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Compound Interest Calculator
Use this compound interest calculator to estimate long-term savings and investment growth with recurring contributions and flexible compounding frequency.
High precision simulation model
Estimated final value
€196,665.39Total capital€82,000.00
Total interest€114,665.39
+139.8% gain
Interest Capital
Growth levers in your current scenario
- +€50 monthly contribution+€26,046.33
- +1 point annual return+€29,308.77
- +5 years horizon+€103,610.30
Rule of 72
Estimated years to double your money
10.3 yearsAnnual growth table
Year-by-year contributions, interest and accumulated balance.
| Year | Contribution | Interest | Balance |
|---|---|---|---|
| 1 | €3,600.00 | €840.68 | €14,440.68 |
| 2 | €3,600.00 | €1,161.69 | €19,202.37 |
| 3 | €3,600.00 | €1,505.92 | €24,308.29 |
| 4 | €3,600.00 | €1,875.02 | €29,783.31 |
| 5 | €3,600.00 | €2,270.81 | €35,654.12 |
| 6 | €3,600.00 | €2,695.22 | €41,949.34 |
| 7 | €3,600.00 | €3,150.30 | €48,699.63 |
| 8 | €3,600.00 | €3,638.28 | €55,937.91 |
| 9 | €3,600.00 | €4,161.53 | €63,699.44 |
| 10 | €3,600.00 | €4,722.61 | €72,022.06 |
| 11 | €3,600.00 | €5,324.26 | €80,946.31 |
| 12 | €3,600.00 | €5,969.39 | €90,515.70 |
| 13 | €3,600.00 | €6,661.16 | €100,776.87 |
| 14 | €3,600.00 | €7,402.94 | €111,779.81 |
| 15 | €3,600.00 | €8,198.35 | €123,578.16 |
| 16 | €3,600.00 | €9,051.25 | €136,229.41 |
| 17 | €3,600.00 | €9,965.81 | €149,795.22 |
| 18 | €3,600.00 | €10,946.48 | €164,341.70 |
| 19 | €3,600.00 | €11,998.05 | €179,939.75 |
| 20 | €3,600.00 | €13,125.63 | €196,665.39 |
How compound interest works: formula, examples and projections
Compound interest accelerates growth by reinvesting gains. Over long periods, time and recurring contributions can have a major impact on final value.
Compare scenarios by adjusting annual rate, contribution amount and compounding frequency. This helps evaluate realistic savings plans before investing.
A = P(1 + r/n)^nt
Consistent saver
Investing a fixed amount every month builds long-term discipline and compound growth.
1% extra return
A small annual improvement can create a substantial gap over 15-20 years.
Early investor edge
Starting earlier usually matters more than trying to find perfect timing.
Frequently asked questions
It is investment growth where earned interest is reinvested and starts generating additional interest over time. That is why a compound interest calculator is useful for long-term savings projections.