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Investing calculators

Plan your monthly investing with clear math: every calculator shows how the numbers are worked out. Free, no sign-up.

  • Compound interest calculator with monthly contributionsWhat your money becomes with monthly contributions: final balance, interest and year-by-year growth.Open calculator
  • Average cost per share calculatorYour average cost per share across buys and sells, fees included, and your gains or losses.Open calculator
  • How much to invest each month to reach a goalHow much to invest each month to reach your goal, with the math for several time horizons.Open calculator
  • FIRE calculator: the 4% ruleThe nest egg to live off your investments (4% rule) and how long it takes to get there.Open calculator

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