The buying and selling of gemstones, is carried out in carats today. One can convert a carat to ratti with the use of a carat to ratti calculator. All that one needs to know is that .91 carat = 1 ratti. In the tech savvy digital world today, most things can be accessed online. This holds good when it comes to a carat to ratti conversion online too. The carat can be converted to a ratti with the help of a converter that is available online. All that needs to be done is to key in carat to ratti conversion.