Tools

• Backtest

  Any mix of US stocks, ETFs and mutual funds against a benchmark, with daily prices back to 1962.

• Return calculator

  What a US stock, ETF or mutual fund returned, with dividends reinvested and optional monthly contributions.

• S&P 500 calculator

  A lump sum or monthly investment in the S&P 500 from any month since 1871, before and after inflation.

• Investment calculator

  Growth at a fixed return, or the contribution, rate or years it takes to reach a target.

• FIRE calculator

  How many years of saving it took to retire early, for every start year since 1872.

• Withdrawal calculator

  How often a yearly retirement withdrawal lasted since 1872, and the safe withdrawal rate.

• Compare funds

  Any two US funds or stocks side by side, from the first day both traded.

• Lump sum vs DCA

  How often investing at once beat spreading it over 3 to 24 months, for any portfolio.