Looking at the turbo compressor map for my turbo (FP18G), I noticed that it is measured in m^3/sec and not lbs/min. After looking all over the internet for a calculator and not finding it, I decided to make my own calculator. This is an excel file which allows you to calculate back and forth between lbs/min and m^3/sec. I don't have a degree in mathematics, so the calculations might be slightly inaccurate, however I did my best to make sure that everything was as accuate as I could make it and it seems to be working fine.
Converter
***EDIT*** File has been fixed.