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Inflation means money loses purchasing power over time: in a few years the same amount buys less than it does today. From an amount today, an assumed annual inflation rate and a period, this calculator shows two things. First, the real purchasing power - what your money is still worth at the end, expressed in today's money. Second, the amount you would need nominally at the end to afford the same as today. The gap between them is the loss of purchasing power.
The calculation runs entirely locally in your browser, in pure JavaScript - nothing is uploaded and nothing is stored. The model uses a constant annual inflation rate: the real purchasing power is the amount divided by one plus the rate to the power of the years, and the amount needed later is the amount times that same factor. So you see the purchasing power, the loss and the amount needed at a glance, plus the year-by-year progression as a table and a falling curve. Change an input and everything updates instantly.
An honest note: this is a model-based estimate with a constant rate, not financial advice. Real inflation varies from year to year and hits different baskets of goods differently - your personal figure can differ markedly. Interest or investment returns that counteract inflation are deliberately not modelled; the calculator shows the purchasing-power effect alone. The amounts are shown in euros as an example; the underlying maths applies to any currency. For binding statements, consult a qualified adviser.
Specifications
Specifications
Input formats
Form inputs (no file)
Processing
Locally in your browser (JavaScript)
File upload
None
In 3 steps
Enter today's amount, the inflation rate and the period.
Read off the purchasing power, loss and amount needed - with the trend and table.
Change an input; the result updates instantly.
Limitations:A model-based estimate with a constant annual inflation rate. Real inflation fluctuates and hits baskets of goods differently; your personal figure can differ. Interest or investment returns that counteract inflation are not modelled. The period is limited to 1 to 100 years and the rate to at most 100 % per year. Amounts are in euros as an example - the underlying maths applies to any currency. Not financial advice.
FAQ
Are my inputs uploaded?
No. The calculation runs entirely locally in the browser (pure JavaScript); nothing is sent or stored.
How is purchasing power calculated?
The amount is divided by one plus the inflation rate to the power of the number of years; that is its real value in today's money. The amount needed later is the amount times that same factor.
Are interest or investment returns included?
No. The calculator shows the purchasing-power loss from inflation alone. Returns that work against it you can model with the compound-interest calculator.
Is the rate correct for the future?
It is an assumption. Real inflation varies year by year; pick a value that fits your scenario and treat the result as a guide.
Can I use other currencies?
The amounts are shown in euros as an example; the figures hold unchanged for any other currency.