How this works
This runs the compound-growth formula in two directions: it shows what a present amount will cost in the future at your chosen inflation rate, and — the reverse — what that same future amount would be worth in today's purchasing power.
Common questions
Where does the inflation rate I should use come from?
There's no single right number — official inflation indices track an average basket of goods, which may differ meaningfully from your personal spending pattern. Many people use a country's long-run average as a rough planning figure.
How is this different from a regular compound interest calculation?
It's the same formula, just interpreted differently — instead of money growing, it's prices growing (or purchasing power shrinking), which is why the two output numbers move in opposite directions from the input amount.