Compound Interest Calculator
Calculate how your investment grows with compound interest. See the final amount, total interest earned, and a year-by-year breakdown.
| Year | Balance | Interest |
|---|---|---|
| 1 | $10,511.62 | $511.62 |
| 2 | $11,049.41 | $537.79 |
| 3 | $11,614.72 | $565.31 |
| 4 | $12,208.95 | $594.23 |
| 5 | $12,833.59 | $624.63 |
| 6 | $13,490.18 | $656.59 |
| 7 | $14,180.36 | $690.18 |
| 8 | $14,905.85 | $725.49 |
| 9 | $15,668.47 | $762.61 |
| 10 | $16,470.09 | $801.63 |
How to Use
- 1
Enter your initial investment amount and annual interest rate
- 2
Set the time period in years and choose compound frequency
- 3
See the final amount, total interest earned, and year-by-year growth
Frequently Asked Questions
What is compound interest?
Compound interest is interest calculated on both the initial principal and the accumulated interest from previous periods — making your money grow faster over time.
What formula is used?
A = P(1 + r/n)^(nt), where P is the principal, r is the annual interest rate, n is compounds per year, and t is the number of years.
How does compound frequency affect growth?
The more frequently interest compounds (daily vs. yearly), the more you earn. Daily compounding produces slightly higher returns than monthly or yearly.
What is the difference between simple and compound interest?
Simple interest only applies to the principal. Compound interest applies to both the principal and accumulated interest, leading to exponential growth over time.
How this is calculated
A = P × (1 + r/n)^(n × t)
Where
- A is the final amount
- P is the starting capital
- r is the annual interest rate ÷ 100
- n is how often interest is compounded per year
- t is the number of years
What this assumes
- The rate is assumed constant for the whole period. Inflation, taxes and fees are not deducted.
This is a calculation, not financial advice.
See how your money grows
A compound interest calculator shows how an investment grows when you earn interest on both your original deposit and the interest already added. Enter a starting amount, rate, time and any regular contributions, and watch the total build.
Compounding is why starting early matters so much — small amounts grow into large ones over time.
What compound interest answers
- Planning long-term savings and investments.
- Comparing the effect of different rates or contributions.
- Understanding why time in the market beats timing it.
- For regular saving see the savings calculator; for investment returns the ROI calculator.
Private projections
Everything is calculated in your browser. Figures are estimates and not financial advice.