What Is the Real Rate of Return?

The real rate of return is the annual return on an investment after adjusting for inflation. It measures how much your purchasing power actually increases, rather than just the nominal dollar amount. A 7% nominal return during a 3% inflation period yields a real return of approximately 3.88% — meaning your actual purchasing power grew by less than half the nominal rate.

Real Rate = ((1 + Nominal) / (1 + Inflation)) − 1

Fisher Equation (exact formula)

The simpler approximation (Nominal − Inflation) works well for low rates but becomes less accurate as rates increase. For example, at 20% nominal and 15% inflation, the approximate real rate is 5%, but the exact Fisher Equation gives 4.35%.

Why This Matters for Investors

  • •Savings accounts: If your savings account pays 1% and inflation is 3%, your real return is −1.94%. You are losing purchasing power.
  • •Bonds: A 4% bond during 5% inflation has a negative real return. Inflation-protected bonds (TIPS) solve this problem.
  • •Retirement planning: Always use real rates of return when projecting retirement income needs, as inflation will erode fixed income over decades.