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Inflation calculator
Geschrieben von
Janine El-Saghir
Finanzanalystin & Wirtschaftsredakteurin
Dr. Janine El-Saghir ist eine erfahrene Finanzanalystin und Wirtschaftsredakteurin, die sich darauf spezialisiert hat, komplexe Finanzthemen für Anleger verständlich aufzubereiten. Mit über 16 Jahren Erfahrung...
- The calculator answers four questions: future price, initial amount, inflation rate and duration – depending on which three figures you already know.
- It assumes a constant rate. Which rate is realistic decides the result – the official German figures are in the table below.
- German annual inflation ran between 2.2% and 6.9% from 2021 to 2025. Using the ECB’s 2% target puts you at the low end of recent experience.
- Purchasing power and price are two sides of the same calculation: at 2%, €10,000 loses roughly 45% of its purchasing power over 30 years, while the same basket of goods rises from €10,000 to €18,114.
Which inflation rate to enter
The rate field decides everything the calculator returns – and it is the one field nobody knows for certain. The 2.5% default is a compromise, not a measurement. Three official reference points help:
| Year | Inflation rate | Context |
|---|---|---|
| 2021 | 3.1% | Post-pandemic catch-up effects and the return to the full VAT rate |
| 2022 | 6.9% | Record high for the series, driven by energy and food |
| 2023 | 5.9% | Price pressure easing, still far above target |
| 2024 | 2.2% | Back close to the ECB target |
| 2025 | 2.2% | Second consecutive year at this level |
| Source: Federal Statistical Office of Germany, press release of 16 January 2026. The most recent monthly figure is 2.9% for August 2026 (preliminary, as of 31 August 2026). | ||
Both figures come from the Federal Statistical Office and both were correct at the time. In January 2023 the office reported an annual rate of 7.9% for 2022, calculated on the then-current index base of 2015 = 100. Shortly afterwards the consumer price index was rebased to 2020 = 100 and the series recalculated; since then the office reports 6.9% for 2022 and describes it as the record high.
For the calculator the distinction barely matters. For checking sources it does: older pages frequently still carry the 7.9% without naming the base year.
That gives three defensible assumptions, depending on what you are testing:
- 2.0% – the policy target. The European Central Bank makes sure, in its own words, that inflation “remains low, stable and predictable: 2% over the medium term”. For retirement planning across decades, this is the scenario in which monetary policy works.
- 2.2% – the recent normal. The figure for both 2024 and 2025.
- 4.1% – what actually happened. The arithmetic mean of 2021 to 2025. Compounded, prices rose 21.9% across those five years: what cost €100 in early 2021 cost about €122 by the end of 2025 – or put the other way, €100 from back then had the purchasing power of €82.
Calculate your plan at 2.0% and again at 4.1%. The spread between the two results is a more honest answer than either number alone. For €10,000 over 30 years it runs from €5,521 down to €2,996 of remaining purchasing power.
Purchasing power and price: two sides of one calculation
The calculator returns both perspectives at once, and they are regularly confused.
Future purchasing power answers: what will my money be worth later? An amount of €10,000 stays €10,000 in nominal terms – it simply buys less.
Future price answers the opposite question: what will something that costs €10,000 today cost later? Here the basket stays the same and the price rises.
| Period | Purchasing power at 2.0% | Price at 2.0% | Purchasing power at 4.1% | Price at 4.1% |
|---|---|---|---|---|
| 10 years | €8,203 | €12,190 | €6,691 | €14,945 |
| 20 years | €6,730 | €14,859 | €4,477 | €22,336 |
| 30 years | €5,521 | €18,114 | €2,996 | €33,383 |
| Own calculation using the compound interest formula at exactly 4.1% – the rounded mean of the years 2021 to 2025 (unrounded 4.06%). | ||||
Both columns describe the same process. For sizing a savings rate the price column is the right one; for judging money you already hold, the purchasing power column.
One rule of thumb worth remembering: at 2% purchasing power halves after roughly 35 years, at 2.9% after 24 years, at 4.1% after 17 years. At the 2022 record rate of 6.9% it would have halved in just over ten.
The four calculation modes
The selector at the top sets which figure you are looking for. You supply three values, the calculator returns the fourth:
- Future price (default): from initial amount, duration and rate. The common case – today’s cost projected forward.
- Initial amount: from future price, duration and rate. Useful for restating a past price in today’s money.
- Inflation rate: from two amounts and a duration. This gives the actual annual increase of a specific item – for example an insurance premium that rose from €300 to €420 over eight years.
- Duration: from two amounts and a rate. Answers how long a given loss of purchasing power takes.
