The availability of a website is measured by the percentage of a year in which the website is publicly accessible and reachable via the Internet. This is different from measuring the uptime of a system. Uptime refers to the system itself being online. Uptime does not take into account being able to reach it as in the event of a network outage.[citation needed] A hosting provider's Service Level Agreement (SLA) may include a certain amount of scheduled downtime per year in order to perform maintenance on the systems. This scheduled downtime is often excluded from the SLA timeframe, and needs to be subtracted from the Total Time when availability is calculated. Depending on the wording of an SLA, if the availability of a system drops below that in the signed SLA, a hosting provider often will provide a partial refund for time lost. How downtime is determined changes from provider to provider, therefore reading the SLA is imperative.[11] Not all providers release uptime statistics.[12] Most hosting providers will guarantee at least 99.9% uptime which will allow for 43m of downtime per month, or 8h 45m of downtime per year.

WordPress is the most popular CMS on the planet and powers nearly 30% of all websites. This widespread use due, in large part, to its usability and zero-dollar cost. But, even though the open-source software is free to use to create a website, you’re going to need a robust hosting solution to power it. Our top-ranked WordPress host, InMotion, offers a number of plans built specifically to run the CMS. And the host’s proprietary site builder, BoldGrid, brings a drag-and-drop functionality to WordPress that simplifies site creation. Bluehost also provides robust hosting support for WordPress. In fact, the host is one of the few providers approved by the Core team. Let’s see how the two hosts fared in this head-to-head battle