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Purchasing Power Calculator
Find out what your money will really be worth down the road. Enter an amount, an average inflation rate and a horizon, then press Calculate to see how buying power erodes.
Written by TopicDrill Editorial Team·Updated June 2026
Buying power over time
Real value Today's amount
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How the purchasing power calculator works
Inflation quietly shrinks what your money can buy. The tool takes the amount you have today and applies your chosen average inflation rate to each future year, then reports two figures: the real value, which is what that money will buy later stated in today's dollars, and the equivalent amount you would need then to buy the same things.
The chart shows the real value sloping downward year by year while the dashed line marks your original amount. The gap between them is the buying power that inflation has quietly taken away.
A worked example
Picture 50,000 dollars sitting in cash with inflation averaging 3 percent a year. After 20 years that money still reads 50,000 dollars, but it only buys what about 27,700 dollars buys today. You would need roughly 90,300 dollars in 20 years to match the buying power of 50,000 dollars now.
Things to keep in mind
Actual inflation varies year to year and differs by what you spend on, so treat the result as a guide rather than a forecast. You can track real inflation figures from the U.S. Bureau of Labor Statistics. To see how investing could outrun inflation, try our future value calculator.
Frequently asked questions
What is purchasing power?
Purchasing power is how much a fixed amount of money can actually buy. As prices rise with inflation, the same dollar buys less, so its purchasing power falls even though the number on the bill stays the same.
How does this calculator measure inflation's effect?
It discounts today's amount by the average inflation rate for each year ahead. The real value is what your money will buy later stated in today's dollars, while the equivalent needed is the larger nominal sum required then to match what you can buy now.
What inflation rate should I use?
Long run inflation in many developed economies has averaged around two to three percent a year, though it swings with the economy. Use a rate that reflects your outlook or your own cost of living, and try a few values to see the range of outcomes.
How can I protect my money from losing buying power?
Holding cash that earns less than inflation steadily loses value. Investing so your money grows at or above the inflation rate, or using inflation linked assets, helps preserve purchasing power, though every option carries its own risk.
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