This is a very simple calculator to use to work out which week your business/project/venture is currently in, so you can put the right number into your weeknote blog post.
It used to to live as a cgi-bin script, but I decided rewriting it in Javascript was easier than setting up cgi-bin on my new server when this website got migrated over.
If you aren't sure what a "weeknote" is, then see our first weeknote entry.