SR Profit Calc

Tired of constantly doing conversions while shopping on Silk Road and similar sites, I coded this calculator.
It allows for the projection of profit vs selling price and buying price, both in dollars and in bitcoins.
Even if you are not selling what you buy, this application provide prices per miligram, per gram, and per dose.

I've left the Visual Basic source code up, and please comment on any changes or additions you would like to see!