| Year | Total Deposits | Interest Earned | Balance |
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What is an Investment Calculator?
An investment calculator helps you estimate how your money grows over time through compound interest. By entering your initial investment, monthly contributions, expected annual return rate, and investment period, you can see the total value of your portfolio at the end of the period, how much of it comes from your own deposits, and how much is pure interest earned. Compound interest means your returns are reinvested and themselves generate returns, leading to exponential growth over time.
How to Use the Investment Calculator
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Enter your initial lump-sum investment amount.
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Add a monthly contribution if you plan to invest regularly.
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Set the expected annual return rate (e.g. 7% for a diversified index fund).
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Choose how many years you plan to invest.
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Select how often interest is compounded.
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Click Calculate to see your results, including a year-by-year table and growth chart.
This free investment calculator runs entirely in your browser — no data is sent to any server. Use it to plan retirement savings, compare strategies, or understand the power of compound interest. Results are estimates based on a constant rate of return and do not account for taxes, fees, or market volatility.
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