How does PhD candidate salary compares between differen European countries, and the USA? I would like to know which is the salary average of a PhD candidate position in chemistry in different countries of Europe or in USA.

I know that in Germany and France the salaries are around 1300€ after tax and in Spain, Italy and Portugal around 900€ (correct me if I´m wrong).
it depends on your contract.

In Germany you have a contract as TVL 13.

Fulltime netto: 2200-2400 Euro