Compound Interest Guide
Inflation and Compound Interest: Why Real Growth Matters
Learn why inflation can reduce purchasing power even when your balance grows over time.
In this guide
A bigger balance is not always more purchasing power Nominal vs real return Use conservative assumptionsA bigger balance is not always more purchasing power
Compound interest can increase the number of dollars, pounds, or euros in an account. Inflation affects what that money can buy.
If prices rise over time, a future balance may not feel as large as it looks today.
Nominal vs real return
The stated growth rate is often called a nominal return. A real return adjusts for inflation and gives a clearer sense of purchasing power.
For example, if an account earns 5% and inflation is 3%, the rough real growth is closer to 2% before taxes and fees.
Use conservative assumptions
Long-term planning should leave room for inflation. This is especially important for retirement, education costs, and large future purchases.
The calculator does not automatically subtract inflation, so users should interpret results as before-inflation estimates unless they adjust the rate themselves.