Inflation-Adjusted Return

What Is an Inflation-Adjusted Return?

An inflation-adjusted return, also called a real return, shows how much an investment has grown after removing the effect of rising prices. A nominal return is the raw percentage gain shown on a statement. An inflation-adjusted return tells you how much that gain is worth in terms of what your money can actually buy.

Inflation erodes purchasing power over time. A portfolio that rises 5% in a year when prices also rise 5% has not made its owner any richer in real terms. Adjusting for inflation puts returns from different years, or different investments, on a comparable footing.

How It Is Calculated

The simplest version subtracts the inflation rate from the nominal return:

Real return = nominal return - inflation rate

A more precise version divides growth factors:

Real return = (1 + nominal return) / (1 + inflation rate) - 1

Inflation is usually measured with a price index such as the Consumer Price Index (CPI). When inflation is low, the two methods give similar answers. They diverge as the numbers grow larger, and results can also vary slightly depending on which price index is used.

An Example

Suppose an investment gains 8% over a year while prices rise 3%. The simple method gives a real return of about 5%. The precise method gives (1.08 / 1.03) - 1, or about 4.85%. Either way, the investor's money grew by less in real terms than the headline 8% suggests.

Why It Matters to Investors

Inflation-adjusted returns help investors judge whether savings are keeping pace with living costs and compare long-term results across periods with very different price levels. Many investors look at real figures alongside total return measures, which include dividends and interest. Real returns can also be negative. When inflation exceeds the nominal gain, an account balance can rise while its buying power falls. The concept of a real interest rate applies the same idea to bonds and loans, so it is central to understanding fixed-income investments as well.