Most of the online places I've used, will give you the actuall number up to 1500. Above 1500 comes back as > 1500.
These are fine for pct, pre cycle, and you can use them to test your gear. I basically will use 125mg a week for a few weeks, then have a blood draw, then I will increase to the dose I want to run. I try to do this everytime I use a new brand.
Keep in mind many things can change what the number will be, but you can find a basic range that you should bs in from 125mg.