It is a tool that allows one to get an idea of the SIP investment returns. These calculators, which can be found in a variety of smartphone applications, aid in experimentation and estimate investment returns. It basically calculates the wealth gain and expected returns for the monthly SIP investment. Therefore, a rough estimate of the maturity amount can be derived from a projected annual return rate. Well Bajaj Finserv also offers SIP Interest Calculator where you can  also invest in SIP as it gives the best SIP interest rate.