Example calculation: how savings may evolve over time.
Compound Interest Calculator
Compound Interest Calculator
Enter initial capital, a monthly contribution, an assumed return and the term.
For an additional inflation-adjusted view.
Result
Final capital
CHF 109'333.14
- Total contributed
- CHF 58'000.00
- Gain
- CHF 51'333.14
- Total return
- 88.5 %
Example calculation based on an assumed average return – not a guarantee and not financial advice.
Annual development
ContributedGain
Year 1Year 11Year 20
Final capitalCHF 109'333.14
The gain is shown in a lighter tone and sits above the contributed capital.
Annual development: contributed capital, gain and final capital per year.
| Year | Contributed | Gain | Final capital |
|---|---|---|---|
| 1 | CHF 12'400.00 | CHF 567.39 | CHF 12'967.39 |
| 2 | CHF 14'800.00 | CHF 1'286.60 | CHF 16'086.60 |
| 3 | CHF 17'200.00 | CHF 2'165.39 | CHF 19'365.39 |
| 4 | CHF 19'600.00 | CHF 3'211.93 | CHF 22'811.93 |
| 5 | CHF 22'000.00 | CHF 4'434.80 | CHF 26'434.80 |
| 6 | CHF 24'400.00 | CHF 5'843.03 | CHF 30'243.03 |
| 7 | CHF 26'800.00 | CHF 7'446.09 | CHF 34'246.09 |
| 8 | CHF 29'200.00 | CHF 9'253.96 | CHF 38'453.96 |
| 9 | CHF 31'600.00 | CHF 11'277.11 | CHF 42'877.11 |
| 10 | CHF 34'000.00 | CHF 13'526.55 | CHF 47'526.55 |
| 11 | CHF 36'400.00 | CHF 16'013.87 | CHF 52'413.87 |
| 12 | CHF 38'800.00 | CHF 18'751.23 | CHF 57'551.23 |
| 13 | CHF 41'200.00 | CHF 21'751.44 | CHF 62'951.44 |
| 14 | CHF 43'600.00 | CHF 25'027.92 | CHF 68'627.92 |
| 15 | CHF 46'000.00 | CHF 28'594.83 | CHF 74'594.83 |
| 16 | CHF 48'400.00 | CHF 32'467.01 | CHF 80'867.01 |
| 17 | CHF 50'800.00 | CHF 36'660.09 | CHF 87'460.09 |
| 18 | CHF 53'200.00 | CHF 41'190.49 | CHF 94'390.49 |
| 19 | CHF 55'600.00 | CHF 46'075.46 | CHF 101'675.46 |
| 20 | CHF 58'000.00 | CHF 51'333.14 | CHF 109'333.14 |
Assumptions and limits
- The return is assumed to be constant (average per year).
- Monthly compounding, contributions at the end of each month.
- Taxes, fees and exchange rates are not included.
- Actual results may differ substantially.
Frequently asked questions
- What is compound interest?
- With compound interest, the returns earned also earn interest. Capital therefore grows more than proportionally over time.
- Are the results guaranteed?
- No. This is an example calculation based on an assumed average return. Markets fluctuate and the actual return may be higher or lower.
- What does inflation-adjusted mean?
- The real final capital expresses the amount in today's purchasing power, taking the assumed inflation over the term into account.
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Method and sources
Purely mathematical model (compound interest formula): monthly compounding with contributions at month end. No market data or historical returns are used. The calculation runs entirely in your browser; no inputs are stored or transmitted.
Last verified: 2 October 2026