This can be very useful http://freelanceswitch.com/rates/ http://freelanceswitch.com/rates/ It'll let you know what you can charge based on your circumstances

This can be very useful http://freelanceswitch.com/rates/ http://freelanceswitch.com/rates/ It'll let you know what you can charge based on your circumstances - consider it a bottom line figure. Markets are such that supply and demand will alter this (if your skills are short supply, like being one of the few developers in the area, it's likely you can charge more)