A free web page hosting company provides hosting accounts that offer a certain amount of disk space that you can use to store all your files. Exactly what is, and isn't counted towards your disk space usage will differ from host to host; so make sure you check precisely what files you will need to allow for when deciding how much disk quota you will need.
It would be a good idea to have some kind of estimates on what you need for a variety of tasks. Like the space will you need for your emails, web files, databases and log files? By determining down your usage like this it will be much easier to work out how much space you require.
All plans will surely include all your web accessible files when calculating disk usage. Some hosts will also choose to include email and/or logs in the quota, which can make estimating your disk space necessities more difficult. While you may have a good idea of the disk space needed for your web files, your email and log file needs change continuously.
Should a host contain all types of file storage in the quota, check to see if you can toggle off your logs or keep out particular information? If the option is available it will save you a lot of disk space, mainly if you have a busy site. However, if you want to use any statistics package that is available with your hosting, you will need to allow some logging to take place.
If your email settings and inboxes are included in your disk quota, it might be a thought to set the maximum size of each mailbox if it is doable. This will save you from storing too much mail on the server and unintentionally going over your limit.