https://hoos.coffee/blog/why-take-weight-loss-percentage
<11 % Weight Loss:
When the coffee loses less than 11% weight loss, I am generally concerned that it is under-roasted / under-developed. Some lower moisture content coffees (green) can be in the 10’s, but I am generally skeptical of a roast when I am less than 11%.
11 - 13 % Weight Loss:
This is, almost without exception, light roast territory. Generally, unless the coffee is quite wet, as you move above 13% you end up with what I would consider a light-medium or medium roast.
14 - 16 % Weight Loss:
For me, this is medium roast territory. Here we tend to have less acidity and delicate notes and have more caramels, nuts, and chocolate.