This might be of help:
http://www.sheldonbrown.com/chainline.html
scroll down to the tables.
If you know what hub you have you just add the hubs "chainline center to shoulder", with the freewheels "chainline from shoulder".
Myself I have an IRO hub 36mm + shimano 1/8" freewheel 8.67mm= which gives me a chainline of 44.67. Almsot spot on for my Sugino RD.
If this doesn't add up to reality for you, something might be incorrectly installed.