Compound Interest Calculator: Use the Magic of Compounding for Expats in Germany
Compound interest is the single most important factor in long-term wealth building. Compare how different forms of saving develop over time and why ETFs outperform traditional bank products.
6.0 %
Your Final Capital (6,0%)
0 €
Invested Capital:0 €
Interest Earned:0 €
The calculation is based on monthly compounding.
Comparison
How the calculation works:
1. Interest on Interest: Your capital grows because you earn returns not just on your initial investment, but also on the interest already earned. This "snowball effect" becomes faster over time.
2. Time is your friend: The longer you stay invested, the more powerful the growth becomes. Small monthly amounts can lead to huge results over decades thanks to the exponential curve.
3. Nominal Value: The main result shows the future amount of money. Keep in mind that prices will also rise over time, meaning the future amount will buy less than it would today.
4. Consistent Saving: The calculator assumes you invest your savings rate every month. Regularity is often more important for the final result than the perfect timing.
Time is more important than money for Expats in Germany
As you can see in the chart above, your money grows faster over time, not just in a straight line. The longer your money works, the steeper the curve rises.
A comparison makes it clear:
Deposits (Nominal): The total of all your monthly savings.
Purchasing Power of Deposits: What your savings are still worth after inflation (at 0% interest).
Savings Account (approx. 2%): You only offset the loss of value from inflation. Real wealth building does not happen here.
ETF Return (6.0%): After inflation, you have a real increase. Compound interest ensures fast growth.
Compound interest makes your money grow much faster in the second half of the time. The earlier you start, the longer the money works for you.
Requirements for Expats
Valid German Address (Anmeldung)
German Bank Account (IBAN)
German Tax ID
Frequently Asked Questions
Is 6.0% return realistic?
Historically, global stock markets have often achieved an average return of approx. 7-9% per year over long periods (15+ years). 6.0% is therefore a rather conservative assumption for a broadly diversified ETF portfolio.
What is the difference between real and nominal return?
Nominal return is the pure growth on paper (e.g., 6.0%). Real return subtracts the inflation rate from this (e.g., 2.0%). Only what remains after inflation actually increases your wealth and purchasing power.
Why is inflation so dangerous?
Inflation devalues your savings. With 2% inflation, the purchasing power of your money halves every 35 years. Your goal must be to achieve a return bigly ABOVE the inflation rate.
How do I minimize the risk of an ETF investment?
The most important tool is diversification (broad spreading) across thousands of companies worldwide and a long investment horizon. Short-term fluctuations then play a minor role in the compound interest success.
Should I rather save monthly or invest a lump sum?
Both! A lump sum investment immediately benefits fully from compound interest. Monthly rates help you build discipline and profit from the cost-average effect. You can combine both in the calculator.
Is tax considered in the calculator?
This basic calculator shows the gross development. With ETF investments, taxes only fall due upon sale (withholding tax). In a net policy, you can push these taxes far into the future (tax deferral), which bigly increases compound interest again.
Legal Note: This calculator is for non-binding information and orientation. It does not replace individual advice. The calculations are based on standard financial mathematical formulas. Daniel Hüsken accepts no liability for the accuracy of the results.
Ignite the Turbo?
Let's calculate together how much you need to save monthly to achieve your financial goals – naturally high-yield on an ETF basis.
