The best way is to check the market directly: do some interviews, get offers, compare. It's a lot of work but chances are that you'll come out of it much better

The best way is to check the market directly: do some interviews, get offers, compare. It's a lot of work but chances are that you'll come out of it much better off. If you think about it, basically nothing you do at your current job will pay off as much spending that effort interviewing. And if you're not willing to change jobs, then your market value is whatever they feel like paying you now.