Use an index fund calculator to understand how passive investments may grow over time based on duration, contributions and market-linked returns.

What Is an Index Fund? An index fund is a type of investment fund with a portfolio built to track or match financial market index components, such as the Standard & Poor's 500 Index (S&P 500).

Young people looking for investing guidance often find themselves receiving some version of the same advice: just buy index funds. And on its face, this is a pretty ...