Enter how much you have today, how much you can contribute each month and a sample rate. You will instantly see how much you could have and how much of it comes from compound interest.
The preloaded values are an example: replace them with your own figures.
Estimated result
With these figures, in 10 years you would have $18.207,33: you contributed $13,000.00 and compound interest added $5.207,33.
For every $1 you contribute, you would end up with $1.40.
How your money grows year by year
| Year | Contributed | Interest | Balance |
|---|---|---|---|
| Year 1 | $2.200,00 | $95,23 | $2.295,23 |
| Year 2 | $3.400,00 | $270,36 | $3.670,36 |
| Year 3 | $4.600,00 | $530,29 | $5.130,29 |
| Year 4 | $5.800,00 | $880,27 | $6.680,27 |
| Year 5 | $7.000,00 | $1.325,85 | $8.325,85 |
| Year 6 | $8.200,00 | $1.872,93 | $10.072,93 |
| Year 7 | $9.400,00 | $2.527,76 | $11.927,76 |
| Year 8 | $10.600,00 | $3.297,00 | $13.897,00 |
| Year 9 | $11.800,00 | $4.187,69 | $15.987,69 |
| Year 10 | $13.000,00 | $5.207,33 | $18.207,33 |
Results are for reference only and are not actual figures. Values depend on the country, the financial institution, taxes and current laws, and must be validated with an authorized financial institution. Banco.guru is an educational guide to what can be achieved; it does not offer products or personalized financial advice.
Tips for using this result
- What moves the result the most is time: try adding 5 years and compare.
- A small but steady contribution usually matters more than one large one-off contribution.
- Always compare with the real return: if inflation is high, your real gain is smaller.
- Check whether the rate you are offered is nominal or effective (APY): it changes the result.
What is compound interest?
Compound interest is interest calculated not only on the money you put in, but also on the interest you have already earned. Each time interest is added to the balance (compounding), the next calculation is made on a larger base. That is why people talk about “interest on interest” and a snowball effect: growth looks slow at first and speeds up over the years.
How does this calculator work?
The tool simulates month by month: it adds your monthly contribution at the end of each month and applies the equivalent monthly rate based on the compounding you choose (monthly, quarterly, annual or daily). At the end it shows the estimated balance, how much you contributed and how much came from interest, plus a chart and a year-by-year table.
The basic formula, without contributions, is: Final balance = Capital × (1 + rate / n)n × years, where n is the number of compounding periods per year. With regular contributions, the future value of each deposit is added.
A simple example
With the sample values (capital of 1,000, a contribution of 100 a month, 6% a year for 10 years with monthly compounding) you would end up with a little over 18,000, of which about 13,000 are your contributions and the rest is compound interest. If you keep the same habit for 20 years, the interest almost matches everything you contributed. That is why starting early matters more than starting big.
What to keep in mind before using the result
- The rate is not guaranteed in many investments: the calculator assumes a constant rate, which does not always happen in real life.
- Taxes and fees reduce the net return. If your investment has withholdings or maintenance costs, the real result will be lower.
- Inflation means the same amount buys less in the future. To see the value in today’s money, use the inflation calculator.
- Rates on financial products vary by country, institution and time. Always check the official information from the institution and from your country’s regulator.
Frequently asked questions
What is the difference between simple and compound interest?
With simple interest, interest is always calculated on the initial capital. With compound interest it is calculated on the capital plus accumulated interest, so the balance grows faster over time.
What does monthly compounding mean?
It means interest is added to your balance every month. With the same nominal annual rate, compounding more often produces a slightly higher result.
Does this calculator tell me how much I will really earn?
No. It is an educational estimate based on the figures you enter. The real result depends on the product, the institution, taxes and market conditions.
What rate should I use?
The one stated in the contract or in the official information for the product you are evaluating. If you do not know it, try several scenarios (for example 3%, 6% and 9%) to see a range.
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