Real Income Erosion Calculator
See how much inflation has eaten into your income's purchasing power.
Source: World Bank, Consumer price index (FP.CPI.TOTL) · Per-country most recent published year, rebased to 2015 = 100 · last verified 2026-09-12
How this is calculated
Your original income is scaled by the ratio of the country's CPI index between your two chosen years — deflating it shows what that income is really worth today, while inflating it shows how much money you'd need today to match its original purchasing power.
This tool applies the same inflation-adjustment logic as the Inflation Adjusted Return calculator, but to a fixed historical income figure rather than an investment return — both answer the same underlying question of what a nominal figure is really worth once rising prices are accounted for. To see how compounding investment growth compares against this same erosion effect, see the Compound Interest calculator.
Frequently asked questions
- What's the difference between "real income today" and "amount needed today"?
- Real income today is what your original (unchanged) nominal income is actually worth now, after inflation — always less than the original amount. Amount needed today is how much money you'd need now to match the original purchasing power — always more than the original amount.
- Why do some countries show much bigger erosion than others?
- Countries with high average inflation (hyperinflation economies especially) erode purchasing power far faster than low-inflation, developed economies — try Argentina or Turkey for a dramatic example.
- Is this an official CPI series?
- No — the index is built by smoothly compounding each country's average annual inflation rate from a 2015 base, so it will not match a year-by-year official series.
- What is real income erosion?
- Real income erosion is the loss of purchasing power a fixed nominal income suffers over time due to inflation — even if your income number stays exactly the same, rising prices mean it buys less and less as years pass.
- How is the inflation adjustment calculated?
- Your original income is scaled by the ratio of the country's CPI index between your start and end years — dividing by that ratio (deflating) shows what the income is worth today, while multiplying by it (inflating) shows how much you'd need today to match the original purchasing power.
- What is the difference between nominal and real income?
- Nominal income is the raw dollar (or local currency) figure, unadjusted for inflation. Real income adjusts that figure for changes in the cost of living, showing actual purchasing power rather than just the number on a payslip or account statement.
- Over 10 years of 5% inflation, how much purchasing power is lost?
- Compounding 5% inflation for 10 years reduces purchasing power to roughly 1 / 1.05¹⁰ ≈ 61% of the original — meaning about 39% of purchasing power is lost over that decade, even though the effect might feel gradual year to year.
- How can I protect against income erosion?
- The main protections are securing income growth (raises, promotions) that outpaces inflation, and investing savings in assets that historically outpace inflation over the long run — see the Inflation Adjusted Return calculator to check whether a given investment return is actually keeping up with inflation.