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Updated October 9, 2026
Inflation Erosion Calculator
Enter an amount, a time horizon, and an annual inflation rate. The calculator shows what your money will still buy, what inflation silently takes, and how much you would need in the future to buy the same things.
-Purchasing power left
-Eaten by inflation
-You would need
-Value kept
What this calculator does
Inflation compounds against you the way interest compounds for you. This calculator divides your amount by (1 + inflation rate) raised to the number of years, showing the purchasing power that remains. The chart draws the decay curve so you can feel how the damage accelerates: the first years look gentle, the later years are brutal.
Worked example
$10,000 at 8% annual inflation for 10 years keeps only about $4,632 of purchasing power. You would need about $21,589 in year 10 to buy what $10,000 buys today. At 8%, prices double roughly every 9 years (the rule of 72: 72 / 8 = 9).
Why this matters more in high-inflation countries
In Argentina, Turkey, Nigeria, and Pakistan, savers have lived through years where 20 to 100%+ annual inflation was normal. At 50% inflation, money halves in value every 17 months. That is why our real salary converter and savings vs. inflation visualizer exist: nominal amounts lie, and only inflation-adjusted math tells the truth. The currency reality explainer walks through how official and parallel exchange rates complicate the picture.
Limitations
The calculator assumes a constant inflation rate, which never happens in reality; it compounds annually rather than monthly; and it ignores taxes, fees, and any return your money might earn. For savings that earn interest, use the savings vs. inflation visualizer instead.
Planning estimate only. Results use the list prices shown and may differ from your actual bill. Terms
Frequently asked questions
How do you calculate the effect of inflation?
Divide the amount by (1 + inflation rate) raised to the number of years. That gives the purchasing power remaining in today's money.
What is the rule of 72?
Divide 72 by the annual inflation rate to estimate how many years it takes prices to double. At 8% inflation, prices double in about 9 years.
Does inflation affect savings accounts?
Yes. If your savings earn 3% while inflation is 8%, your real return is roughly negative 5%. Money in a low-rate account quietly loses buying power every year.
What inflation rate should I use?
Your country's recent consumer price index (CPI) is the honest default. For planning, also run a stress scenario 5 to 10 points higher.
Is this calculator useful for Argentina or Turkey?
Yes, and it is sobering: at 50% annual inflation, $10,000 keeps only about $1,316 of purchasing power after 5 years. Pair it with the real salary converter for local currencies.