Where the numbers come from: CPI, HICP and your own basket
There is no single inflation rate, but several measures with different purposes:
- The consumer price index (CPI, in German VPI) of the Federal Statistical Office measures price developments in Germany. It is the figure German news reports call “the inflation rate”, and the reference for index-linked clauses in contracts.
- The harmonised index of consumer prices (HICP) follows rules that are uniform across Europe. This is what the ECB looks at when setting interest rates. For the same country, the two measures routinely differ by one or two tenths of a point.
- Your personal inflation rate is different again. The official basket represents an average household. A tenant with a long commute experiences an energy price shock very differently from an owner-occupier without a car.
For the calculator this means the rate you enter is an assumption about your household, not about the economy.
They are not final. The most recent monthly figure is always preliminary and gets refined later. The Federal Statistical Office also corrects published figures after the fact – recently for the year 2025 and for March 2026.
They are not a forecast. An inflation rate describes the past. The calculator extends it because you cannot calculate without an assumption – not because it has to repeat.
What this means for investing
The calculation is only complete once you set the interest you earn against it. What matters is not the interest rate but the gap between interest and inflation – the real return.
An instant-access savings account paying 2% while inflation runs at 2.9% loses roughly 0.9% a year in real terms, even though the balance grows. The statement shows growth; purchasing power shrinks. That gap is why long-term saving without real assets is difficult.
One more thing shifts the arithmetic for investors resident in Germany: the flat-rate withholding tax applies to nominal gains, not real ones. The portion of interest that merely compensates for inflation is taxed as well.
How investment income is taxed here is covered on capital gains tax in Germany. For how capital develops under compounding, see the compound interest calculator and the savings calculator.
Limits of this calculation
- A constant rate does not exist. The calculator applies the same value every year. In reality the rate moved between 2.2% and 6.9% from 2021 to 2025. For the order of magnitude that matters little; for individual years, a great deal.
- The basket changes. Over 30 years what households buy shifts. An index across such periods is not comparing identical goods.
- False precision. The calculator returns figures down to the cent. That precision describes the arithmetic, not reality – it rests entirely on a rate nobody knows.
- No taxes or fees. Neither withholding tax nor custody or account fees enter the calculation.
Why Germans are particularly sensitive about this
Two events still shape how monetary value is discussed in Germany. In the hyperinflation of 1923 the mark lost value so completely that wages had to be paid daily; after the currency reform of November 1923, Germany’s war debts of 154 billion marks were worth, according to the Deutsche Bundesbank, 15.4 pfennigs. In the second currency reform of 1948 the D-Mark was introduced and exchanged against the Reichsmark at a rate of 1 to 10 – ten Reichsmark bought one D-Mark. Savers and holders of monetary assets were, in the Bundesbank’s account, largely expropriated.
Both times it was monetary assets that were hit and real assets that were spared. That is the historical root of the advice not to hold long-term wealth exclusively in cash.
Sources
- Federal Statistical Office of Germany: Inflation rate at +2.2% in 2025, press release of 16 January 2026 (annual figures 2021 to 2025)
- Federal Statistical Office of Germany: Consumer price index and inflation rate (monthly figure August 2026, preliminary, as of 31 August 2026)
- European Central Bank: What is inflation? (inflation target, HICP)
- Deutsche Bundesbank: Inflation – Lehren aus der Geschichte (1923 and 1948; German only)
Frequently asked questions
An inflation calculator estimates how prices or purchasing power may change over time. The calculation is based on variables such as the inflation rate, the time horizon, and the price levels before and after inflation.
Inflation refers to the general increase in prices across an economy. When inflation rises, the purchasing power of money declines because goods and services become more expensive.
Inflation is typically calculated using national statistics that track changes in the prices of goods and services over time. Statistical agencies compile different measures of inflation, such as the Consumer Price Index (CPI) or the Retail Price Index (RPI).
These indices are based on a representative basket of household purchases, including housing, energy, and food prices. The resulting inflation data is used to estimate the average inflation rate in an economy and to analyze how price developments relate to broader economic indicators such as gross domestic product.
When prices increase, the same amount of money can buy fewer goods and services. This means that the real value of money decreases over time.
Inflation calculators work with assumed inflation rates and simplified models. Actual inflation can vary depending on economic conditions, so results should be interpreted as estimates rather than exact predictions.
Investors often use inflation calculations to estimate how the real value of their capital may change over time. When you invest in assets such as stocks, bonds, or savings products with a fixed rate of return, inflation determines whether the return remains positive after inflation is accounted for.
Different inflation rates may be used depending on the purpose of the calculation. Some users choose historical averages, while others prefer conservative assumptions when estimating long-term price changes and inflation-adjusted investment returns.