# Inflation Erosion Calculator

> Free inflation calculator: enter an amount, years, and annual inflation to see remaining purchasing power, with a chart of value decay over time.

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.

*Interactive tool: enter your values at https://toollantern.win/inflation-erosion-calculator/ and results update instantly in your browser.*

## 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](/real-salary-converter/) and [savings vs. inflation visualizer](/savings-vs-inflation/) exist: nominal amounts lie, and only inflation-adjusted math tells the truth. The [currency reality explainer](/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.

## 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.

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Interactive version: https://toollantern.win/inflation-erosion-calculator/