Alexa’s traffic estimates and ranks are based on the browsing behaviour of people in our global data panel which is a sample of all internet users.
Alexa’s Traffic Ranks are based on the traffic data provided by users in Alexa’s global data panel over a rolling 3 month period. Traffic Ranks are updated daily. A site’s ranking is based on a combined measure of Unique Visitors and Pageviews. Unique Visitors are determined by the number of unique Alexa users who visit a site on a given day. Pageviews are the total number of Alexa user URL requests for a site. However, multiple requests for the same URL on the same day by the same user are counted as a single Pageview. The site with the highest combination of unique visitors and pageviews is ranked #1. Additionally, we employ data normalization to correct for biases that may occur in our data.
If your site’s metrics are Certified you can display Global and Country ranks for your site based on Certified Site Metrics, instead of metrics estimated from our data panel.
Alexa’s Traffic Ranks are for top level domains only (e.g., domain.com). They do not provide separate rankings for subpages within a domain (e.g., http://www.domain.com/subpage.html ) or subdomains (e.g., subdomain.domain.com) unless they are able to automatically identify them as personal home pages or blogs, like those hosted on sites like Blogger (blogspot.com). If a site is identified as a personal home page or blog, it will have its own Traffic Rank, separate from its host domain.
For more information about Alexa’s traffic rankings, you can visit:
There are limits to statistics based on the data available. Sites with relatively low measured traffic will not be accurately ranked by Alexa. We do not receive enough data from our sources to make rankings beyond 100,000 statistically meaningful. (However, on the flip side of that, the closer a site gets to #1, the more reliable its rank.) This means that, for example, the difference in traffic between a site ranked 1,000,000 and a site ranked 2,000,000 has low statistical significance. Sites ranked 100,000+ may be subject to large ranking swings due to the scarcity of data for those sites. It is not unusual for such sites to decline to “No data” Traffic Ranks, or to improve suddenly.
What’s going on with my Alexa Rank?
There are two questions about Alexa traffic rankings that come up quite often:
There are two main reasons why ranks change in ways that might not make sense when you look at them.
First, the Alexa Traffic Rank of a given website isn’t only based on traffic to the given site, but takes into account the traffic to all sites and ranks sites relative to each other. Since your site is ranked relative to other sites, changes in traffic to other sites affect your site’s rank. The second is something called the "long tail".
Every day, Alexa estimates the average daily visitors and pageviews to every site over the past 3 months. The site with the highest combination of visitors and pageviews over the past 3 months is ranked #1. If no one in our measurement panel visited a site over the past 3 months there is no rank at all for that site.
If you plot the number of visitors to a site versus the rank it looks something like this:
At the "head" of the graph is Google.com, which gets a huge number of visitors and is ranked #1. The sites at the head end of the plot, like Google.com, get a huge amount of traffic compared to the sites on the “long tail” at the other end.
The closer you get to the head of the graph, the more visitors it takes to move up in rank. For example, there’s a huge difference in traffic to a site ranked 10 versus a site ranked 200.
However the situation changes as you move out towards the tail. The important thing to notice is that because of the shape of the distribution, a very small change in the number of visitors to a site on the long tail results in a large change in rank.
So, sites ranked in the hundreds of thousands or millions are much more sensitive to small increases or decreases in traffic.