Inflation Calculator
See how inflation erodes the real value of your money
Inflation Calculator Inputs
Display currency for the results
$
The sum of money you want to analyse (e.g., 10000)
%
Expected average inflation per year (e.g., 3 for 3%)
Your time horizon in years (e.g., 20)
Inflation is the rate at which the general level of prices rises over time, steadily reducing what each unit of currency can buy. This calculator shows two sides of the same coin: how much the purchasing power of a fixed amount of money shrinks over your time horizon, and how much more the same basket of goods will cost in the future. It works in any currency, which matters for internationally diversified savers whose money is exposed to different inflation rates.
Future Value = Amount × (1 + inflation) ^ years
Step 1: Choose your currency and enter the amount of money you want to analyse.
Step 2: Enter an expected average annual inflation rate — for example 3 for 3%. Consider testing a low, central and high scenario.
Step 3: Set your time horizon in years — for example 20 for a long-term retirement view.
Step 4: Click Calculate to see the future purchasing power of your money, the future cost of the same goods, and a year-by-year breakdown.
What Is Inflation and Purchasing Power?
Inflation is a sustained increase in the general level of prices for goods and services. When inflation is positive, each unit of currency buys a little less than it did before — this is the erosion of purchasing power. Economists usually measure it with a consumer price index that tracks the cost of a representative basket of goods, and the annual percentage change in that index is the inflation rate you hear quoted in the news.
Purchasing power is simply what your money can actually buy. Two amounts can be numerically identical yet represent very different real wealth: a fixed sum of cash held for twenty years keeps the same face value but commands far fewer goods at the end. This is why a realistic financial plan models money in real terms — adjusted for inflation — rather than relying on nominal figures alone.
Why Inflation Compounds Against You
Real Return ≈ Nominal Return − Inflation
Inflation compounds exactly like investment returns, only in the wrong direction. A 3% annual inflation rate does not subtract a flat amount each year; it applies to a steadily rising price level, so the absolute loss grows over time. Over a few years the effect is modest, but across a multi-decade horizon a moderate inflation rate can cut the real value of idle cash by a third, a half, or more.
This is why holding too much in cash carries a hidden cost. To preserve purchasing power, money must earn a return at least equal to inflation; to build real wealth, it must earn more. The figure that ultimately matters is the real return — the nominal return minus inflation — because that is what actually changes how much you can buy.
Inflation, Currencies and Net Worth
For investors and expats who hold money across several currencies, inflation is not a single number. Each currency has its own inflation rate, so the real value of your holdings depends on both market performance and the inflation of the currency they are denominated in. A portfolio that looks stable in nominal terms can be quietly losing real value in a high-inflation currency while gaining it in a low-inflation one. Tracking net worth in real, inflation-adjusted terms across currencies gives a far truer picture of whether your wealth is actually growing.
Related Calculators
Inflation is the counterweight to growth, so it is best understood next to the tools that model returns. To see how contributions and compounding build a balance over time, use the compound interest calculator, then compare that nominal growth against the purchasing power this page shows. To plan how long a portfolio lasts once you are drawing on it, the savings plan (SIP) calculator helps you project whether your contributions will outpace rising prices.
Frequently Asked Questions About the Inflation Calculator
Inflation is a sustained rise in the general level of prices, which means each unit of currency buys fewer goods and services over time. Your money is not physically shrinking, but its purchasing power is: if prices rise 3% a year, something that costs 100 today costs about 103 next year, so the same 100 buys less. Over decades this compounds, and cash left uninvested can lose a large share of its real value.
Many long-term plans use a rate near a central bank target of around 2% to 3% per year, but actual inflation varies by country and period and has been considerably higher at times. A sensible approach is to model a few scenarios — for example a low, central, and high inflation rate — rather than relying on a single figure, and to check your own country's recent consumer price index for context.
Because what matters for building wealth is your real return — your return after inflation — not the headline nominal number. An investment that returns 4% in a year when inflation is 3% has only grown your purchasing power by roughly 1%. For internationally diversified investors, inflation also differs across currencies, so the real value of holdings depends on both market returns and the inflation rate of each currency you hold.
Track Your Net Worth in Real Terms
Beating inflation is the real goal of investing. With Worthmap you can track your net worth across currencies, monitor your investments, and see whether your wealth is growing in real terms.
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