Calkoo – All Calculators
http://www.calkoo.com/

On this site you will find superb calculators for practically any purpose. Whether you are preparing a business plan for your start-up company and need to calculate the NPV for an investment, or if you play free roulette and want to invest your possible winnings in stock market, or perhaps you’re trying to compare fuel efficiency of several cars you are considering buying – they have everything you need right here! This has been added to the tools section of Research Resources Subject Tracer™ Information Blog.