[portman]

You have definitely been undercharging.

$75/hr is the low end, and $200/hr is the high end.

As one data point: when I ran an independent consulting practice from 2002 - 2006, my prices started at $125/hr and grew to $225/hr.

[StavrosK]

Yep, it looks like it... Prices go down the larger the project is, but I have a tendency to cut them 30% for more than a few hours... Maybe I should keep them high and see what happens, thanks...

Do you mind if I ask what you did, roughly? I mean, what was the object of your work?

[Jd]

That's about my experience, although under a shorter time frame (6 months instead of 4 years).