Believe it or not in all of my career as a developer, I’ve never had to take a Photoshop character tracking value and convert it to a letter-spacing value in CSS until recently.
My first instinct is to usually Google my problems instead of sorting them out for myself (because, why reinvent the wheel), but this time I worked it out for myself and then Googled.
The formula is:
Photoshop value / 1000 = em value
So in my case the Photoshop value was 75 which gave me letter-spacing: 0.075em
Oh, and after cleverly working this out for myself, I Googled and realised lots of people have already worked this out. Still, I felt as though I should publish it if anyone ever came across my blog as well.