This calculator shows how much purchasing power a fixed amount of money can lose over time at a given inflation rate. It makes visible the difference between keeping the same number in an account and being able to buy the same basket of goods and services.
Inflation Calculator
Measure how much your money loses if you do not invest and what real value it would retain over time.
SIMULATOR
Your numbers
Recalculates instantly as you move the sliders.
FUTURE EQUIVALENT€36,122
REAL VALUE€11,074
PURCHASING POWER LOST€8,926
HORIZON20 years
Bars = remaining purchasing power year by year; the top figure shows the nominal dollars needed to keep the same buying level.
Save my scenario of €11,074 real value. The future equivalent rises, but your real value falls: that is the friction investing tries to fight.
Enter the amount, the average annual inflation rate and the number of years. The tool calculates the real value of that amount in future purchasing power and the future nominal amount you would need to buy the same thing.
Real value is calculated by dividing the starting amount by (1 + inflation) raised to the number of years. The future nominal equivalent is calculated by multiplying by the same factor. The difference is lost purchasing power.
At 2% annual inflation, $20,000 has the purchasing power of roughly $13,460 after 20 years. The account balance may still show the same number, but the real capacity to buy has fallen by about $6,540.
The message is not that cash disappears, but that idle money loses value quietly. Inflation compounds against purchasing power in the same way return compounds in favor of invested capital.
The main mistake is confusing nominal safety with real safety: the number can remain stable while purchasing power falls. Another mistake is applying one headline inflation rate to every personal expense category.
Assumptions: inflation is modeled as a constant average rate. Actual inflation changes every year and can be much higher in specific categories.
INE — Consumer Price Index (CPI) · European Central Bank — Price stability objective
Inflation Calculator, with context
What inflation rate do I use as a scenario?
The ECB medium-term reference objective is 2%; test several scenarios to see how sensitive the result is.
What is the difference between nominal and real value?
Nominal value is the number. Real value is what that number can buy after inflation.
How is inflation measured?
In Spain it is commonly measured through the CPI, published by INE.
Does this mean I should hold no cash?
No. A liquid emergency buffer is useful; the question is what happens to money you do not need in the short term.
Illustrative results for educational purposes · Educational information, not financial advice.