitor demographics will result in a fact-based approach to determining your bandwidth needs. The most likely outcome? You will decide to pay for more bandwidth to assure consistency in your website performance throughout the day for all visitors.

web redesign strategy video


Considering Bandwidth and Web Design

Do not fall prey to the common misconception that downloading data is only associated with popular entertainment sites such as YouTube or iTunes. Almost every action a person takes online involves downloading some amount of data. The bigger and more complicated your web design, the more bandwidth will be used up whenever someone visits your site, even if they don’t get past your homepage. Thankfully, modern web design trends are moving toward simplistic, minimalist designs. This means your own site can present a professionally designed, contemporary look without appearing to be a budget compromise. We would be happy to speak with you about the impact of your website design on bandwidth needs.


math behind website bandwidth

The Big Question: How Much Bandwidth Do You Need?

The answer to this question depends on a variety of factors. Fortunately, we have a formula you can apply that will sort out these factors and help you nail down how much bandwidth you really need to support the traffic on your site. Armed with this information you can evaluate offers from different hosting companies, dismissing those that try to sell you more bandwidth than you need.


by admin
Posted: May 17, 2013

The Bandwidth Formula

As long as you do not offer file downloads from your website, the following formula will tell you how much bandwidth you need: Bandwidth Needed = Daily visitors x Daily page views x Average page size x 31 x Tolerance number The formula gets a little more complicated if your website does contain downloadable content, but is still a reasonably straightforward equation. If your school math is rusty, remember that you have to solve the formulas in the brackets first! (Daily visitors x Daily page views x Average page size) + (Daily file downloads x Average file size) x 31 x Tolerance number

Finding Your Bandwidth Number

We have created the following table that you can reproduce to help you come up with the correct variables in the formula. We have also included example numbers that we will use to revisit the equation at the end.

What it Means
Number (Our Example, Populate this with Your own Numbers)
Daily visitors (average)
The number of daily visitors you expect your site to have.  Calculate an average across the month.  Do not over-complicate it and work it out day-by-day.
Daily page views (average)
Again, calculate an average projection across the month.
 Average page size
 What is the average size of your pages, all things included, in KB.
Daily file downloads (average)
How many times will content be downloaded from your site on a daily basis in terms of additional files independent of your web pages?
Average downloaded file size
How big is the average file you can download from your site?  Err on the side of caution and always go bigger if in doubt.  Measure this in KB, too.
Tolerance number
This is basically your ‘room for error.’  If ‘1’ is your estimate, make this number 1.33, or 1.5, depending on how confident you are in your projections.  If you believe your site may grow quickly, aim for a higher number.

In case you are wondering, the “31” in the formula refers to the maximum number of days in a month.  Most hosting companies calculate bandwidth allowance on a monthly basis, so we take the numbers and multiply them by 31. DO NOT MISCALCULATE: Double check every number you input. If your calculation is too low you may find yourself with only a fraction of the bandwidth you require. If it’s too high you may end up paying unnecessarily for bandwidth you don’t need. Remember, too, that most hosting companies will offer bandwidth based on GB per month, so be sure to convert the number from KB to GB.

The Solution

This is what our hypothetical website would need: (Daily visitors [200] x Daily page views [3.25] x Average page size [60]) + (Daily file downloads [10] x Average downloaded file [850]) x 31 x 2 Simplified, this gives us: 39,000 + 8500 x 31 x 2 The answer is a rather huge-looking 2,945,000 kb, which converts to about 3 GB, the correct bandwidth requirement for this website. If you need assistance completing this formula, please contact us for a free consultation.

Choosing Your Solution

Bear in mind that a number such as the one above represents the bandwidth requirements for a reasonably sized website turning over a good sum of money [generating a good amount of revenue?]. A small business might only require up to 1GB, if that, when the website is first launched. It is also unlikely that when you first get started you will have a lot of content to download. However, this is still a great equation to keep in mind when projecting costs as your business — and traffic levels — grow.

Unlimited Bandwidth versus Unmetered Bandwidth

unlimited-hosting-hoax Now, let’s clear up that point we mentioned earlier: Offers of unlimited bandwidth. Many web-hosting companies will offer unlimited bandwidth as part of their hosting package, a very attractive offer at face value. However, these offers should be checked out very carefully. Unlimited bandwidth could quite easily translate into, “use what you want, but only the first 10GB is free.” Most hosting companies that offer unlimited bandwidth do so knowing that a small business might only use 1GB a month, only to hit clients with additional hidden costs later when bandwidth use increases. Unmetered bandwidth, on the other hand, is a much more transparent offer. The web hosting company is telling you they do not measure your bandwidth usage; you simply pay the agreed rate and use what you need.

Finding a Web Host

Armed with the information presented in this article, you no longer have to be a hostage to bandwidth proclamations and misleading deals from hosting companies. Once you know what your needs are and how to see through industry jargon, you can confidently secure a hosting package with appropriate levels of bandwidth to support your business needs. Check out our video that provides an overview of website bandwidth. About The Author: Robert is a managed VPS hosting consultant who regularly advises businesses of all sizes with regard to their hosting needs, from everything to disk space and bandwidth to additional features that web hosting companies provide.