Grow your wealth with smarter math
Free investment calculators to model compound interest, returns, dividends, and inflation impact on your portfolio.
Why These Calculators Matter
Investment success depends on understanding the power of time, returns, and compounding. Our calculators help you visualize the impact of different strategies and make more informed financial decisions.
Whether you're saving for retirement, building wealth, or analyzing a specific investment, these tools provide instant clarity on your financial projections.
Key Concepts in Investing
Compound Interest: The process where your earnings generate their own earnings, creating exponential growth over time. Even modest returns can accumulate significantly over decades.
Return on Investment (ROI): The percentage gain or loss on an investment relative to what you put in. Annualized ROI normalizes returns across different time periods for fair comparison.
Dollar Cost Averaging: Investing a fixed amount regularly regardless of market price. This approach reduces timing risk and can outperform lump sum investing in volatile markets.
Dividend Reinvestment: Using dividend payments to buy more shares creates a compounding effect that can significantly boost long-term wealth.
Inflation Impact: Understanding real returns (adjusted for inflation) is crucial. A 5% return in a 3% inflation environment is actually only a 2% real gain in purchasing power.
The power of starting early
The most important variable in investing isn't the rate of return or the amount you invest — it's time. Due to compound interest, every year you delay starting costs you more than you might think. A 25-year-old investing $200 per month at 8% annual returns will have approximately $700,000 at age 65. A 35-year-old investing the same $200 per month at the same rate will have about $300,000. The ten-year head start roughly doubles the final amount, even though the total contributions only differ by $24,000.
This is why we built these calculators — to help you see the numbers clearly so you can make informed decisions about when and how much to invest. Our compound interest calculator lets you run these scenarios with your own numbers in seconds.
How our calculators work
Every calculator runs entirely in your browser. Your financial data is never sent to our servers, stored in a database, or shared with anyone. We use standard financial formulas — the same ones taught in finance textbooks and used by financial planners — and we show the full breakdown of the math so you can verify results against your own calculations.
Our calculators use simplified models that assume constant rates of return, which doesn't perfectly reflect real-world market volatility. They also don't account for taxes, transaction fees, or fund expense ratios unless specifically noted. Always consider these factors and consult a financial professional before making major investment decisions.