Investment Return Calculator
Project your portfolio growth with regular contributions. See the real effect of time, rate, and consistency.
Calculated locally. Share links keep values after #.
These calculators provide estimates for educational purposes only. Results are not guaranteed and should not be treated as financial advice. Always consult a qualified professional before making major financial decisions.
The S&P 500 has returned an average of 10% annually over the last 90 years. But averages hide the order of those returns: a $10,000 investment in 2000 took until 2013 just to break even after the dot-com crash and 2008 financial crisis. The people who won were the ones who kept contributing through the crashes, buying shares at a discount while everyone else panicked.
Read more - how it works, tips & FAQs
How to use this calculator
- Enter your starting investment amount and the monthly contribution you can sustain.
- Choose your expected annual return -- 7% is a realistic long-term average after inflation.
- Set your time horizon and see the full projection with and without contributions.
- Compare scenarios side-by-side: different contribution amounts, rates, or start dates.
How to calculate this by hand
FV = P(1 + r/n)^(nt) + PMT × [((1+r/n)^(nt) – 1) / (r/n)]
FV = future value, P = initial investment, r = annual rate, n = compounding periods/year, t = years, PMT = regular contribution per period. The first part grows your lump sum; the second grows your recurring contributions. Both compound.
$500/month -- How Account Type Changes the Outcome
- Investing $500/month at 7% for 30 years
- Taxable brokerage: portfolio = $567,000, taxes owed on gains
- Traditional 401(k): portfolio = $567,000, taxes on withdrawals
- Roth IRA: portfolio = $567,000, completely tax-free
- Roth saves ~$50,000-$80,000 in taxes vs. taxable
- 401(k) match adds $100/month from employer = $694,000
Result: Using a Roth IRA vs. a taxable account saves roughly $50-80K in taxes on the same investment -- and an employer 401(k) match is literally free money.
Tips
- Max your employer match before anything else: A 100% match on your 401(k) contribution is an instant 100% return. If your employer matches up to 5% of your salary and you earn $75,000, that is $3,750/year in free money. Nothing beats this return.
- Keep fees below 0.10% on your core holdings: The average expense ratio for an actively managed mutual fund is 0.75%. The Vanguard S&P 500 ETF (VOO) charges 0.03%. On a $500K portfolio, that $3,600/year difference compounds into $320K over 25 years.
- Rebalance annually to maintain your risk level: If your target is 70% stocks/30% bonds, a bull market can shift you to 85/15. Rebalancing sells high (sell stocks) and buys low (buy bonds). One annual rebalance adds 0.5-1% to long-term returns.
- Do not check your portfolio more than quarterly: The average investor underperforms the market by 3-4% annually because they panic-sell during downturns and FOMO-buy during peaks. Set automatic contributions, rebalance once a year, and ignore the noise.
Common mistakes to avoid
- Trying to time the market - Missing the 10 best trading days in the S&P 500 reduces your 20-year return by half. No one consistently predicts these days. The solution: stay invested through everything and keep contributing.
- Not diversifying across asset classes - A portfolio of 100% US stocks had three 50%+ drawdowns in the last 25 years. Adding 20% bonds and 10% international reduces volatility without sacrificing long-term returns significantly.
- Cashing out during a downturn - If you had $100K in the S&P 500 in 2007 and sold at the 2009 bottom, you locked in a 50% loss. If you held until 2024, your $100K became $400K. Downturns are buying opportunities, not exit signals.
FAQ
What is a realistic long-term stock market return?
The S&P 500 has returned about 10% annually before inflation since 1926. After 3% inflation, that is 7% real return. Use 7% for optimistic projections and 5% for conservative ones.
How much do I need to invest to retire with $1 million?
At 7% returns: $500/month for 35 years, $1,000/month for 27 years, or a lump sum of $130,000 today and nothing more. Time is your most powerful ally either way.
Should I invest in individual stocks or index funds?
80% of active fund managers underperform the S&P 500 over 10 years. Individual stock picking is even harder. Index funds give you instant diversification, lower fees, and no need to research companies.
Related resources
- Retirement Calculator Guide - Learn how to calculate your real retirement savings target.