Investment Return Calculator
See how a lump sum plus steady contributions could grow — and how the return rate changes the outcome.
How to use
- Enter the lump sum you are starting with.
- Enter the amount you plan to add every month.
- Enter an expected annual return for your investment mix.
- Enter the number of years you plan to stay invested, then press Calculate.
Run the same plan at a lower return and a higher return to see the range of outcomes — this is your return scenario check. A plan that only works at an optimistic return is fragile; a plan that works even at a modest return is sturdier. Remember that real returns vary year to year, and this calculator smooths them into one steady rate.
Worked example
Initial investment: $5,000. Monthly contribution: $300. Annual return: 8%. Period: 20 years.
Result: future value $200,010.91, total invested $77,000, earnings $123,010.91. Total invested is the $5,000 starting amount plus $300 a month for 240 months. Earnings are the future value minus total invested. At a lower 5% return, the same plan would reach roughly $137,000 — a useful reminder that the return assumption drives the result.
Frequently Asked Questions
How is this different from a compound interest calculator?
This tool is framed around investing: a starting lump sum plus regular contributions, with return scenarios for different market outcomes. A generic compound interest calculator usually covers a single deposit growing at a fixed rate, without the contribution plan.
What return should I use for stocks versus bonds?
Historically, diversified stocks have averaged higher returns with bigger swings, while bonds have averaged lower returns with smaller swings. Your mix should match your time horizon and tolerance for drops — use a blended rate that reflects your actual mix.
Does this account for fees and taxes?
No. Fund fees, advisory fees, and taxes on dividends or gains all reduce real returns. If your fund charges 0.5% a year, try lowering the return input by about that amount to approximate the effect.
Why does the result grow faster in later years?
Compounding: returns earn returns. Early on, most growth comes from your contributions; later, earnings on the accumulated balance do most of the work. That is why staying invested through market dips matters.
Is the projected value guaranteed?
No. Markets fluctuate, and a single steady return is a simplification. Treat the result as a scenario for planning, not a forecast, and revisit the plan when your situation or the market changes.
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