Not Financial Advice. This calculator is for educational purposes only. Results are estimates and do not constitute professional financial, legal, or tax advice. Consult a certified financial professional before making decisions. Full disclaimer →
What could your money
become?
See how investing in the stock market grows your wealth over time — and how many years of work your returns could replace.
Not investing costs you $326,990 in missed growth. That's 6y 3mo 13d of work you'd have to do instead. Your money can work so you don't have to.
At 3% inflation over 20 years, your $456,990 will only buy what $253,024 buys today. That's why investing matters — it fights inflation.
Why invest in the stock market?
The stock market has historically been one of the most powerful wealth-building tools available. The S&P 500 index, which tracks 500 of the largest US companies, has delivered average annual returns of approximately 10% over the past century (roughly 7% after inflation). This means a $10,000 investment would grow to approximately $67,000 over 20 years without adding any additional money. When you combine market returns with regular monthly contributions, the results can be life-changing. Our Investment Calculator shows you exactly how these numbers play out for your specific situation.
We translate investment returns into work hours because it makes the opportunity cost of not investing painfully clear. If keeping $100,000 in cash instead of investing it costs you $150,000 in missed returns over 15 years, that's equivalent to years of your working life lost — money that could have been earned while you slept. Past performance does not guarantee future results, but understanding historical patterns helps you make more informed decisions.
Dollar-cost averaging explained
Dollar-cost averaging (DCA) means investing a fixed amount at regular intervals, regardless of market conditions. When prices are high, your fixed amount buys fewer shares. When prices are low, it buys more shares. Over time, this averages out your cost per share and removes the stress of trying to time the market. Most financial experts recommend DCA for ordinary investors because it's simple, consistent, and historically effective. Our calculator models DCA through the monthly investment slider.
Understanding risk and volatility
The stock market does not go up in a straight line. In any given year, the market can swing dramatically — gaining 30% or losing 30%. This is why our calculator includes bear market and bull market scenarios. Short-term volatility is the price you pay for long-term returns. Historically, the stock market has recovered from every downturn and gone on to set new highs. The key is having a long enough time horizon (ideally 10+ years) and the discipline to stay invested during downturns. Diversification across different types of investments also helps manage risk.
The role of dividends
Dividends are cash payments that companies make to shareholders, typically quarterly. When you reinvest dividends (using them to buy more shares instead of spending them), you accelerate your compound growth significantly. Historically, reinvested dividends have accounted for roughly 40% of the S&P 500's total return. Our calculator separates capital appreciation from dividend income so you can see how much each contributes to your wealth. A dividend yield of 2% might seem small, but compounded over 20-30 years, it adds substantially to your portfolio.
Frequently Asked Questions
How much should I invest per month?
A common guideline is to invest 15-20% of your gross income for retirement. However, any amount is better than nothing. Even $100 per month invested consistently over 30 years at 10% annual return grows to over $200,000. Start with what you can afford and increase it over time as your income grows. Our calculator lets you experiment with different monthly amounts to find a realistic target.
What's the difference between stocks and index funds?
Individual stocks represent ownership in a single company, while index funds hold hundreds or thousands of stocks in one package. Index funds provide instant diversification and lower risk than individual stocks. The S&P 500 index fund, for example, gives you ownership in 500 of America's largest companies with a single purchase. Most financial experts recommend index funds for ordinary investors because they're simple, low-cost, and historically outperform most actively managed funds.
How does inflation affect my investments?
Inflation reduces the purchasing power of your money over time. At 3% inflation, something that costs $100 today will cost $181 in 20 years. This is why our calculator includes an inflation-adjusted view of your portfolio — showing you the real purchasing power of your future wealth in today's money. Stocks have historically been one of the best hedges against inflation because companies can raise prices along with inflation.
Is this investment calculator accurate?
Our calculator provides projections based on assumed constant annual returns, which is a simplification. Real market returns vary dramatically year to year. The calculator is best used to understand general trends and compare scenarios rather than predict exact outcomes. Historical average returns for the S&P 500 (~10%) include both booming and crashing years averaged together. This tool is for educational purposes only and does not constitute investment advice. Past performance does not guarantee future results.
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