A mutual fund return calculator is a useful financial tool that allows an investor to calculate the returns obtained from mutual fund investments. It is determined by a variety of factors such as a portfolio of fixed income, maturity of the scheme, fixed income securities maturing, income tax, and so on. A systematic investment plan (SIP) is when a person invests a small amount each month in a specific scheme, and a sip calculator can help to calculate the returns on mutual fund investments.