Understanding Inflation: How Rising Prices Erode Your Purchasing Power
Inflation is the rate at which the general level of prices rises over time, reducing what each dollar can buy. A 3% annual inflation rate sounds small, but compounded over 25 years it cuts purchasing power nearly in half. Understanding inflation is fundamental to any long-term financial plan.
How inflation is measured
Most countries track inflation using a Consumer Price Index (CPI), which measures price changes for a representative basket of goods and services — food, housing, transportation, healthcare, and more. When the CPI rises 4% year over year, that means the same basket costs 4% more than it did a year ago.
How inflation compounds over time
Inflation compounds just like interest — in reverse. At 3% annual inflation, something costing $100 today costs $134 in 10 years and $181 in 20 years. The inflation calculator lets you enter a current amount, an inflation rate, and a number of years to see what that amount needs to become just to maintain the same purchasing power.
Inflation and your investments
For an investment to grow your real wealth, its return must exceed inflation. A savings account paying 2% during a 4% inflation period is actually losing 2% in purchasing power per year. This is why financial advisors often emphasize "real returns" (nominal return minus inflation rate) rather than headline figures.